HttpJobHandler优化，响应数据指定UTF-8格式，避免中文乱码；

doc/XXL-JOB官方文档.md

 - 15、执行器回调线程优化，回调地址为空时销毁问题修复；
 - 16、任务日志主键调整为long，防止海量日志情况下数据溢出；
 - 17、任务日志列表交互优化，操作按钮合并为分割按钮；
+- 18、HttpJobHandler优化，响应数据指定UTF-8格式，避免中文乱码；
 
 
 ### 6.26 版本 v2.1.1 Release Notes[规划中]

xxl-job-executor-samples/xxl-job-executor-sample-frameless/src/main/java/com/xuxueli/executor/sample/frameless/jobhandler/HttpJobHandler.java

 			}
 
 			// result
-			bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+			bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
 			StringBuilder result = new StringBuilder();
 			String line;
 			while ((line = bufferedReader.readLine()) != null) {

xxl-job-executor-samples/xxl-job-executor-sample-jboot/src/main/java/com/xuxueli/executor/sample/jboot/jobhandler/HttpJobHandler.java

             }
 
             // result
-            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
             StringBuilder result = new StringBuilder();
             String line;
             while ((line = bufferedReader.readLine()) != null) {

xxl-job-executor-samples/xxl-job-executor-sample-jfinal/src/main/java/com/xuxueli/executor/sample/jfinal/jobhandler/HttpJobHandler.java

             }
 
             // result
-            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
             StringBuilder result = new StringBuilder();
             String line;
             while ((line = bufferedReader.readLine()) != null) {

xxl-job-executor-samples/xxl-job-executor-sample-nutz/src/main/java/com/xuxueli/executor/sample/nutz/jobhandler/HttpJobHandler.java

             }
 
             // result
-            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
             StringBuilder result = new StringBuilder();
             String line;
             while ((line = bufferedReader.readLine()) != null) {

xxl-job-executor-samples/xxl-job-executor-sample-spring/src/main/java/com/xxl/job/executor/service/jobhandler/HttpJobHandler.java

             }
 
             // result
-            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
             StringBuilder result = new StringBuilder();
             String line;
             while ((line = bufferedReader.readLine()) != null) {

xxl-job-executor-samples/xxl-job-executor-sample-springboot/src/main/java/com/xxl/job/executor/service/jobhandler/HttpJobHandler.java

             }
 
             // result
-            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+            bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
             StringBuilder result = new StringBuilder();
             String line;
             while ((line = bufferedReader.readLine()) != null) {