Socket--Java

Server.java

package socket;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    //监听的端口
    public static final int PORT = 54039;
    
    public static void main(String[] args)
    {
        new Server().start();
    }
    
    //启动监听线程的方法
    public void start()
    {
        ServerSocket serverSocket = null;
        try {
            //新建一个ServerSocket对象，监听PORT端口,可能会抛出IOException
            serverSocket  = new ServerSocket(PORT);
            System.out.println("serverScoket:" + serverSocket);
            //循环监听
            while(true)
            {
                //获取客户端连接，如果没有则阻塞
                Socket clientSocket = serverSocket.accept();
                //启动线程处理监听到的数据并启动线程
                new Thread(new DataRunnable(clientSocket)).start();
                
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally{
            if (null != serverSocket)
            {
                try {
                    serverSocket.close();
                    System.out.println("close serverSocket success!");
                } catch (IOException e) {
                    System.out.println("close serverSocket failed!");
                }
            }
        }
        
    }
    
    /**
     * 处理监听信息的job
     */
    private class DataRunnable implements Runnable
    {
        Socket client;
        
        public DataRunnable(Socket client) {
            super();
            this.client = client;
        }

        public void run() {
            try {
                //读取客户端socket取输入流,包装成DataInputStream
                DataInputStream dataIn = new DataInputStream(client.getInputStream());
                DataOutputStream dataOut = new DataOutputStream(client.getOutputStream());
                String content = dataIn.readUTF();//有read其他格式的方法，具体见api
                //打印到控制台
                System.out.println("content read in from client:" + content);
                
                //向客户端回复信息
                System.out.println("请输入要回复的内容：");
                String reply = new BufferedReader(new InputStreamReader(System.in)).readLine();
                dataOut.writeUTF(reply);
                
                if("Close".equals(content))
                {
                    System.out.println("client has been closed ,i want to be closed too");
                }
                dataIn.close();
                dataOut.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            
        }
        
    }
}

Client.java

package socket;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

public class Client {
    public static final String ADDR = "localhost";//监听本机
    public static final int PORT = 54039;//端口
    
    public static void main(String[] args)
    {    
        while(true)
        {
            Socket client = null;
            DataInputStream dataIn = null;
            DataOutputStream dataout = null;
            try {
                //创建客户端socket连接到主机服务器端
                client = new Socket(ADDR, PORT);
                
                dataIn = new DataInputStream(client.getInputStream());
                dataout = new DataOutputStream(client.getOutputStream());
                
                //向服务器发送数据
                System.out.println("请输入数据：");
                String content = new BufferedReader(new InputStreamReader(System.in)).readLine();
                dataout.writeUTF(content);
                
                //读取服务器端返回的数据
                String reply = dataIn.readUTF();
                System.out.println("server reply:" + reply);
                
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            finally{
                try {
                    if(null!=dataIn) dataIn.close();
                    if(null!=dataout) dataout.close();
                    if(null!=client) client.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }
}