ReturnT 重构，简化代码结构，提升API易用性以及可维护性；

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobGroupController.java

@@ -199,7 +199,7 @@ public class JobGroupController {
 	@PermissionLimit(adminuser = true)
 	public ReturnT<XxlJobGroup> loadById(@RequestParam("id") int id){
 		XxlJobGroup jobGroup = xxlJobGroupDao.load(id);
-		return jobGroup!=null?new ReturnT<XxlJobGroup>(jobGroup):new ReturnT<XxlJobGroup>(ReturnT.FAIL_CODE, null);
+		return jobGroup!=null?ReturnT.ofSuccess(jobGroup):ReturnT.ofFail();
 	}
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobInfoController.java

@@ -157,7 +157,7 @@ public class JobInfoController {
 			logger.error("nextTriggerTime error. scheduleType = {}, scheduleConf= {}", scheduleType, scheduleConf, e);
 			return new ReturnT<List<String>>(ReturnT.FAIL_CODE, (I18nUtil.getString("schedule_type")+I18nUtil.getString("system_unvalid")) + e.getMessage());
 		}
-		return new ReturnT<List<String>>(result);
+		return ReturnT.ofSuccess(result);
 
 	}
 	

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobLogController.java

@@ -84,7 +84,7 @@ public class JobLogController {
 	@ResponseBody
 	public ReturnT<List<XxlJobInfo>> getJobsByGroup(@RequestParam("jobGroup") int jobGroup){
 		List<XxlJobInfo> list = xxlJobInfoDao.getJobsByGroup(jobGroup);
-		return new ReturnT<List<XxlJobInfo>>(list);
+		return ReturnT.ofSuccess(list);
 	}
 	
 	@RequestMapping("/pageList")
@@ -236,9 +236,9 @@ public class JobLogController {
 			log.setHandleMsg( I18nUtil.getString("joblog_kill_log_byman")+":" + (runResult.getMsg()!=null?runResult.getMsg():""));
 			log.setHandleTime(new Date());
 			XxlJobCompleter.updateHandleInfoAndFinish(log);
-			return new ReturnT<String>(runResult.getMsg());
+			return ReturnT.ofSuccess(runResult.getMsg());
 		} else {
-			return new ReturnT<String>(500, runResult.getMsg());
+			return ReturnT.ofFail(runResult.getMsg());
 		}
 	}
 

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/strategy/ExecutorRouteConsistentHash.java

@@ -79,7 +79,7 @@ public class ExecutorRouteConsistentHash extends ExecutorRouter {
     @Override
     public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
         String address = hashJob(triggerParam.getJobId(), addressList);
-        return new ReturnT<String>(address);
+        return ReturnT.ofSuccess(address);
     }
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/strategy/ExecutorRouteFirst.java

@@ -13,7 +13,7 @@ public class ExecutorRouteFirst extends ExecutorRouter {
 
     @Override
     public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList){
-        return new ReturnT<String>(addressList.get(0));
+        return ReturnT.ofSuccess(addressList.get(0));
     }
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/strategy/ExecutorRouteLFU.java

@@ -73,7 +73,7 @@ public class ExecutorRouteLFU extends ExecutorRouter {
     @Override
     public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
         String address = route(triggerParam.getJobId(), addressList);
-        return new ReturnT<String>(address);
+        return ReturnT.ofSuccess(address);
     }
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/strategy/ExecutorRouteLRU.java

@@ -70,7 +70,7 @@ public class ExecutorRouteLRU extends ExecutorRouter {
     @Override
     public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
         String address = route(triggerParam.getJobId(), addressList);
-        return new ReturnT<String>(address);
+        return ReturnT.ofSuccess(address);
     }
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/strategy/ExecutorRouteLast.java

@@ -13,7 +13,7 @@ public class ExecutorRouteLast extends ExecutorRouter {
 
     @Override
     public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
-        return new ReturnT<String>(addressList.get(addressList.size()-1));
+        return ReturnT.ofSuccess(addressList.get(addressList.size()-1));
     }
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/strategy/ExecutorRouteRandom.java

@@ -17,7 +17,7 @@ public class ExecutorRouteRandom extends ExecutorRouter {
     @Override
     public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
         String address = addressList.get(localRandom.nextInt(addressList.size()));
-        return new ReturnT<String>(address);
+        return ReturnT.ofSuccess(address);
     }
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/route/strategy/ExecutorRouteRound.java

@@ -40,7 +40,7 @@ public class ExecutorRouteRound extends ExecutorRouter {
     @Override
     public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
         String address = addressList.get(count(triggerParam.getJobId())%addressList.size());
-        return new ReturnT<String>(address);
+        return ReturnT.ofSuccess(address);
     }
 
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/service/impl/XxlJobServiceImpl.java

@@ -162,7 +162,7 @@ public class XxlJobServiceImpl implements XxlJobService {
 			return new ReturnT<String>(ReturnT.FAIL_CODE, (I18nUtil.getString("jobinfo_field_add")+I18nUtil.getString("system_fail")) );
 		}
 
-		return new ReturnT<String>(String.valueOf(jobInfo.getId()));
+		return ReturnT.ofSuccess(String.valueOf(jobInfo.getId()));
 	}
 
 	private boolean isNumeric(String str){
@@ -494,7 +494,7 @@ public class XxlJobServiceImpl implements XxlJobService {
 		result.put("triggerCountSucTotal", triggerCountSucTotal);
 		result.put("triggerCountFailTotal", triggerCountFailTotal);
 
-		return new ReturnT<Map<String, Object>>(result);
+		return ReturnT.ofSuccess(result);
 	}
 
 }

xxl-job-core/src/main/java/com/xxl/job/core/biz/impl/ExecutorBizImpl.java

@@ -166,7 +166,7 @@ public class ExecutorBizImpl implements ExecutorBiz {
         String logFileName = XxlJobFileAppender.makeLogFileName(new Date(logParam.getLogDateTim()), logParam.getLogId());
 
         LogResult logResult = XxlJobFileAppender.readLog(logFileName, logParam.getFromLineNum());
-        return new ReturnT<LogResult>(logResult);
+        return ReturnT.ofSuccess(logResult);
     }
 
 }

xxl-job-core/src/main/java/com/xxl/job/core/biz/model/ReturnT.java

@@ -30,11 +30,6 @@ public class ReturnT<T> implements Serializable {
 		this.content = content;
 	}
 
-	public ReturnT(T content) {
-		this.code = SUCCESS_CODE;
-		this.content = content;
-	}
-	
 	public int getCode() {
 		return code;
 	}