feat: introduce okhttp client (#44)

pom.xml

@@ -81,6 +81,11 @@
             <version>2.13.0</version>
         </dependency>
         <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>4.9.2</version>
+        </dependency>
+        <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
             <version>4.13.2</version>

src/main/java/io/github/doocs/im/constant/CommonErrorCode.java → src/main/java/io/github/doocs/im/constant/ErrorCode.java

@@ -6,7 +6,7 @@ package io.github.doocs.im.constant;
  * @author bingo
  * @since 2021/10/30 9:54
  */
-public enum CommonErrorCode {
+public enum ErrorCode {
     /**
      * REST API 公共错误码：https://cloud.tencent.com/document/product/269/1519
      */
@@ -34,7 +34,7 @@ public enum CommonErrorCode {
     ILLEGAL_IP_REST_API(60021, "RestAPI 调用来源 IP 非法"),
     ;
 
-    CommonErrorCode(Integer code, String info) {
+    ErrorCode(Integer code, String info) {
         this.code = code;
         this.info = info;
     }

src/main/java/io/github/doocs/im/core/Account.java

@@ -4,7 +4,6 @@ import io.github.doocs.im.IMClient;
 import io.github.doocs.im.model.request.*;
 import io.github.doocs.im.model.response.*;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -31,37 +30,31 @@ public class Account {
 
     public AccountImportResult accountImport(AccountImportRequest accountImportRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, ACCOUNT_IMPORT_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(accountImportRequest), null);
-        return JsonUtil.str2Obj(result, AccountImportResult.class);
+        return HttpUtil.post(url, accountImportRequest, AccountImportResult.class);
     }
 
     public MultiAccountImportResult multiAccountImport(MultiAccountImportRequest multiAccountImportRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, MULTI_ACCOUNT_IMPORT_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(multiAccountImportRequest), null);
-        return JsonUtil.str2Obj(result, MultiAccountImportResult.class);
+        return HttpUtil.post(url, multiAccountImportRequest, MultiAccountImportResult.class);
     }
 
     public AccountDeleteResult accountDelete(AccountDeleteRequest accountDeleteRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, ACCOUNT_DELETE_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(accountDeleteRequest), null);
-        return JsonUtil.str2Obj(result, AccountDeleteResult.class);
+        return HttpUtil.post(url, accountDeleteRequest, AccountDeleteResult.class);
     }
 
     public AccountCheckResult accountCheck(AccountCheckRequest accountCheckRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, ACCOUNT_CHECK_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(accountCheckRequest), null);
-        return JsonUtil.str2Obj(result, AccountCheckResult.class);
+        return HttpUtil.post(url, accountCheckRequest, AccountCheckResult.class);
     }
 
     public KickResult kick(KickRequest kickRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, KICK_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(kickRequest), null);
-        return JsonUtil.str2Obj(result, KickResult.class);
+        return HttpUtil.post(url, kickRequest, KickResult.class);
     }
 
     public QueryStateResult queryState(QueryStateRequest queryStateRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME_OPEN_IM, QUERY_STATE_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(queryStateRequest), null);
-        return JsonUtil.str2Obj(result, QueryStateResult.class);
+        return HttpUtil.post(url, queryStateRequest, QueryStateResult.class);
     }
 }

src/main/java/io/github/doocs/im/core/Group.java

@@ -4,7 +4,6 @@ import io.github.doocs.im.IMClient;
 import io.github.doocs.im.model.request.*;
 import io.github.doocs.im.model.response.*;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -48,146 +47,122 @@ public class Group {
 
     public GetAppidGroupListResult getAppIdGroupList(GetAppidGroupListRequest getAppidGroupListRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_APPID_GROUP_LIST_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getAppidGroupListRequest), null);
-        return JsonUtil.str2Obj(result, GetAppidGroupListResult.class);
+        return HttpUtil.post(url, getAppidGroupListRequest, GetAppidGroupListResult.class);
     }
 
     public CreateGroupResult createGroup(CreateGroupRequest createGroupRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, CREATE_GROUP_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(createGroupRequest), null);
-        return JsonUtil.str2Obj(result, CreateGroupResult.class);
+        return HttpUtil.post(url, createGroupRequest, CreateGroupResult.class);
     }
 
     public GetGroupInfoResult getGroupInfo(GetGroupInfoRequest getGroupInfoRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_GROUP_INFO_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getGroupInfoRequest), null);
-        return JsonUtil.str2Obj(result, GetGroupInfoResult.class);
+        return HttpUtil.post(url, getGroupInfoRequest, GetGroupInfoResult.class);
     }
 
     public GetGroupMemberInfoResult getGroupMemberInfo(GetGroupMemberInfoRequest getGroupMemberInfoRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_GROUP_MEMBER_INFO_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getGroupMemberInfoRequest), null);
-        return JsonUtil.str2Obj(result, GetGroupMemberInfoResult.class);
+        return HttpUtil.post(url, getGroupMemberInfoRequest, GetGroupMemberInfoResult.class);
     }
 
     public ModifyGroupBaseInfoResult modifyGroupBaseInfo(ModifyGroupBaseInfoRequest modifyGroupBaseInfoRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, MODIFY_GROUP_BASE_INFO_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(modifyGroupBaseInfoRequest), null);
-        return JsonUtil.str2Obj(result, ModifyGroupBaseInfoResult.class);
+        return HttpUtil.post(url, modifyGroupBaseInfoRequest, ModifyGroupBaseInfoResult.class);
     }
 
