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();
                 }
             }
         }
     }
 }