调度中心与执行器通讯规范为双向restful，方便跨语言，以及第三方执行器实现；通讯组件xxl-rpc方案调整为Jetty+Gson方案；

xxl-job-admin/src/main/java/com/xxl/job/admin/core/trigger/XxlJobTrigger.java

 package com.xxl.job.admin.core.trigger;
 
 import com.xxl.job.admin.core.conf.XxlJobAdminConfig;
-import com.xxl.job.admin.core.scheduler.XxlJobScheduler;
 import com.xxl.job.admin.core.model.XxlJobGroup;
 import com.xxl.job.admin.core.model.XxlJobInfo;
 import com.xxl.job.admin.core.model.XxlJobLog;
 import com.xxl.job.admin.core.route.ExecutorRouteStrategyEnum;
+import com.xxl.job.admin.core.scheduler.XxlJobScheduler;
 import com.xxl.job.admin.core.util.I18nUtil;
 import com.xxl.job.core.biz.ExecutorBiz;
 import com.xxl.job.core.biz.model.ReturnT;
 import com.xxl.job.core.biz.model.TriggerParam;
 import com.xxl.job.core.enums.ExecutorBlockStrategyEnum;
 import com.xxl.job.core.util.IpUtil;
-import io.netty.util.internal.ThrowableUtil;
+import com.xxl.job.core.util.ThrowableUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -211,7 +211,7 @@ public class XxlJobTrigger {
             runResult = executorBiz.run(triggerParam);
         } catch (Exception e) {
             logger.error(">>>>>>>>>>> xxl-job trigger error, please check if the executor[{}] is running.", address, e);
-            runResult = new ReturnT<String>(ReturnT.FAIL_CODE, ThrowableUtil.stackTraceToString(e));
+            runResult = new ReturnT<String>(ReturnT.FAIL_CODE, ThrowableUtil.toString(e));
         }
 
         StringBuffer runResultSB = new StringBuffer(I18nUtil.getString("jobconf_trigger_run") + "：");

xxl-job-admin/src/main/resources/static/js/jobinfo.index.1.js

@@ -298,13 +298,13 @@ $(function() {
             dataType : "json",
             success : function(data){
 
-                var html = '<center>';
+                var html = '<div>';
                 if (data.code == 200 && data.content.registryList) {
                     for (var index in data.content.registryList) {
-                        html += '<span class="badge bg-green" >' + data.content.registryList[index] + '</span><br>';
+                        html += (parseInt(index)+1) + '. <span class="badge bg-green" >' + data.content.registryList[index] + '</span><br>';
                     }
                 }
-                html += '</center>';
+                html += '</div>';
 
                 layer.open({
                     title: I18n.jobinfo_opt_registryinfo ,

xxl-job-core/src/main/java/com/xxl/job/core/server/EmbedServer.java

@@ -7,6 +7,7 @@ import com.xxl.job.core.biz.model.ReturnT;
 import com.xxl.job.core.biz.model.TriggerParam;
 import com.xxl.job.core.thread.ExecutorRegistryThread;
 import com.xxl.job.core.util.GsonTool;
+import com.xxl.job.core.util.ThrowableUtil;
 import com.xxl.job.core.util.XxlJobRemotingUtil;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.buffer.Unpooled;
@@ -18,7 +19,6 @@ import io.netty.handler.codec.http.*;
 import io.netty.handler.timeout.IdleStateEvent;
 import io.netty.handler.timeout.IdleStateHandler;
 import io.netty.util.CharsetUtil;
-import io.netty.util.internal.ThrowableUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -185,7 +185,7 @@ public class EmbedServer {
                 }
             } catch (Exception e) {
                 logger.error(e.getMessage(), e);
-                return new ReturnT<String>(ReturnT.FAIL_CODE, "request error:" + ThrowableUtil.stackTraceToString(e));
+                return new ReturnT<String>(ReturnT.FAIL_CODE, "request error:" + ThrowableUtil.toString(e));
             }
         }
 

xxl-job-core/src/main/java/com/xxl/job/core/thread/TriggerCallbackThread.java

@@ -8,7 +8,7 @@ import com.xxl.job.core.executor.XxlJobExecutor;
 import com.xxl.job.core.log.XxlJobFileAppender;
 import com.xxl.job.core.log.XxlJobLogger;
 import com.xxl.job.core.util.FileUtil;
-import com.xxl.job.core.util.GsonTool;
+import com.xxl.job.core.util.JdkSerializeTool;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -205,7 +205,7 @@ public class TriggerCallbackThread {
         }
 
         // append file
-        String callbackParamList_Str = GsonTool.toJson(callbackParamList);
+        byte[] callbackParamList_bytes = JdkSerializeTool.serialize(callbackParamList);
 