 
     public AddGroupMemberResult addGroupMember(AddGroupMemberRequest addGroupMemberRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, ADD_GROUP_MEMBER_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(addGroupMemberRequest), null);
-        return JsonUtil.str2Obj(result, AddGroupMemberResult.class);
+        return HttpUtil.post(url, addGroupMemberRequest, AddGroupMemberResult.class);
     }
 
     public DeleteGroupMemberResult deleteGroupMember(DeleteGroupMemberRequest deleteGroupMemberRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, DELETE_GROUP_MEMBER_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(deleteGroupMemberRequest), null);
-        return JsonUtil.str2Obj(result, DeleteGroupMemberResult.class);
+        return HttpUtil.post(url, deleteGroupMemberRequest, DeleteGroupMemberResult.class);
     }
 
     public ModifyGroupMemberInfoResult modifyGroupMemberInfo(ModifyGroupMemberInfoRequest modifyGroupMemberInfoRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, MODIFY_GROUP_MEMBER_INFO_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(modifyGroupMemberInfoRequest), null);
-        return JsonUtil.str2Obj(result, ModifyGroupMemberInfoResult.class);
+        return HttpUtil.post(url, modifyGroupMemberInfoRequest, ModifyGroupMemberInfoResult.class);
     }
 
     public DestroyGroupResult destroyGroup(DestroyGroupRequest destroyGroupRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, DESTROY_GROUP_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(destroyGroupRequest), null);
-        return JsonUtil.str2Obj(result, DestroyGroupResult.class);
+        return HttpUtil.post(url, destroyGroupRequest, DestroyGroupResult.class);
     }
 
     public GetJoinGroupListResult getJoinGroupList(GetJoinedGroupListRequest getJoinedGroupListRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_JOINED_GROUP_LIST_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getJoinedGroupListRequest), null);
-        return JsonUtil.str2Obj(result, GetJoinGroupListResult.class);
+        return HttpUtil.post(url, getJoinedGroupListRequest, GetJoinGroupListResult.class);
     }
 
     public GetRoleInGroupResult getRoleInGroup(GetRoleInGroupRequest getRoleInGroupRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_ROLE_IN_GROUP_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getRoleInGroupRequest), null);
-        return JsonUtil.str2Obj(result, GetRoleInGroupResult.class);
+        return HttpUtil.post(url, getRoleInGroupRequest, GetRoleInGroupResult.class);
     }
 
     public ForbidSendMsgResult forbidSendMsg(ForbidSendMsgRequest forbidSendMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FORBID_SEND_MSG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(forbidSendMsgRequest), null);
-        return JsonUtil.str2Obj(result, ForbidSendMsgResult.class);
+        return HttpUtil.post(url, forbidSendMsgRequest, ForbidSendMsgResult.class);
     }
 
     public GetGroupShuttedUinResult getGroupShuttedUin(GetGroupShuttedUinRequest getGroupShuttedUinRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_GROUP_SHUTTED_UIN_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getGroupShuttedUinRequest), null);
-        return JsonUtil.str2Obj(result, GetGroupShuttedUinResult.class);
+        return HttpUtil.post(url, getGroupShuttedUinRequest, GetGroupShuttedUinResult.class);
     }
 
     public SendGroupMsgResult sendGroupMsg(SendGroupMsgRequest sendGroupMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, SEND_GROUP_MSG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(sendGroupMsgRequest), null);
-        return JsonUtil.str2Obj(result, SendGroupMsgResult.class);
+        return HttpUtil.post(url, sendGroupMsgRequest, SendGroupMsgResult.class);
     }
 
     public SendGroupSystemNotificationResult sendGroupSystemNotification(SendGroupSystemNotificationRequest sendGroupSystemNotificationRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, SEND_GROUP_SYSTEM_NOTIFICATION_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(sendGroupSystemNotificationRequest), null);
-        return JsonUtil.str2Obj(result, SendGroupSystemNotificationResult.class);
+        return HttpUtil.post(url, sendGroupSystemNotificationRequest, SendGroupSystemNotificationResult.class);
     }
 
     public ChangeGroupOwnerResult changeGroupOwner(ChangeGroupOwnerRequest changeGroupOwnerRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, CHANGE_GROUP_OWNER_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(changeGroupOwnerRequest), null);
-        return JsonUtil.str2Obj(result, ChangeGroupOwnerResult.class);
+        return HttpUtil.post(url, changeGroupOwnerRequest, ChangeGroupOwnerResult.class);
     }
 
     public GroupMsgRecallResult groupMsgRecall(GroupMsgRecallRequest groupMsgRecallRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GROUP_MSG_RECALL_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(groupMsgRecallRequest), null);
-        return JsonUtil.str2Obj(result, GroupMsgRecallResult.class);
+        return HttpUtil.post(url, groupMsgRecallRequest, GroupMsgRecallResult.class);
     }
 
     public ImportGroupResult importGroup(ImportGroupRequest importGroupRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IMPORT_GROUP_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(importGroupRequest), null);
-        return JsonUtil.str2Obj(result, ImportGroupResult.class);
+        return HttpUtil.post(url, importGroupRequest, ImportGroupResult.class);
     }
 
     public ImportGroupMsgResult importGroupMsg(ImportGroupMsgRequest importGroupMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IMPORT_GROUP_MSG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(importGroupMsgRequest), null);
-        return JsonUtil.str2Obj(result, ImportGroupMsgResult.class);
+        return HttpUtil.post(url, importGroupMsgRequest, ImportGroupMsgResult.class);
     }
 
