Java Socket实战之三：传输对象

转自：https://i.cnblogs.com/EditPosts.aspx?opt=1

前面两篇文章介绍了怎样建立Java Socket通信，这一篇说一下怎样使用Java Socket来传输对象。

首先需要一个普通的对象类，由于需要序列化这个对象以便在网络上传输，所以实现java.io.Serializable接口就是必不可少的了，如下：

 package com.googlecode.garbagecan.test.socket.sample3;  

 public class User implements java.io.Serializable {
     private static final long serialVersionUID = 1L;
     private String name;
     private String password;  

     public User() {  

     }  

     public User(String name, String password) {
         this.name = name;
         this.password = password;
     }  

     public String getName() {
         return name;
     }  

     public void setName(String name) {
         this.name = name;
     }  

     public String getPassword() {
         return password;
     }  

     public void setPassword(String password) {
         this.password = password;
     }
 } 

对于Server端的代码，代码中分别使用了ObjectInputStream和ObjectOutputStream来接收和发送socket中的InputStream和OutputStream，然后转换成Java对象，如下：

 package com.googlecode.garbagecan.test.socket.sample3;  

 import java.io.*;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.util.logging.Level;
 import java.util.logging.Logger;  

 public class MyServer {  

     private final static Logger logger = Logger.getLogger(MyServer.class.getName());  

     public static void main(String[] args) throws IOException {
         ServerSocket server = new ServerSocket(10000);  

         while (true) {
             Socket socket = server.accept();
             invoke(socket);
         }
     }  

     private static void invoke(final Socket socket) throws IOException {
         new Thread(new Runnable() {
             public void run() {
                 ObjectInputStream is = null;
                 ObjectOutputStream os = null;
                 try {
                     is = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
                     os = new ObjectOutputStream(socket.getOutputStream());  

                     Object obj = is.readObject();
                     User user = (User)obj;
                     System.out.println("user: " + user.getName() + "/" + user.getPassword());  

                     user.setName(user.getName() + "_new");
                     user.setPassword(user.getPassword() + "_new");  

                     os.writeObject(user);
                     os.flush();
                 } catch (IOException ex) {
                     logger.log(Level.SEVERE, null, ex);
                 } catch(ClassNotFoundException ex) {
                     logger.log(Level.SEVERE, null, ex);
                 } finally {
                     try {
                         is.close();
                     } catch(Exception ex) {}
                     try {
                         os.close();
                     } catch(Exception ex) {}
                     try {
                         socket.close();
                     } catch(Exception ex) {}
                 }
             }
         }).start();
     }
 } 

Client也和Server端类似，同样使用ObjectOutputStream和ObjectInputStream来处理，如下：

 package com.googlecode.garbagecan.test.socket.sample3;  

 import java.io.BufferedInputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.net.Socket;
 import java.util.logging.Level;
 import java.util.logging.Logger;  

 public class MyClient {  

     private final static Logger logger = Logger.getLogger(MyClient.class.getName());  

     public static void main(String[] args) throws Exception {
         for (int i = 0; i < 100; i++) {
             Socket socket = null;
             ObjectOutputStream os = null;
             ObjectInputStream is = null;  

             try {
                 socket = new Socket("localhost", 10000);  

                 os = new ObjectOutputStream(socket.getOutputStream());
                 User user = new User("user_" + i, "password_" + i);
                 os.writeObject(user);
                 os.flush();  

                 is = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
                 Object obj = is.readObject();
                 if (obj != null) {
                     user = (User)obj;
                     System.out.println("user: " + user.getName() + "/" + user.getPassword());
                 }
             } catch(IOException ex) {
                 logger.log(Level.SEVERE, null, ex);
             } finally {
                 try {
                     is.close();
                 } catch(Exception ex) {}
                 try {
                     os.close();
                 } catch(Exception ex) {}
                 try {
                     socket.close();
                 } catch(Exception ex) {}
             }
         }
     }
 } 

最后测试上面的代码，首先运行Server类，然后运行Client类，就可以分别在Server端和Client端控制台看到接收到的User对象实例了。