         File callbackLogFile = new File(failCallbackFileName.replace("{x}", String.valueOf(System.currentTimeMillis())));
         if (callbackLogFile.exists()) {
@@ -216,7 +216,7 @@ public class TriggerCallbackThread {
                 }
             }
         }
-        FileUtil.writeFileContent(callbackLogFile, callbackParamList_Str);
+        FileUtil.writeFileContent(callbackLogFile, callbackParamList_bytes);
     }
 
     private void retryFailCallbackFile(){
@@ -235,8 +235,8 @@ public class TriggerCallbackThread {
 
         // load and clear file, retry
         for (File callbaclLogFile: callbackLogPath.listFiles()) {
-            String callbackParamList_str = FileUtil.readFileContent(callbaclLogFile);
-            List<HandleCallbackParam> callbackParamList = GsonTool.fromJsonList(callbackParamList_str, HandleCallbackParam.class);
+            byte[] callbackParamList_bytes = FileUtil.readFileContent(callbaclLogFile);
+            List<HandleCallbackParam> callbackParamList = (List<HandleCallbackParam>) JdkSerializeTool.deserialize(callbackParamList_bytes, List.class);
 
             callbaclLogFile.delete();
             doCallback(callbackParamList);

xxl-job-core/src/main/java/com/xxl/job/core/util/FileUtil.java

@@ -48,7 +48,7 @@ public class FileUtil {
     }
 
 
-    public static void writeFileContent(File file, String data) {
+    public static void writeFileContent(File file, byte[] data) {
 
         // file
         if (!file.exists()) {
@@ -59,7 +59,7 @@ public class FileUtil {
         FileOutputStream fos = null;
         try {
             fos = new FileOutputStream(file);
-            fos.write(data.getBytes("utf-8"));
+            fos.write(data);
             fos.flush();
         } catch (Exception e) {
             logger.error(e.getMessage(), e);
@@ -75,7 +75,7 @@ public class FileUtil {
 
     }
 
-    public static String readFileContent(File file) {
+    public static byte[] readFileContent(File file) {
         Long filelength = file.length();
         byte[] filecontent = new byte[filelength.intValue()];
 
@@ -85,7 +85,7 @@ public class FileUtil {
             in.read(filecontent);
             in.close();
 
-            return new String(filecontent, "utf-8");
+            return filecontent;
         } catch (Exception e) {
             logger.error(e.getMessage(), e);
             return null;

xxl-job-core/src/main/java/com/xxl/job/core/util/JdkSerializeTool.java

+package com.xxl.job.core.util;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.*;
+
+/**
+ * @author xuxueli 2020-04-12 0:14:00
+ */
+public class JdkSerializeTool {
+    private static Logger logger = LoggerFactory.getLogger(JdkSerializeTool.class);
+
+
+    // ------------------------ serialize and unserialize ------------------------
+
+    /**
+     * 将对象-->byte[] (由于jedis中不支持直接存储object所以转换成byte[]存入)
+     *
+     * @param object
+     * @return
+     */
+    public static byte[] serialize(Object object) {
+        ObjectOutputStream oos = null;
+        ByteArrayOutputStream baos = null;
+        try {
+            // 序列化
+            baos = new ByteArrayOutputStream();
+            oos = new ObjectOutputStream(baos);
+            oos.writeObject(object);
+            byte[] bytes = baos.toByteArray();
+            return bytes;
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+        } finally {
+            try {
+                oos.close();
+                baos.close();
+            } catch (IOException e) {
+                logger.error(e.getMessage(), e);
+            }
+        }
+        return null;
+    }
+
+
+    /**
+     * 将byte[] -->Object
+     *
+     * @param bytes
+     * @return
+     */
+    public static  <T> Object deserialize(byte[] bytes, Class<T> clazz) {
+        ByteArrayInputStream bais = null;
+        try {
+            // 反序列化
+            bais = new ByteArrayInputStream(bytes);
+            ObjectInputStream ois = new ObjectInputStream(bais);
+            return ois.readObject();
+        } catch (Exception e) {
+            logger.error(e.getMessage(), e);
+        } finally {
+            try {
+                bais.close();
+            } catch (IOException e) {
+                logger.error(e.getMessage(), e);
+            }
+        }
+        return null;
+    }
+
+
+}

xxl-job-core/src/main/java/com/xxl/job/core/util/ThrowableUtil.java

+package com.xxl.job.core.util;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+/**
+ * @author xuxueli 2018-10-20 20:07:26
+ */
+public class ThrowableUtil {
+
+    /**
+     * parse error to string
+     *
+     * @param e
+     * @return
+     */
+    public static String toString(Throwable e) {
+        StringWriter stringWriter = new StringWriter();
+        e.printStackTrace(new PrintWriter(stringWriter));
+        String errorMsg = stringWriter.toString();
+        return errorMsg;
+    }
+
+}