Socket 多线程通信

   Socket 通信

 1-Socket：socket的通信建立，由两部分来实现，分别是：ServerSocket 和 Socket；ServerSocket负责监听 （accept）Socket端的连接请求，并接收数据流（根据指定 port 和 host）；在ServerSocket端也建立一个Socket来和Socket端进行通信；

服务端实现-       

package com.bdc;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class SocketChatServers {
  private int port;//设置 连接 端口
  
  public  SocketChatServers(int port){
    this.port = port;
  }
  //业务处理
  public void service() throws IOException{
    int i = 0;
    ServerSocket serverSocket = new ServerSocket(port,3);//建立 Socket 服务
    while(true){
      Socket socket = serverSocket.accept();//等待 Socket 连接
      System.out.println("第"+(++i)+"个客户已连接...");
      new ServerSocketThread(socket).start();
      
    }
    
  }
  
  public static void main(String[] args) throws IOException {
    new SocketChatServers(9001).service();
    
  }
  
}  

class ServerSocketThread extends Thread{
  
  private Socket socket ;
  
  public ServerSocketThread(Socket socket){
    this.socket = socket;
  }
  
  
  @Override
  public void run(){
    
    DataInputStream dis = null;
    DataOutputStream dos = null;
    try {
      dis = new DataInputStream(socket.getInputStream());
      dos = new DataOutputStream(socket.getOutputStream());
      Scanner scan = new Scanner(System.in);
      while(true){
        String sendToClient = scan.nextLine();
        dos.writeUTF(sendToClient);
        System.out.println("服务器 说:"+sendToClient);
        String accept = dis.readUTF();
        System.out.println("客户端 说"+accept);
        
      }
      
    } catch (IOException e) {
      e.printStackTrace();
    }finally{
      try {
        dis.close();
        dos.close();
        socket.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
  
  
}

客户端实现-

</pre></p><p align="left"><span style="font-size:18px;"><span style="font-size:24px;"><span style="font-size:18px;"></span></span></span><pre name="code" class="java">package com.bdc;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ConnectException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class SocketChatClient {

  private String host;//主机 ip
  private int port;//连接 端口
  
  public SocketChatClient(String host,int port){
    this.host = host;
    this.port = port;
  }
  
  public void client() throws ConnectException{
    Socket socket = null ;//建立 Socket 连接
    DataInputStream dis = null;
    DataOutputStream dos = null;
    try {
      socket = new Socket(host,port);//连接 Socket服务器
      dis = new DataInputStream(socket.getInputStream());
      dos = new DataOutputStream(socket.getOutputStream());
      Scanner scan = new Scanner(System.in);
      while(true){
        String sendToServer = scan.nextLine();
        dos.writeUTF(sendToServer);
        System.out.println("客户端 说: "+sendToServer);
        String accept = dis.readUTF();
        System.out.println("服务器 说: "+accept);
      }
    
    }catch (ConnectException e) {
      System.err.println("**** 连接 异常 ****");
    }catch(IOException e){
      System.err.println("**** IO 异常 ****");
    }finally{ 
      try {
        dis.close();
        dos.close();
        socket.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    
  }
  
  public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);
    
    System.err.println("请输入要登录的host :");
    String host = scan.nextLine();
    System.err.println("请输入连接 Port :");
    int port = scan.nextInt();
    
    try {
      new SocketChatClient(host, port).client();
    } catch (ConnectException e) {
      System.err.println("**** 连接 异常 ****");
    }
    
    
  }
}

请输入要登录的host :
localhost
请输入连接 Port :
9001
hello

客户端 说: hello