[英]Java simple server client
我正在用Java開發一個簡單的線程服務器客戶端消息傳遞應用程序。 我的問題是,當客戶端打開時,服務器會收到消息,但僅將消息回顯給發送消息的客戶端,而不回顯其他客戶端。 我如何將其發送到連接到服務器的所有客戶端。
服務器代碼
import java.io.*;
import java.net.*;
public class ThreadedSever
{
private static final int port=5000;
//Threaded Server
public ThreadedSever(){
System.out.println("A multi-threaded server has started...");
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(port);
}catch(Exception e){
System.out.println("Could not create a server socket: " + e);
}
//Chat with the client until breaks connection or says bye
try{
while(true){
System.out.println("Waiting for client communication");
Socket currentSocket = serverSocket.accept();
//Create a new thread to deal with this connection
new ServerThread(currentSocket);
}
}catch(Exception e){
System.out.println("Fatal Server Error!");
}
}
//Inner class to handle individual commincation
private class ServerThread extends Thread{
private Socket sock;
private DataInputStream in = null;
private DataOutputStream out = null;
public ServerThread(Socket sock){
try{
this.sock = sock;
in = new DataInputStream(this.sock.getInputStream());
out = new DataOutputStream(this.sock.getOutputStream());
System.out.print("New client connection established");
out.writeUTF("Type bye to exit, otherwise, prepare to be echoed");
start();
}catch(Exception e){
System.out.println("Oops");
}
}
public void run(){
try{
String what = new String("");
while(!what.toLowerCase().equals("bye")){
what = in.readUTF();
System.out.println("Client told me: " + what);
out.writeUTF(what);
}
}catch(Exception e){
System.out.println("Connection to current client has been broken");
}
finally{
try{
sock.close();
}catch(Exception e){
System.out.println("Error socket could not be closed");
}
}
}
}
public static void main(){
new ThreadedSever();
}
}
客戶代碼
import java.io.*;
import java.net.*;
public class simpleClient
{
private static final int port= 5000;
private static String server = "localhost";
private static Socket socket = null;
private static DataInputStream input = null;
private static DataOutputStream output = null;
private static InputStreamReader inReader = null;
private static BufferedReader stdin = null;
public static void main(){
try{
socket = new Socket(server, port);
}catch(UnknownHostException e){
System.err.println("Unknow IP address for server");
System.exit(-1);
}
catch(IOException e){
System.err.println("No server found at specified port");
System.exit(-1);
}
catch(Exception e){
System.err.println("Something happened!");
System.exit(-1);
}
try{
input = new DataInputStream(socket.getInputStream());
output = new DataOutputStream(socket.getOutputStream());
inReader = new InputStreamReader(System.in);
stdin = new BufferedReader(inReader);
String what = new String("");
String response;
while(!what.toLowerCase().equals("bye")){
// Expect something from the server and output it when it arrives
response = input.readUTF();
System.out.println("Server said \"" + response + "\"");
//Read a line from the user and send it to the server
what = stdin.readLine();
output.writeUTF(what);
}
}
catch(IOException e){
System.err.println("Broken connection with server");
System.exit(-1);
}
}
}
您可以定義一個方法echoMessage
每個ServerThread
。 每次實例化ServerThread
時,都ServerThread
實例添加到ThreadedSever
的list
中。 而且, ServerThread
ServerThread
接收到數據,還應使ServerThread
成為觀察者 ,然后該觀察者方法應在ServerThread列表中的每個元素上調用echoMessage。
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