     public ImportGroupMemberResult importGroupMember(ImportGroupMemberRequest importGroupMemberRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IMPORT_GROUP_MEMBER_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(importGroupMemberRequest), null);
-        return JsonUtil.str2Obj(result, ImportGroupMemberResult.class);
+        return HttpUtil.post(url, importGroupMemberRequest, ImportGroupMemberResult.class);
     }
 
     public SetUnreadMsgNumResult setUnreadMsgNum(SetUnreadMsgNumRequest setUnreadMsgNumRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, SET_UNREAD_MSG_NUM_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(setUnreadMsgNumRequest), null);
-        return JsonUtil.str2Obj(result, SetUnreadMsgNumResult.class);
+        return HttpUtil.post(url, setUnreadMsgNumRequest, SetUnreadMsgNumResult.class);
     }
 
     public DeleteGroupMsgBySenderResult deleteGroupMsgBySender(DeleteGroupMsgBySenderRequest deleteGroupMsgBySenderRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, DELETE_GROUP_MSG_BY_SENDER_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(deleteGroupMsgBySenderRequest), null);
-        return JsonUtil.str2Obj(result, DeleteGroupMsgBySenderResult.class);
+        return HttpUtil.post(url, deleteGroupMsgBySenderRequest, DeleteGroupMsgBySenderResult.class);
     }
 
     public GroupMsgGetSimpleResult groupMsgGetSimple(GroupMsgGetSimpleRequest groupMsgGetSimpleRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GROUP_MSG_GET_SIMPLE_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(groupMsgGetSimpleRequest), null);
-        return JsonUtil.str2Obj(result, GroupMsgGetSimpleResult.class);
+        return HttpUtil.post(url, groupMsgGetSimpleRequest, GroupMsgGetSimpleResult.class);
     }
 
     public GetOnlineMemberNumResult getOnlineMemberNum(GetOnlineMemberNumRequest getOnlineMemberNumRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_ONLINE_MEMBER_NUM_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getOnlineMemberNumRequest), null);
-        return JsonUtil.str2Obj(result, GetOnlineMemberNumResult.class);
+        return HttpUtil.post(url, getOnlineMemberNumRequest, GetOnlineMemberNumResult.class);
     }
 }

src/main/java/io/github/doocs/im/core/Member.java

@@ -4,7 +4,6 @@ import io.github.doocs.im.IMClient;
 import io.github.doocs.im.model.request.*;
 import io.github.doocs.im.model.response.*;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -34,61 +33,51 @@ public class Member {
 
     public IMPushResult imPush(IMPushRequest imPushRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_PUSH_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imPushRequest), null);
-        return JsonUtil.str2Obj(result, IMPushResult.class);
+        return HttpUtil.post(url, imPushRequest, IMPushResult.class);
     }
 
     public IMSetAttrNameResult imSetAttrName(IMSetAttrNameRequest imSetAttrNameRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_SET_ATTR_NAME_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imSetAttrNameRequest), null);
-        return JsonUtil.str2Obj(result, IMSetAttrNameResult.class);
+        return HttpUtil.post(url, imSetAttrNameRequest, IMSetAttrNameResult.class);
     }
 
     public IMGetAttrNameResult imGetAttrName(IMGetAttrNameRequest imGetAttrNameRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_GET_ATTR_NAME_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imGetAttrNameRequest), null);
-        return JsonUtil.str2Obj(result, IMGetAttrNameResult.class);
+        return HttpUtil.post(url, imGetAttrNameRequest, IMGetAttrNameResult.class);
     }
 
     public IMGetAttrResult imGetAttr(IMGetAttrRequest imGetAttrRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_GET_ATTR_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imGetAttrRequest), null);
-        return JsonUtil.str2Obj(result, IMGetAttrResult.class);
+        return HttpUtil.post(url, imGetAttrRequest, IMGetAttrResult.class);
     }
 
     public IMSetAttrResult imSetAttr(IMSetAttrRequest imSetAttrRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_SET_ATTR_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imSetAttrRequest), null);
-        return JsonUtil.str2Obj(result, IMSetAttrResult.class);
+        return HttpUtil.post(url, imSetAttrRequest, IMSetAttrResult.class);
     }
 
     public IMRemoveAttrResult imRemoveAttr(IMRemoveAttrRequest imRemoveAttrRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_REMOVE_ATTR_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imRemoveAttrRequest), null);
-        return JsonUtil.str2Obj(result, IMRemoveAttrResult.class);
+        return HttpUtil.post(url, imRemoveAttrRequest, IMRemoveAttrResult.class);
     }
 
     public IMGetTagResult imGetTag(IMGetTagRequest imGetTagRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_GET_TAG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imGetTagRequest), null);
-        return JsonUtil.str2Obj(result, IMGetTagResult.class);
+        return HttpUtil.post(url, imGetTagRequest, IMGetTagResult.class);
     }
 
     public IMAddTagResult imAddTag(IMAddTagRequest imAddTagRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_ADD_TAG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imAddTagRequest), null);
-        return JsonUtil.str2Obj(result, IMAddTagResult.class);
+        return HttpUtil.post(url, imAddTagRequest, IMAddTagResult.class);
     }
 
     public IMRemoveTagResult imRemoveTag(IMRemoveTagRequest imRemoveTagRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_REMOVE_TAG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imRemoveTagRequest), null);
-        return JsonUtil.str2Obj(result, IMRemoveTagResult.class);
+        return HttpUtil.post(url, imRemoveTagRequest, IMRemoveTagResult.class);
     }
 
