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。