任务是
(1)通过网桥从客户端向服务器发送消息
(2)通过网桥将大写邮件通过服务器从服务器发送回客户端
(1)完成 我在将消息发送回客户端时遇到问题
以下是课程:
UDPCLIENT
import java.io.*;
import java.net.*;
class UDPClient
{
public static void main(String args[]) throws Exception
{
//getting input from the user and sending to Bridge
BufferedReader inFromUser =
new BufferedReader(new InputStreamReader(System.in));
DatagramSocket clientSocket = new DatagramSocket();
InetAddress IPAddress = InetAddress.getByName("localhost");
byte[] sendData = new byte[1024];
byte[] receiveData = new byte[1024];
String sentence = inFromUser.readLine();
sendData = sentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, 4000);
clientSocket.send(sendPacket);
//Getting data from the Bridge
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
String modifiedSentence = new String(receivePacket.getData());
System.out.println("C: FROM SERVER:" + modifiedSentence);
clientSocket.close();
}
}
UDPSERVER
import java.io.*;
import java.net.*;
class UDPServer
{
public static void main(String args[]) throws Exception
{
DatagramSocket serverSocket = new DatagramSocket(5000);
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
while(true)
{
//receiveing data from the bridge
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
String sentence = new String( receivePacket.getData());
System.out.println("S:RECEIVED: " + sentence);
InetAddress IPAddress = InetAddress.getByName("localhost");
// Sending data to the bridge
int port = 4000;
String capitalizedSentence = sentence.toUpperCase();
sendData = capitalizedSentence.getBytes();
DatagramPacket sendPacket =
new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
}
}
}
桥
import java.io.*;
import java.net.*;
/**
* Write a description of class Bridge here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Bridge
{
public static void main(String args[]) throws Exception{
DatagramSocket bridgeSocket1 = new DatagramSocket(4000);
DatagramSocket bridgeSocket2 = new DatagramSocket();
byte[] receiveData = new byte[1024];
byte[] sendData = new byte[1024];
DatagramPacket receivePacket;
DatagramPacket sendPacket;
InetAddress IPAddress = InetAddress.getByName("localhost");
while(true){
//Receiveing data from the UDPClient
receivePacket = new DatagramPacket(receiveData, receiveData.length);
bridgeSocket1.receive(receivePacket);
//Sending data to UDPServer
String sentence = new String(receivePacket.getData());
System.out.println("B: Data Received:" + sentence);
int port = 5000;
sendData = sentence.getBytes();
sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
bridgeSocket2.send(sendPacket);
// Receiving Data from the UDPServer
receivePacket = new DatagramPacket(receiveData,receiveData.length);
bridgeSocket1.receive(receivePacket);
String capitalizedSentence = new String(receivePacket.getData());
System.out.println("Capitalized Sentence in the Bridge Class: " + capitalizedSentence);
//Sending data to the UDPClient
sendData = capitalizedSentence.getBytes();
sendPacket = new DatagramPacket(sendData,sendData.length,IPAddress,5000);
bridgeSocket2.send(sendPacket);
}
}
}
答案 0 :(得分:0)
您正在将响应从服务器发送回服务器,因为您使用端口get "/second" do
作为目标端口。但是服务器在get "/second/" do
而不是客户端上运行。您还必须将客户端分配给端口,并将从服务器收到的消息发送回已定义端口上的客户端。
现在您的序列如下:
5000
但是它应该看起来像这样:
5000
(假设您的客户端正在监听端口4500)