     public IMRemoveAllTagsResult imRemoveAllTags(IMRemoveAllTagsRequest imRemoveAllTagsRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IM_REMOVE_ALL_TAGS_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(imRemoveAllTagsRequest), null);
-        return JsonUtil.str2Obj(result, IMRemoveAllTagsResult.class);
+        return HttpUtil.post(url, imRemoveAllTagsRequest, IMRemoveAllTagsResult.class);
     }
 }

src/main/java/io/github/doocs/im/core/Message.java

@@ -4,7 +4,6 @@ import io.github.doocs.im.IMClient;
 import io.github.doocs.im.model.request.*;
 import io.github.doocs.im.model.response.*;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -31,43 +30,36 @@ public class Message {
 
     public SendMsgResult sendMsg(SendMsgRequest sendMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, SEND_MSG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(sendMsgRequest), null);
-        return JsonUtil.str2Obj(result, SendMsgResult.class);
+        return HttpUtil.post(url, sendMsgRequest, SendMsgResult.class);
     }
 
     public BatchSendMsgResult batchSendMsg(BatchSendMsgRequest batchSendMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, BATCH_SEND_MSG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(batchSendMsgRequest), null);
-        return JsonUtil.str2Obj(result, BatchSendMsgResult.class);
+        return HttpUtil.post(url, batchSendMsgRequest, BatchSendMsgResult.class);
     }
 
     public ImportMsgResult importMsg(ImportMsgRequest importMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, IMPORT_MSG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(importMsgRequest), null);
-        return JsonUtil.str2Obj(result, ImportMsgResult.class);
+        return HttpUtil.post(url, importMsgRequest, ImportMsgResult.class);
     }
 
     public AdminRoamMsgResult getRoamMsg(AdminGetRoamMsgRequest adminGetRoamMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, ADMIN_GET_ROAM_MSG_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(adminGetRoamMsgRequest), null);
-        return JsonUtil.str2Obj(result, AdminRoamMsgResult.class);
+        return HttpUtil.post(url, adminGetRoamMsgRequest, AdminRoamMsgResult.class);
     }
 
     public AdminMsgWithdrawResult msgWithdraw(AdminMsgWithdrawRequest adminMsgWithdrawRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, ADMIN_MSG_WITHDRAW_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(adminMsgWithdrawRequest), null);
-        return JsonUtil.str2Obj(result, AdminMsgWithdrawResult.class);
+        return HttpUtil.post(url, adminMsgWithdrawRequest, AdminMsgWithdrawResult.class);
     }
 
     public AdminSetMsgReadResult setMsgRead(AdminSetMsgReadRequest adminSetMsgReadRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, ADMIN_SET_MSG_READ_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(adminSetMsgReadRequest), null);
-        return JsonUtil.str2Obj(result, AdminSetMsgReadResult.class);
+        return HttpUtil.post(url, adminSetMsgReadRequest, AdminSetMsgReadResult.class);
     }
 
-    public C2CUnreadMsgNumResult getC2CUnreadMsgNum(GetC2CUnreadMsgRequest getC2CUnreadMsgRequest) throws IOException {
+    public C2cUnreadMsgNumResult getC2cUnreadMsgRequest(GetC2cUnreadMsgRequest getC2cUnreadMsgRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_C2C_UNREAD_MSG_NUM_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getC2CUnreadMsgRequest), null);
-        return JsonUtil.str2Obj(result, C2CUnreadMsgNumResult.class);
+        return HttpUtil.post(url, getC2cUnreadMsgRequest, C2cUnreadMsgNumResult.class);
     }
 }

src/main/java/io/github/doocs/im/core/Operation.java

@@ -4,7 +4,6 @@ import io.github.doocs.im.IMClient;
 import io.github.doocs.im.model.request.*;
 import io.github.doocs.im.model.response.*;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -32,31 +31,26 @@ public class Operation {
 
     public SetNoSpeakingResult setNoSpeaking(SetNoSpeakingRequest setNoSpeakingRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME_OPEN_CONFIG, SET_NO_SPEAKING_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(setNoSpeakingRequest), null);
-        return JsonUtil.str2Obj(result, SetNoSpeakingResult.class);
+        return HttpUtil.post(url, setNoSpeakingRequest, SetNoSpeakingResult.class);
     }
 
     public GetNoSpeakingResult getNoSpeaking(GetNoSpeakingRequest getNoSpeakingRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME_OPEN_CONFIG, GET_NO_SPEAKING_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getNoSpeakingRequest), null);
-        return JsonUtil.str2Obj(result, GetNoSpeakingResult.class);
+        return HttpUtil.post(url, getNoSpeakingRequest, GetNoSpeakingResult.class);
     }
 
     public GetAppInfoResult getAppInfo(GetAppInfoRequest getAppInfoRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME_OPEN_CONFIG, GET_APP_INFO_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getAppInfoRequest), null);
-        return JsonUtil.str2Obj(result, GetAppInfoResult.class);
+        return HttpUtil.post(url, getAppInfoRequest, GetAppInfoResult.class);
     }
 
     public GetHistoryResult getHistory(GetHistoryRequest getHistoryRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME_OPEN_MSG, GET_HISTORY_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getHistoryRequest), null);
-        return JsonUtil.str2Obj(result, GetHistoryResult.class);
+        return HttpUtil.post(url, getHistoryRequest, GetHistoryResult.class);
     }
 
