Java套接字-读取服务器获取的数据的客户端

Question

I am working on a java socket program and have difulcites with the client part. The server get's what all the clients write, but the client only gets what it writes. Could someone provide me with an example of a client part of a program that gets what all the clients write? Thanks!

Answer 1

Here is an "echo server" example

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

class TCPServer
{
public static void main(String argv[]) throws IOException
{
    ServerSocket serverSocket = null;
    DataInputStream serverInput = null;
    PrintStream serverOutput = null;
    String line = null;
    Socket clientSocket = null;

    // create server socket
    try
    {
        serverSocket = new ServerSocket(2012);
        clientSocket = serverSocket.accept();
        serverInput = new DataInputStream(clientSocket.getInputStream());
        serverOutput = new PrintStream(clientSocket.getOutputStream());
    }
    catch(IOException e){System.out.println(e);}


    // receive data and send it back to the client
    try
    {
        while(true)
        {
            line = serverInput.readLine();
            if(line.equals("exit"))
            {
                break;
            }
            else
            {
                if(!line.equals(null) && !line.equals("exit"))
                {
                    System.out.println("Received " +line);
                    line = line+" MODIFIED";
                    serverOutput.println(line);
                }
            }
        }
    }
    catch(IOException e){System.out.println("SERVER SIDE: Unable send/receive data");}

    try
    {
        serverInput.close();
        serverOutput.close();
        clientSocket.close();
        serverSocket.close();
    }
    catch(IOException e){System.out.println(e);}
}
}

Here is the client

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

public class TCPClient
{
public static void main(String[] args) throws IOException 
{

    Socket echoSocket = null;
    PrintWriter out = null;
    BufferedReader in = null;

    try {
        echoSocket = new Socket("localhost", 2012);
        out = new PrintWriter(echoSocket.getOutputStream(), true);
        in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
    } catch (UnknownHostException e) {
        System.err.println("Don't know about host");
        System.exit(1);
    } catch (IOException e) {
        System.err.println("Couldn't get I/O");
        System.exit(1);
    }

BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
String userInput;

while ((userInput = stdIn.readLine()) != null) {
    out.println(userInput);
    System.out.println("echo: " + in.readLine());
    if(userInput.equals("exit"))
    break;
}

out.close();
in.close();
stdIn.close();
echoSocket.close();
}
}