没有分在技术区发帖

[jibee]

public String receiveMessage( )
throws IOException {
byte[ ] receiveBuffer = new byte[MAX_LEN];
DatagramPacket datagram =
new DatagramPacket(receiveBuffer, MAX_LEN);
this.receive(datagram);
String message = new String(receiveBuffer);
return message;
} //end receiveMessage


为什么这个接收到的message 打印出来除了前部分是接收的信息，后部分全是a ?

例如接收到的信息为Mary，打印出来则是Maryaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

求解，谢谢

[hyl100041943]

每天回帖即可获得10分可用分！

[stillback]

敢把全部代码放上来嘛...

[jibee]

import java.net.*;
import java.io.*;

public class MyDatagramSocket extends DatagramSocket {
static final int MAX_LEN = 100;

MyDatagramSocket() throws SocketException{
super();
}

MyDatagramSocket(int portNo) throws SocketException{
super(portNo);
}
public void sendMessage(InetAddress receiverHost,
int receiverPort,
String message)
throws IOException {
byte[ ] sendBuffer = message.getBytes( );
DatagramPacket datagram =
new DatagramPacket(sendBuffer, sendBuffer.length,
receiverHost, receiverPort);
this.send(datagram);
} // end sendMessage

public String receiveMessage( )
throws IOException {
byte[ ] receiveBuffer = new byte[MAX_LEN];
DatagramPacket datagram =
new DatagramPacket(receiveBuffer, MAX_LEN);
this.receive(datagram);
String message = new String(receiveBuffer);
return message;
} //end receiveMessage

public DatagramMessage receiveMessageAndSender( )
throws IOException {
byte[ ] receiveBuffer = new byte[MAX_LEN];
DatagramPacket datagram =
new DatagramPacket(receiveBuffer, MAX_LEN);
this.receive(datagram);
// create a DatagramMessage object, to contain message
// received and sender's address
DatagramMessage returnVal = new DatagramMessage( );
returnVal.putVal(new String(receiveBuffer),
datagram.getAddress( ),
datagram.getPort( ));
return returnVal;
} //end receiveMessage
} //end class

[jibee]

import java.net.*;
import java.io.*;

/**
 * A subclass of DatagramSocket which contains 
 * methods for sending and receiving messages
 * @author J. B. Lin
 */

public class MyDatagramSocket extends DatagramSocket {
static final int MAX_LEN = 100;

   MyDatagramSocket() throws SocketException{
   	 super();
   }
 
   MyDatagramSocket(int portNo) throws SocketException{
     super(portNo);
   }
   public void sendMessage(InetAddress receiverHost,
                           int receiverPort,
                           String message)
   		          throws IOException {	
         byte[ ] sendBuffer = message.getBytes( );                                     
         DatagramPacket datagram = 
            new DatagramPacket(sendBuffer, sendBuffer.length, 
                                  receiverHost, receiverPort);
         this.send(datagram);
   } // end sendMessage

   public String receiveMessage( )
		throws IOException {		
         byte[ ] receiveBuffer = new byte[MAX_LEN];
         DatagramPacket datagram =
            new DatagramPacket(receiveBuffer, MAX_LEN);
         this.receive(datagram);
         String message = new String(receiveBuffer);
         return message;
   } //end receiveMessage

   public DatagramMessage receiveMessageAndSender( )
		throws IOException {		
         byte[ ] receiveBuffer = new byte[MAX_LEN];
         DatagramPacket datagram =
            new DatagramPacket(receiveBuffer, MAX_LEN);
         this.receive(datagram);
         // create a DatagramMessage object, to contain message
         //   received and sender's address
         DatagramMessage returnVal = new DatagramMessage( );
         returnVal.putVal(new String(receiveBuffer),
                          datagram.getAddress( ),
                          datagram.getPort( ));
         return returnVal;
   } //end receiveMessage
} //end class

[jibee]

我也回帖