     public GetIpListResult getIpList(GetIpListRequest getIpListRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME_CONFIG, GET_IP_LIST_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(getIpListRequest), null);
-        return JsonUtil.str2Obj(result, GetIpListResult.class);
+        return HttpUtil.post(url, getIpListRequest, GetIpListResult.class);
     }
 }

src/main/java/io/github/doocs/im/core/Profile.java

@@ -6,7 +6,6 @@ import io.github.doocs.im.model.request.PortraitSetRequest;
 import io.github.doocs.im.model.response.PortraitGetResult;
 import io.github.doocs.im.model.response.PortraitSetResult;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -28,13 +27,11 @@ public class Profile {
 
     public PortraitSetResult portraitSet(PortraitSetRequest portraitSetRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, PORTRAIT_SET_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(portraitSetRequest), null);
-        return JsonUtil.str2Obj(result, PortraitSetResult.class);
+        return HttpUtil.post(url, portraitSetRequest, PortraitSetResult.class);
     }
 
     public PortraitGetResult portraitGet(PortraitGetRequest portraitGetRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, PORTRAIT_GET_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(portraitGetRequest), null);
-        return JsonUtil.str2Obj(result, PortraitGetResult.class);
+        return HttpUtil.post(url, portraitGetRequest, PortraitGetResult.class);
     }
 }

src/main/java/io/github/doocs/im/core/RecentContact.java

@@ -6,7 +6,6 @@ import io.github.doocs.im.model.request.GetRecentContactListRequest;
 import io.github.doocs.im.model.response.DeleteRecentContactResult;
 import io.github.doocs.im.model.response.GetRecentContactListResult;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -28,13 +27,11 @@ public class RecentContact {
 
     public GetRecentContactListResult recentContactList(GetRecentContactListRequest recentContactListRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GET_RECENT_CONTACT_LIST);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(recentContactListRequest), null);
-        return JsonUtil.str2Obj(result, GetRecentContactListResult.class);
+        return HttpUtil.post(url, recentContactListRequest, GetRecentContactListResult.class);
     }
 
     public DeleteRecentContactResult deleteRecentContact(DeleteRecentContactRequest deleteRecentContactRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, DELETE_RECENT_CONTACT);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(deleteRecentContactRequest), null);
-        return JsonUtil.str2Obj(result, DeleteRecentContactResult.class);
+        return HttpUtil.post(url, deleteRecentContactRequest, DeleteRecentContactResult.class);
     }
 }

src/main/java/io/github/doocs/im/core/SNS.java

@@ -4,7 +4,6 @@ import io.github.doocs.im.IMClient;
 import io.github.doocs.im.model.request.*;
 import io.github.doocs.im.model.response.*;
 import io.github.doocs.im.util.HttpUtil;
-import io.github.doocs.im.util.JsonUtil;
 
 import java.io.IOException;
 
@@ -39,91 +38,76 @@ public class SNS {
 
     public FriendAddResult friendAdd(FriendAddRequest friendAddRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_ADD_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendAddRequest), null);
-        return JsonUtil.str2Obj(result, FriendAddResult.class);
+        return HttpUtil.post(url, friendAddRequest, FriendAddResult.class);
     }
 
     public FriendImportResult friendImport(FriendImportRequest friendImportRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_IMPORT_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendImportRequest), null);
-        return JsonUtil.str2Obj(result, FriendImportResult.class);
+        return HttpUtil.post(url, friendImportRequest, FriendImportResult.class);
     }
 
     public FriendUpdateResult friendUpdate(FriendUpdateRequest friendUpdateRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_UPDATE_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendUpdateRequest), null);
-        return JsonUtil.str2Obj(result, FriendUpdateResult.class);
+        return HttpUtil.post(url, friendUpdateRequest, FriendUpdateResult.class);
     }
 
     public FriendDeleteResult friendDelete(FriendDeleteRequest friendDeleteRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_DELETE_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendDeleteRequest), null);
-        return JsonUtil.str2Obj(result, FriendDeleteResult.class);
+        return HttpUtil.post(url, friendDeleteRequest, FriendDeleteResult.class);
     }
 
     public FriendDeleteAllResult friendDeleteAll(FriendDeleteAllRequest friendDeleteAllRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_DELETE_ALL_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendDeleteAllRequest), null);
-        return JsonUtil.str2Obj(result, FriendDeleteAllResult.class);
+        return HttpUtil.post(url, friendDeleteAllRequest, FriendDeleteAllResult.class);
     }
 
     public FriendCheckResult friendCheck(FriendCheckRequest friendCheckRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_CHECK_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendCheckRequest), null);
-        return JsonUtil.str2Obj(result, FriendCheckResult.class);
+        return HttpUtil.post(url, friendCheckRequest, FriendCheckResult.class);
     }
 
     public FriendGetResult friendGet(FriendGetRequest friendGetRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_GET_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendGetRequest), null);
-        return JsonUtil.str2Obj(result, FriendGetResult.class);
+        return HttpUtil.post(url, friendGetRequest, FriendGetResult.class);
     }
 
     public FriendGetListResult friendGetList(FriendGetListRequest friendGetListRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, FRIEND_GET_LIST_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(friendGetListRequest), null);
-        return JsonUtil.str2Obj(result, FriendGetListResult.class);
+        return HttpUtil.post(url, friendGetListRequest, FriendGetListResult.class);
     }
 
     public BlackListAddResult blackListAdd(BlackListAddRequest blackListAddRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, BLACK_LIST_ADD_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(blackListAddRequest), null);
-        return JsonUtil.str2Obj(result, BlackListAddResult.class);
+        return HttpUtil.post(url, blackListAddRequest, BlackListAddResult.class);
     }
 
