如何在套接字通道中發送和接收序列化對象

Question

我想通過套接字通道發送序列化對象。 我想讓「Hi friend」字符串作爲序列化對象，然後在socket通道中寫入這個對象，而在另一端我想讀取同一個對象並檢索數據。

我想用Java做的所有這些事情SocketChannel。這個怎麼做？ 我已經嘗試過像下面這樣，但沒有在接收端獲得任何數據。

private static void writeObject(Object obj, SelectionKey selectionKey) { 
    ObjectOutputStream oos; 
    try { 
     SocketChannel channel = (SocketChannel) selectionKey.channel(); 
     oos = new ObjectOutputStream(Channels.newOutputStream(channel)); 

     oos.writeObject(obj); 
    } catch (IOException ex) { 
     ex.printStackTrace(); 
    } 
} 

private static Object readObject(SelectionKey selectionKey) { 
    ObjectInputStream ois; 
    Object obj = new Object(); 
    SocketChannel channel = (SocketChannel) selectionKey.channel(); 
    try { 
     ois = new ObjectInputStream(Channels.newInputStream(channel)); 
     obj = ois.readObject(); 
    } catch (Exception ex) { 
     ex.printStackTrace(); 
    } 
    return obj; 
} 

Answer 1

你的SocketChannel處理似乎是不完整的，請參閱SocketChannels傳輸一個字節這個完整例如：

/* 
* Writer 
*/ 
import java.io.IOException; 
import java.io.ObjectOutputStream; 
import java.net.InetSocketAddress; 
import java.nio.channels.ServerSocketChannel; 
import java.nio.channels.SocketChannel; 

public class Sender { 
    public static void main(String[] args) throws IOException { 
     System.out.println("Sender Start"); 

     ServerSocketChannel ssChannel = ServerSocketChannel.open(); 
     ssChannel.configureBlocking(true); 
     int port = 12345; 
     ssChannel.socket().bind(new InetSocketAddress(port)); 

     String obj ="testtext"; 
     while (true) { 
      SocketChannel sChannel = ssChannel.accept(); 

      ObjectOutputStream oos = new 
         ObjectOutputStream(sChannel.socket().getOutputStream()); 
      oos.writeObject(obj); 
      oos.close(); 

      System.out.println("Connection ended"); 
     } 
    } 
} 

與讀者

/* 
* Reader 
*/ 
import java.io.IOException; 
import java.io.ObjectInputStream; 
import java.net.InetSocketAddress; 
import java.nio.channels.SocketChannel; 

public class Receiver { 
    public static void main(String[] args) 
    throws IOException, ClassNotFoundException { 
     System.out.println("Receiver Start"); 

     SocketChannel sChannel = SocketChannel.open(); 
     sChannel.configureBlocking(true); 
     if (sChannel.connect(new InetSocketAddress("localhost", 12345))) { 

      ObjectInputStream ois = 
        new ObjectInputStream(sChannel.socket().getInputStream()); 

      String s = (String)ois.readObject(); 
      System.out.println("String is: '" + s + "'"); 
     } 

     System.out.println("End Receiver"); 
    } 
} 

當你第一次啓動服務器，那麼接收器，你會得到以下輸出：

服務器的控制檯

Sender Start 
Connection ended 

接收器的控制檯

Receiver Start 
String is: 'testtext' 
End Receiver 

這是不是最好的解決辦法，但會根據您的使用Java的ServerSocketChannel