JAVA------9.JavaWeb自启动线程，并加入socket编程

Posted on 2017-03-14 10:44  奇思妙想的香菜  阅读(1209)  评论(0)  编辑  收藏  举报 
  1 package com.caipei.thread;
  2 
  3 import java.io.BufferedReader;
  4 import java.io.IOException;
  5 import java.io.InputStreamReader;
  6 import java.io.OutputStreamWriter;
  7 import java.io.Writer;
  8 import java.net.ServerSocket;
  9 import java.net.Socket;
 10 import java.sql.Connection;
 11 import java.sql.DriverManager;
 12 import java.sql.ResultSet;
 13 import java.sql.SQLException;
 14 import java.sql.Statement;
 15 import java.text.SimpleDateFormat;
 16 import java.util.Calendar;
 17 import java.util.Random;
 18 
 19 import javax.servlet.ServletContextEvent;
 20 import javax.servlet.ServletContextListener;
 21 
 22 
 23 
 24 
 25 public class MyListener implements ServletContextListener{
 26 
 27     private MyThread myThread; 71 
 72     @Override
 73     public void contextInitialized(ServletContextEvent arg0) {
 74         // TODO Auto-generated method stub
 75         String str=null;
 76         if (str==null&&myThread==null) {
 77             myThread=new MyThread();
 78             myThread.start();//servlet 上下文初始化时启动socket
 79         }
 80     }
 81 
 82 
 83     //自定义一个class 线程类继承自线程类 重写 
 84     class MyThread extends Thread
 85     {
 86 
 87         public static final int PORT = 4800;//监听的端口号     
 88         public void run()
 89         {
 90             while(!this.isInterrupted())
 91             {
 92                 try {
 93                     Thread.sleep(2000);//每隔2000ms执行一次
 94                 } catch (Exception e) {
 95                     // TODO: handle exception
 96                     e.printStackTrace();
 97                 }
 98 
 99 
100                 //定义一个ServerSocket监听在端口4800上  
101                 ServerSocket server = null;
102                 try {
103                     server = new ServerSocket(PORT);
104                 } catch (IOException e) {
105                     // TODO Auto-generated catch block
106                     e.printStackTrace();
107                 }  
108                 while (true) {  
109                     //server尝试接收其他Socket的连接请求，server的accept方法是阻塞式的  
110                     Socket socket = null;
111                     try {
112                         socket = server.accept();
113                     } catch (IOException e) {
114                         // TODO Auto-generated catch block
115                         e.printStackTrace();
116                     }  
117                     //每接收到一个Socket就建立一个新的线程来处理它  
118 
119                     new Thread(new Task(socket)).start();  
120                 }  
121             }
122 
123         }
124 
125 
126         /** 
127          * 用来处理Socket请求的 
128          */  
129         class Task implements Runnable {  
130 
131             private Socket socket;  
132 
133             public Task(Socket socket) {  
134                 this.socket = socket;  
135             }  
136 
137             public void run() {  
138                 try {  
139                     handleSocket();  
140                 } catch (Exception e) {  
141                     e.printStackTrace();  
142                 }  
143             }  
144 
145             /** 
146              * 跟客户端Socket进行通信 
147              * @throws Exception 
148              */  
149             public void handleSocket() throws Exception {  
150                 BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));  
151                 StringBuilder sb = new StringBuilder();  
152                 String temp;  
153                 int index;  
154                 int flag=1;
155                 while ((temp=br.readLine()) != null) {  
156                     System.out.println(temp);  
157                     if ((index = temp.indexOf("eof")) != -1) {//遇到eof时就结束接收  
158                         sb.append(temp.substring(0, index));  
159                         break;  
160                     }  
161                     sb.append(temp);  
162                 }

加入jar包

在web.xml里加入配置文件

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 3   <display-name>JavaWebThread</display-name>
 4   <welcome-file-list>
 5     <welcome-file>index.html</welcome-file>
 6     <welcome-file>index.htm</welcome-file>
 7     <welcome-file>index.jsp</welcome-file>
 8     <welcome-file>default.html</welcome-file>
 9     <welcome-file>default.htm</welcome-file>
10     <welcome-file>default.jsp</welcome-file>
11   </welcome-file-list>
12   
13   <listener>
14   <listener-class> com.caipei.thread.MyListener</listener-class>
15  </listener>
16   
17 </web-app>