     public BlackListDeleteResult blackListDelete(BlackListDeleteRequest blackListDeleteRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, BLACK_LIST_DELETE_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(blackListDeleteRequest), null);
-        return JsonUtil.str2Obj(result, BlackListDeleteResult.class);
+        return HttpUtil.post(url, blackListDeleteRequest, BlackListDeleteResult.class);
     }
 
     public BlackListGetResult blackListGet(BlackListGetRequest blackListGetRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, BLACK_LIST_GET_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(blackListGetRequest), null);
-        return JsonUtil.str2Obj(result, BlackListGetResult.class);
+        return HttpUtil.post(url, blackListGetRequest, BlackListGetResult.class);
     }
 
     public BlackListCheckResult blackListCheck(BlackListCheckRequest blackListCheckRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, BLACK_LIST_CHECK_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(blackListCheckRequest), null);
-        return JsonUtil.str2Obj(result, BlackListCheckResult.class);
+        return HttpUtil.post(url, blackListCheckRequest, BlackListCheckResult.class);
     }
 
     public GroupAddResult groupAdd(GroupAddRequest groupAddRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GROUP_ADD_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(groupAddRequest), null);
-        return JsonUtil.str2Obj(result, GroupAddResult.class);
+        return HttpUtil.post(url, groupAddRequest, GroupAddResult.class);
     }
 
     public GroupDeleteResult groupDelete(GroupDeleteRequest groupDeleteRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GROUP_DELETE_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(groupDeleteRequest), null);
-        return JsonUtil.str2Obj(result, GroupDeleteResult.class);
+        return HttpUtil.post(url, groupDeleteRequest, GroupDeleteResult.class);
     }
 
     public GroupGetResult groupGet(GroupGetRequest groupGetRequest) throws IOException {
         String url = imClient.getUrl(SERVICE_NAME, GROUP_GET_COMMAND);
-        String result = HttpUtil.post(url, JsonUtil.obj2Str(groupGetRequest), null);
-        return JsonUtil.str2Obj(result, GroupGetResult.class);
+        return HttpUtil.post(url, groupGetRequest, GroupGetResult.class);
     }
 }

src/main/java/io/github/doocs/im/model/request/GetC2CUnreadMsgRequest.java → src/main/java/io/github/doocs/im/model/request/GetC2cUnreadMsgRequest.java

@@ -10,18 +10,18 @@ import java.util.List;
  * @since 2021/7/31 15:37
  */
 @JsonInclude(JsonInclude.Include.NON_NULL)
-public class GetC2CUnreadMsgRequest extends GenericRequest {
+public class GetC2cUnreadMsgRequest extends GenericRequest {
     @JsonProperty("To_Account")
     private String toAccount;
 
     @JsonProperty("Peer_Account")
     private List<String> peerAccount;
 
-    public GetC2CUnreadMsgRequest(String toAccount) {
+    public GetC2cUnreadMsgRequest(String toAccount) {
         this(toAccount, null);
     }
 
-    public GetC2CUnreadMsgRequest(String toAccount, List<String> peerAccount) {
+    public GetC2cUnreadMsgRequest(String toAccount, List<String> peerAccount) {
         this.toAccount = toAccount;
         this.peerAccount = peerAccount;
     }

src/main/java/io/github/doocs/im/model/response/C2CUnreadMsgNumListItem.java → src/main/java/io/github/doocs/im/model/response/C2cUnreadMsgNumListItem.java

@@ -6,7 +6,7 @@ import com.fasterxml.jackson.annotation.JsonProperty;
  * @author hyh
  * @since 2021/07/28 20:39
  */
-public class C2CUnreadMsgNumListItem {
+public class C2cUnreadMsgNumListItem {
     @JsonProperty("Peer_Account")
     private String peerAccount;
 
@@ -31,7 +31,7 @@ public class C2CUnreadMsgNumListItem {
 
     @Override
     public String toString() {
-        return "C2CUnreadMsgNumListItem{" +
+        return "C2cUnreadMsgNumListItem{" +
                 "peerAccount='" + peerAccount + '\'' +
                 ", unreadMsgNum='" + unreadMsgNum + '\'' +
                 '}';

src/main/java/io/github/doocs/im/model/response/C2CUnreadMsgNumResult.java → src/main/java/io/github/doocs/im/model/response/C2cUnreadMsgNumResult.java

@@ -8,21 +8,21 @@ import java.util.List;
  * @author hyh
  * @since 2021/07/28 20:34
  */
-public class C2CUnreadMsgNumResult extends GenericResult {
+public class C2cUnreadMsgNumResult extends GenericResult {
     @JsonProperty("C2CUnreadMsgNumList")
-    private List<C2CUnreadMsgNumListItem> unreadMsgNumList;
+    private List<C2cUnreadMsgNumListItem> unreadMsgNumList;
 
-    public List<C2CUnreadMsgNumListItem> getUnreadMsgNumList() {
+    public List<C2cUnreadMsgNumListItem> getUnreadMsgNumList() {
         return unreadMsgNumList;
     }
 
-    public void setUnreadMsgNumList(List<C2CUnreadMsgNumListItem> unreadMsgNumList) {
+    public void setUnreadMsgNumList(List<C2cUnreadMsgNumListItem> unreadMsgNumList) {
         this.unreadMsgNumList = unreadMsgNumList;
     }
 
