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 error 23 at org.apache.tomcat.websocket.FutureToSendHandler.get(FutureToSendHandler.java:120) 24 at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:281) 25 ... 15 more 26 Caused by: java.net.SocketException: Software caused connection abort: socket write error 27 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 session
17 */
18 @OnOpen
19 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 session
28 */
29 @OnMessage
30 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 session
49 */
50 @OnClose
51 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
原文地址：https://www.cnblogs.com/Charles-Yuan/p/9785147.html
时间： 2024-11-07 19:04:54