客戶端從服務器請求

Question

//這裏的公開，是要求服務器發送公鑰到客戶

package gameserver; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.Scanner; 
import java.net.Socket; 
import java.io.*; 
import javax.swing.JFrame; 
import java.awt.*; 
import javax.swing.*; 

public class GameClient extends JFrame implements ActionListener { 

    private JButton b1 = new JButton("press"); 

    public GameClient() { 
     GridLayout layout = new GridLayout(3, 0, 0, 0); 
     setLayout(layout); 
     setSize(320,150); 

     add(b1); 
     b1.addActionListener(this); 

    } 

    public static void main(String args[]) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 
      public void run() { 
       GameClient frame = new GameClient(); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    public void actionPerformed(ActionEvent ae) { 
     if (ae.getSource() == b1) { 
      Socket socket = null; 
      ObjectInputStream in = null; 
      ObjectOutputStream out = null; 

      Scanner console = new Scanner(System.in); 

      try { 
       socket = new Socket("127.0.0.1", 12346); 
       in = new ObjectInputStream(socket.getInputStream()); 
       out = new ObjectOutputStream(socket.getOutputStream()); 
       Object result; 
       result = in.readObject(); 

       System.out.println(result); 
      } catch (IOException ioe) { 
       ioe.printStackTrace(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } finally { 
       try { 
        if (in != null) { 
         in.close(); 
        } 
        if (out != null) { 
         out.close(); 
        } 
        if (socket != null) { 
         socket.close(); 
        } 
       } catch (IOException ioe) { 
        ioe.printStackTrace(); 
       } 
      }   
     } 

    } 
} 

//服務器代碼，公鑰發送給客戶端時，客戶端連接

代碼

package gameserver; 

import java.io.*; 
import java.net.*; 
import java.security.*; 
import javax.crypto.*; 

public class GameServer { 
    public static void main(String arg[]) { 
     try { 
      ServerSocket ss = new ServerSocket(12346); 

         while(true) { 
      Socket s = ss.accept(); 
      ClientHandler ch = new ClientHandler(s); 
         ch.start(); 

         } 
     } 
     catch(IOException ioe) { 
      ioe.printStackTrace(); 
     } 
    } 
} 

class ClientHandler extends Thread { 

    Socket socket; 
    KeyPair keyPair = null; 

    public ClientHandler(Socket socket) { 
     this.socket = socket; 

    } 

    public KeyPair genKeyPair() { 

     try { 
      KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); 
      keyGen.initialize(1024); 
      keyPair = keyGen.generateKeyPair(); 
      //PrivateKey privateKey = keyPair.getPrivate(); 
      //PublicKey publicKey = keyPair.getPublic(); 

     } catch (NoSuchAlgorithmException e) { 
      System.out.println(e.getMessage()); 
     } 
     return keyPair; 
    } 

    public void run() { 
     try {    

      ObjectInputStream Ois = new ObjectInputStream(socket.getInputStream());    
      ObjectOutputStream Oos = new ObjectOutputStream(socket.getOutputStream()); 

      keyPair = genKeyPair(); 
      PublicKey publicKey = keyPair.getPublic(); 
      Oos.writeObject(publicKey); 

      socket.close(); 
     } catch(IOException ioe) { 
      ioe.printStackTrace(); 
     } 
    } 

} 

問題是，當我按下按鈕時，客戶端似乎沒有連接到服務器，並且什麼也收不到，有什麼想法？感謝

Answer 1

你的密碼會被鎖定在這一行：

ObjectInputStream Ois = new ObjectInputStream(socket.getInputStream()); 

從機制的文檔

創建一個ObjectInputStream的從指定的InputStream 讀取。從流中讀取串行化流頭並且驗證 。此構造函數將阻塞，直到相應的ObjectOutputStream已寫入並刷新標頭爲止。

如果安裝了安全管理，通過 覆蓋ObjectInputStream.readFields或 ObjectInputStream.readUnshared方法子類的構造函數調用 當直接或間接此構造將檢查 了「enableSubclassImplementation」 SerializablePermission。

修復：

更改

ObjectInputStream Ois = new ObjectInputStream(socket.getInputStream());    
ObjectOutputStream Oos = new ObjectOutputStream(socket.getOutputStream()); 

到

ObjectOutputStream Oos = new ObjectOutputStream(socket.getOutputStream()); 
ObjectInputStream Ois = new ObjectInputStream(socket.getInputStream());