     @Override
     public String toString() {
-        return "C2CUnreadMsgNumResult{" +
+        return "C2cUnreadMsgNumResult{" +
                 "unreadMsgNumList=" + unreadMsgNumList +
                 '}';
     }

src/main/java/io/github/doocs/im/util/HttpUtil.java

 package io.github.doocs.im.util;
 
-import java.io.*;
-import java.net.HttpURLConnection;
-import java.net.URL;
-import java.net.URLDecoder;
-import java.net.URLEncoder;
-import java.nio.charset.StandardCharsets;
-import java.util.HashMap;
-import java.util.Map;
+import okhttp3.*;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.concurrent.TimeUnit;
 
 /**
- * Http tool
- *
  * @author bingo
- * @since 2021/7/28 14:55
+ * @since 2021/10/31 15:57
  */
 public class HttpUtil {
-    private static final String UTF_8 = StandardCharsets.UTF_8.name();
-
-    private HttpUtil() {
-    }
-
-    /**
-     * Send a get request
-     *
-     * @param url Url as string
-     * @return response
-     * @throws IOException IOException
-     */
-    public static String get(String url) throws IOException {
-        return get(url, null);
-    }
-
-    /**
-     * Send a get request
-     *
-     * @param url     Url as string
-     * @param headers Optional map with headers
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String get(String url,
-                             Map<String, String> headers) throws IOException {
-        return fetch("GET", url, null, headers);
-    }
-
-    /**
-     * Send a post request
-     *
-     * @param url     Url as string
-     * @param body    Request body as string
-     * @param headers Optional map with headers
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String post(String url, String body,
-                              Map<String, String> headers) throws IOException {
-        return fetch("POST", url, body, headers);
-    }
-
-    /**
-     * Send a post request
-     *
-     * @param url  Url as string
-     * @param body Request body as string
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String post(String url, String body) throws IOException {
-        return post(url, body, null);
-    }
+    private static final MediaType JSON = MediaType.get("application/json; charset=utf-8");
 
-    /**
-     * Post a json string
-     *
-     * @param url     Url as string
-     * @param jsonStr a json string
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String postJson(String url, String jsonStr) throws IOException {
-        Map<String, String> headers = new HashMap<>();
-        headers.put("Content-Type", "application/json;charset=UTF-8");
-        return post(url, jsonStr, headers);
-    }
-
-    /**
-     * Post a form with parameters
-     *
-     * @param url    Url as string
-     * @param params map with parameters/values
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String postForm(String url, Map<String, String> params)
-            throws IOException {
-        return postForm(url, params, null);
-    }
-
-    /**
-     * Post a form with parameters
-     *
-     * @param url     Url as string
-     * @param params  Map with parameters/values
-     * @param headers Optional map with headers
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String postForm(String url, Map<String, String> params,
-                                  Map<String, String> headers) throws IOException {
-        // set content type
-        if (headers == null) {
-            headers = new HashMap<>(2);
-        }
-        headers.put("Content-Type", "application/x-www-form-urlencoded");
-
-        // parse parameters
-        StringBuilder body = new StringBuilder();
-        if (params != null) {
-            boolean first = true;
-            for (String param : params.keySet()) {
-                if (first) {
-                    first = false;
-                } else {
-                    body.append("&");
-                }
-                String value = params.get(param);
-                body.append(URLEncoder.encode(param, UTF_8)).append("=");
-                body.append(URLEncoder.encode(value, UTF_8));
-            }
-        }
-
-        return post(url, body.toString(), headers);
-    }
-
-    /**
-     * Send a put request
-     *
-     * @param url     Url as string
-     * @param body    Request body as string
-     * @param headers Optional map with headers
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String put(String url, String body,
-                             Map<String, String> headers) throws IOException {
-        return fetch("PUT", url, body, headers);
-    }
+    private static final OkHttpClient DEFAULT_CLIENT = new OkHttpClient.Builder()
+            .retryOnConnectionFailure(true)
+            .connectTimeout(1000, TimeUnit.MICROSECONDS)
+            .readTimeout(1000, TimeUnit.MILLISECONDS)
+            .writeTimeout(1000, TimeUnit.MILLISECONDS)
+            .build();
 
