ebSocket.之.基础入门-断开连接处理
在《WebSocket.之.基础入门-后端响应消息》的代码基础之上，继续更新代码。代码只改动了：TestSocket.java 和 index.jsp 两个文件。
先说问题：
当前后端建立连接之后，如果此时关闭浏览器，或者点击浏览器的回退。只要退出了建立连接的页面。后台程序是会报错的。分别如下图所示：
正常建立连接页面：
现在退出当前建立连接的页面，后台日志如下所示：
1 当前session的id是：0 2 从前端页面传过来的数据是：早上好.. 3 十月 14, 2018 8:52:41 上午 org.apache.tomcat.websocket.pojo.PojoEndpointBase onError 4 严重: No error handling configured for [com.charles.socket.TestSocket] and the following error occurred 5 java.io.IOException: java.util.concurrent.ExecutionException: java.net.SocketException: Software caused connection abort: socket write error 6 ????at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:286) 7 ????at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:572) 8 ????at org.apache.tomcat.websocket.WsSession.onClose(WsSession.java:495) 9 ????at org.apache.tomcat.websocket.WsFrameBase.processDataControl(WsFrameBase.java:348)10 ????at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:290)11 ????at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:131)12 ????at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:67)13 ????at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:204)14 ????at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:203)15 ????at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:93)16 ????at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:635)17 ????at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)18 ????at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)19 ????at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)20 ????at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)21 ????at java.lang.Thread.run(Thread.java:748)22 Caused by: java.util.concurrent.ExecutionException: java.net.SocketException: Software caused connection abort: socket write error23 ????at org.apache.tomcat.websocket.FutureToSendHandler.get(FutureToSendHandler.java:120)24 ????at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:281)25 ????... 15 more26 Caused by: java.net.SocketException: Software caused connection abort: socket write error27 ????at java.net.SocketOutputStream.socketWrite0(Native Method)28 ????at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)29 ????at java.net.SocketOutputStream.write(SocketOutputStream.java:155)30 ????at org.apache.coyote.http11.upgrade.BioServletOutputStream.doWrite(BioServletOutputStream.java:38)31 ????at org.apache.coyote.http11.upgrade.AbstractServletOutputStream.writeInternal(AbstractServletOutputStream.java:153)32 ????at org.apache.coyote.http11.upgrade.AbstractServletOutputStream.write(AbstractServletOutputStream.java:121)33 ????at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(WsRemoteEndpointImplServer.java:94)34 ????at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(WsRemoteEndpointImplServer.java:81)35 ????at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:456)36 ????at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:344)37 ????at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:276)38 ????... 15 more
现在开始处理上面的异常
TestSocket.java
1 package com.charles.socket; 2 ?3 import java.io.IOException; 4 ?5 import javax.websocket.OnClose; 6 import javax.websocket.OnMessage; 7 import javax.websocket.OnOpen; 8 import javax.websocket.Session; 9 import javax.websocket.server.ServerEndpoint;10 11 @ServerEndpoint(value = "/helloSocket")12 public class TestSocket {13 14 ????/***15 ?????* 当建立链接时，调用的方法.16 ?????* @param session17 ?????*/18 ????@OnOpen19 ????public void open(Session session) {20 ????????21 ????????System.out.println("开始建立了链接...");22 ????????System.out.println("当前session的id是：" + session.getId());23 ????}24 ????25 ????/***26 ?????* 处理消息的方法.27 ?????* @param session28 ?????*/29 ????@OnMessage30 ????public void message(Session session, String data) {31 ????????32 ????????System.out.println("开始处理消息...");33 ????????System.out.println("当前session的id是：" + session.getId());34 ????????System.out.println("从前端页面传过来的数据是：" + data);35 ????????36 ????????37 ????????String message = "你好，我是后端程序...";38 ????????try {39 ????????????session.getBasicRemote().sendText(message);40 ????????} catch (IOException e) {41 ????????????e.printStackTrace();42 ????????}43 ????????44 ????}45 ????46 ????/***47 ?????* 处理断开连接的方法.48 ?????* @param session49 ?????*/50 ????@OnClose51 ????public void close(Session session) {52 ????????System.out.println("Session-ID是："+session.getId() + ",退出了系统...欢迎下次再来...");53 ????}54 ????55 }index.jsp 代码
1 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 3 <html> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 6 <title>Charles-WebSocket</title> 7 ?8 <script type="text/javascript"> 9 ????10 ????var websocket = null;11 ????var target = "ws://localhost:8080/websocket/helloSocket";12 ????13 ????function buildConnection() {14 ????????15 ????????if(‘WebSocket‘ in window) {16 ????????????websocket = new WebSocket(target); ???????17 ????????} else if(‘MozWebSocket‘ in window) {18 ????????????websocket = MozWebSocket(target);19 ????????} else {20 ????????????window.alert("浏览器不支持WebSocket");21 ????????}22 ????????23 ????????// 添加监听消息的方法24 ????????websocket.onmessage = function(event) {25 ?????????????console.log(event)26 ?????????????console.log(event.data)27 ?????????????document.getElementById("serverMsg").innerHTML = "<p>后端消息 ："+ event.data +"</p>"28 ????????}29 ????????30 ????????// 监听断开连接的方法.31 ????????websocket.onclose = function(event) {32 ????????????// 如没有业务需求，可以不写这个关闭监听的方法.33 ????????????// 业务需求，例如：聊天室，当某人退出的时候，会给出提示，xxx退出了...34 ????????}35 ????}36 ????37 ????// 退出系统时, 关闭建立的WebSocket链接38 ????window.onbeforeunload = function () {39 ????????websocket.close();40 ????}41 ????42 ????43 ????// 往后台服务器发送消息.44 ????function sendMessage() {45 ????????46 ????????var sendmsg = document.getElementById("sendMsg").value;47 ????????console.log("发送的消息：" + sendmsg);48 ????????49 ????????// 发送至后台服务器中.50 ????????websocket.send(sendmsg);51 ????}52 ????53 </script>54 </head>55 <body>56 ????57 ????<button onclick="buildConnection();">开始建立链接</button>58 ????<hr>59 ????<input id="sendMsg" /> <button onclick="sendMessage();">消息发送</button>60 ????<div id="serverMsg"></div>61 62 </body>63 </html>访问浏览器，输入地址：http://localhost:8080/websocket
建立连接，发送消息，然后在退出，在发送消息，在退出
在次访问系统..并退出...
系统正常运行，异常信息（... Caused by: java.net.SocketException: Software caused connection abort: socket write error.. ）解决.
如有问题，欢迎纠正！！！
如有转载，请标明源处：https://www.cnblogs.com/Charles-Yuan/p/9785147.html
WebSocket.之.基础入门-断开连接处理
原文地址：https://www.cnblogs.com/Charles-Yuan/p/9785147.html