javaweb启动时启动socket服务端代码实现

这篇文章主要介绍了javaweb启动时启动socket服务端代码实现,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

说明：在javaweb项目启动的时候启动socket服务端，可以接受客户端发送过来的数据，客户端可以反复断开连接

1.新建SocketThread线程类

package com.wlw.modules.startImplement.web;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;


public class SocketThread extends Thread {
  private ServerSocket serverSocket = null;

  public SocketThread(ServerSocket serverScoket){
    try {
      if(null == serverSocket){
 this.serverSocket = new ServerSocket(8877);
 System.out.println("socket start");
      }
    } catch (Exception e) {
      System.out.println("SocketThread创建socket服务出错");
      e.printStackTrace();
    }

  }

  public void run(){
    while(!this.isInterrupted()){
      try {
 Socket socket = serverSocket.accept();

 if(null != socket && !socket.isClosed()){
   //处理接受的数据
   new SocketOperate(socket).start();
 }
// socket.setSoTimeout(30000);  //设置超时

      }catch (Exception e) {

      }
    }
  }


  public void closeSocketServer(){
    try {
      if(null!=serverSocket && !serverSocket.isClosed())
      {
 serverSocket.close();
      }
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
}

2.新建SocketOperate,用于接受客户端传来的数据

package com.wlw.modules.startImplement.web;

import com.wlw.modules.lhjh.socket.tstandard.MessageParsing;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;


public class SocketOperate extends Thread {
  private Socket socket;

  public SocketOperate(Socket socket) {
    this.socket=socket;
  }

  @Override
  public void run() {
    try {
      //封装输入流（接收客户端的流）
      BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());
      DataInputStream dis = new DataInputStream(bis);
      byte[] bytes = new byte[1]; // 一次读取一个byte

      String ret = "";
      while (dis.read(bytes) != -1) {
 ret += MessageParsing.bytesToHexString(bytes) + "";
 if (dis.available() == 0) { //一个请求

   System.out.println("转换为字符串后:"+MessageParsing.hexStringToString(ret));
   System.out.println("转为map后的数据："+MessageParsing.stringToMap(MessageParsing.hexStringToString(ret)));

   ret = "";
 }
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      System.out.println("client is over");
      if (socket != null) {
 try {
   socket.close();
 } catch (IOException e) {
   e.printStackTrace();
 }
      }
    }
  }
}

3.新建InitJob，web项目启动的时候会执行里面的方法，去启动socket，可以用串口调试工具测试

package com.wlw.modules.startImplement.web;

import com.wlw.common.config.Global;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;


//创建的类名根据需要定义，但一定要实现ServletContextListener接口
public class InitJob implements ServletContextListener {

  //socket server 线程
  private SocketThread socketThread;

  
  @Override
  public void contextInitialized(ServletContextEvent arg0) {
    // TODO Auto-generated method stub
    //这里可以放你要执行的代码或方法
    if(null==socketThread && "yes".equals(Global.getConfig("socket"))){
//      MessageParsing.calculation();
      //新建线程类
      socketThread=new SocketThread(null);
      //启动线程
      socketThread.start();
    }
  }

  
  @Override
  public void contextDestroyed(ServletContextEvent arg0) {
    // TODO Auto-generated method stub
    if(null!=socketThread && !socketThread.isInterrupted()){
      socketThread.closeSocketServer();
      socketThread.interrupt();
    }
  }

}

4.这里需要一个报文解析工具类

package com.wlw.modules.lhjh.socket.tstandard;

import java.util.HashMap;
import java.util.Map;


public class MessageParsing {
  
  public static Map stringToMap(String arr){
    arr=arr.replaceAll(",",";");
    Map map = new HashMap();
    if (null != arr) {
      String[] param = arr.split(";");
      for (int i = 0; i < param.length; i++) {
 //这里的 index 要 >-1 才是 map格式
 int index = param[i].indexOf('=');
 if(index>-1)
   map.put(param[i].substring(0,index), param[i].substring((index + 1)));
      }
    }
    return map;
  }

  
  public static String bytesToHexString(byte[] bytes) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < bytes.length; i++) {
      String hex = Integer.toHexString(0xFF & bytes[i]);
      if (hex.length() == 1) {
 sb.append('0');
      }
      sb.append(hex);
    }
    return sb.toString();
  }

  
  public static String hexStringToString(String s) {
    if (s == null || s.equals("")) {
      return null;
    }
    s = s.replace(" ", "");
    byte[] baKeyword = new byte[s.length() / 2];
    for (int i = 0; i < baKeyword.length; i++) {
      try {
 baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16));
      } catch (Exception e) {
 e.printStackTrace();
      }
    }
    try {
      s = new String(baKeyword, "UTF-8");
      new String();
    } catch (Exception e1) {
      e1.printStackTrace();
    }
    return s;
  }
}

这样就大功告成了，启动web项目，就可以接受客户端过来的数据了

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