-    /**
-     * Send a put request
-     *
-     * @param url Url as string
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String put(String url, String body) throws IOException {
-        return put(url, body, null);
-    }
-
-    /**
-     * Send a delete request
-     *
-     * @param url     Url as string
-     * @param headers Optional map with headers
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String delete(String url,
-                                Map<String, String> headers) throws IOException {
-        return fetch("DELETE", url, null, headers);
-    }
-
-    /**
-     * Send a delete request
-     *
-     * @param url Url as string
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String delete(String url) throws IOException {
-        return delete(url, null);
-    }
-
-    /**
-     * Append query parameters to given url
-     *
-     * @param url    Url as string
-     * @param params Map with query parameters
-     * @return url        Url with query parameters appended
-     * @throws IOException IOException
-     */
-    public static String appendQueryParams(String url,
-                                           Map<String, String> params) throws IOException {
-        StringBuilder fullUrl = new StringBuilder(url);
-        if (params != null) {
-            boolean first = (fullUrl.toString().indexOf('?') == -1);
-            for (Map.Entry<String, String> entry : params.entrySet()) {
-                if (first) {
-                    fullUrl.append('?');
-                    first = false;
-                } else {
-                    fullUrl.append('&');
-                }
-                String param = entry.getKey();
-                String value = entry.getValue();
-                fullUrl.append(URLEncoder.encode(param, UTF_8)).append('=');
-                fullUrl.append(URLEncoder.encode(value, UTF_8));
-            }
-        }
-        return fullUrl.toString();
-    }
-
-    /**
-     * Retrieve the query parameters from given url
-     *
-     * @param url Url containing query parameters
-     * @return params     Map with query parameters
-     * @throws IOException IOException
-     */
-    public static Map<String, String> getQueryParams(String url)
-            throws IOException {
-        Map<String, String> params = new HashMap<>(16);
-
-        int start = url.indexOf('?');
-        while (start != -1) {
-            // read parameter name
-            int equals = url.indexOf('=', start);
-            String param = equals == -1 ? url.substring(start + 1) : url.substring(start + 1, equals);
-
-            // read parameter value
-            String value = "";
-            if (equals != -1) {
-                start = url.indexOf('&', equals);
-                value = start == -1 ? url.substring(equals + 1) : url.substring(equals + 1, start);
-            }
-
-            params.put(URLDecoder.decode(param, UTF_8),
-                    URLDecoder.decode(value, UTF_8));
-        }
-
-        return params;
-    }
-
-    /**
-     * Returns the url without query parameters
-     *
-     * @param url Url containing query parameters
-     * @return url        Url without query parameters
-     */
-    public static String removeQueryParams(String url) {
-        int q = url.indexOf('?');
-        return q == -1 ? url : url.substring(0, q);
-    }
-
-    /**
-     * Send a request
-     *
-     * @param method  HTTP method, for example "GET" or "POST"
-     * @param url     Url as string
-     * @param body    Request body as string
-     * @param headers Optional map with headers
-     * @return response   Response as string
-     * @throws IOException IOException
-     */
-    public static String fetch(String method, String url, String body,
-                               Map<String, String> headers) throws IOException {
-        // connection
-        URL u = new URL(url);
-        HttpURLConnection conn = (HttpURLConnection) u.openConnection();
-        conn.setConnectTimeout(120000);
-        conn.setReadTimeout(120000);
+    private HttpUtil() {
 
-        // method
-        if (method != null) {
-            conn.setRequestMethod(method);
     }
 
-        // headers
-        if (headers != null) {
-            headers.forEach(conn::addRequestProperty);
+    public static String post(String url, String json) throws IOException {
+        RequestBody body = RequestBody.create(json, JSON);
+        Request request = new Request.Builder()
+                .url(url)
+                .post(body)
+                .build();
+        try (Response response = DEFAULT_CLIENT.newCall(request).execute()) {
+            return Objects.requireNonNull(response.body()).string();
         }
-
-        // body
-        if (body != null) {
-            conn.setDoOutput(true);
-            OutputStream os = conn.getOutputStream();
-            os.write(body.getBytes());
-            os.flush();
-            os.close();
     }
 
-        // response
-        InputStream is = conn.getInputStream();
-        String response = streamToString(is);
-
-        // handle redirects
-        if (conn.getResponseCode() == 301) {
-            String location = conn.getHeaderField("Location");
-            return fetch(method, location, body, headers);
+    public static String post(String url, Object data) throws IOException {
+        return post(url, JsonUtil.obj2Str(data));
     }
 
-        return response;
+    public static <T> T post(String url, Object data, Class<T> cls) throws IOException {
+        String result = post(url, JsonUtil.obj2Str(data));
+        return JsonUtil.str2Obj(result, cls);
     }
 
-    /**
-     * Read an input stream from conn into a string
-     *
-     * @param in InputStream
-     * @return InputStream as string
-     * @throws IOException IOException
-     */
-    public static String streamToString(InputStream in) throws IOException {
-        InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
-        BufferedReader br = new BufferedReader(isr);
+    public static String get(String url) throws IOException {
+        Request request = new Request.Builder()
+                .url(url)
+                .build();
 
-        String data;
-        StringBuilder out = new StringBuilder();
-        while ((data = br.readLine()) != null) {
-            out.append(data);
+        try (Response response = DEFAULT_CLIENT.newCall(request).execute()) {
+            return Objects.requireNonNull(response.body()).string();
         }
-        br.close();
-        return out.toString();
     }
 }

src/test/java/io/github/doocs/im/AccountTest.java

@@ -34,9 +34,9 @@ public class AccountTest {
 
     @Test
     public void testAccountImport() throws IOException {
-        AccountImportRequest request = new AccountImportRequest("test1");
+        AccountImportRequest request = new AccountImportRequest("user2");
         request.setFaceUrl("http://www.qq.com");
-        request.setNick("bingo");
+        request.setNick("ylb");
         AccountImportResult result = client.account.accountImport(request);
         System.out.println(result);
         Assert.assertEquals("OK", result.getActionStatus());

src/test/java/io/github/doocs/im/MessageTest.java

@@ -97,9 +97,9 @@ public class MessageTest {
 
     @Test
     public void testGetC2CUnreadMsgNum() throws IOException {
-        GetC2CUnreadMsgRequest request = new GetC2CUnreadMsgRequest("test2");
+        GetC2cUnreadMsgRequest request = new GetC2cUnreadMsgRequest("test2");
         request.setPeerAccount(Arrays.asList("test1", "bingo"));
-        C2CUnreadMsgNumResult result = client.message.getC2CUnreadMsgNum(request);
+        C2cUnreadMsgNumResult result = client.message.getC2cUnreadMsgRequest(request);
         System.out.println(result);
         Assert.assertEquals("OK", result.getActionStatus());
     }