我有一个客户端 - 服务器通信代码。但是，我实际上希望多个客户端与服务器进行通信而不是其他客户端，我该如何实现呢？
// This is server code:
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class ServerFile extends JFrame {
private JTextField usertext;
private JTextArea chatwindow;
private ObjectOutputStream output;
private ObjectInputStream input;
private ServerSocket server;
private Socket connection;
public ServerFile() {
super("Admin");
usertext = new JTextField();
usertext.setEditable(false);
usertext.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
sendmessage(event.getActionCommand());
usertext.setText("");
}
});
add(usertext, BorderLayout.SOUTH);
chatwindow = new JTextArea();
add(new JScrollPane(chatwindow));
setSize(300, 250);
setVisible(true);
}
public void startrunning() {
try {
server = new ServerSocket(6789, 100);
while (true) {
try {
waitForConnection();
setupstream();
whilechatting();
} catch (Exception e) {
System.out
.println("\nYou have an error in conversation with client");
} finally {
closecrap();
}
}
} catch (Exception e) {
System.out.println("\nYou have an error in connecting with client");
}
}
private void waitForConnection() throws IOException {
showmessage("\nWaiting for someone to connect");
connection = server.accept();
showmessage("\nNow connected to "
+ connection.getInetAddress().getHostName());
}
private void setupstream() throws IOException {
output = new ObjectOutputStream(connection.getOutputStream());
output.flush();
input = new ObjectInputStream(connection.getInputStream());
showmessage("\nStreams are setup");
}
private void whilechatting() throws IOException {
String message = "\nYou are now connected ";
sendmessage(message);
ableToType(true);
do {
try {
message = (String) input.readObject();
showmessage(message);
} catch (Exception e) {
System.out.println("\nError in reading message");
}
} while (!message.equals("CLIENT-END"));
}
private void closecrap() {
showmessage("\nClosing connection");
ableToType(false);
try {
output.close();
input.close();
connection.close();
} catch (Exception e) {
System.out.println("\nError in closing server");
}
}
private void sendmessage(String message) {
try {
chatwindow.append("\nSERVER: " + message);
output.writeObject("\nSERVER: " + message);
output.flush();
} catch (Exception e) {
chatwindow.append("\nError in sending message from server side");
}
}
private void showmessage(final String text) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
chatwindow.append("\n" + text);
}
});
}
private void ableToType(final boolean tof) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
usertext.setEditable(tof);
}
});
}
}
public class Server {
public static void main(String args[]) {
ServerFile server1 = new ServerFile();
server1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
server1.startrunning();
}
}
// and this is the client code:
import javax.swing.JFrame;
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class ClientFile extends JFrame {
private static final long serialVersionUID = 1L;
private JTextField usertext;
private JTextArea chatwindow;
private ObjectOutputStream output;
private ObjectInputStream input;
private String message="";
private String serverIP;
private ServerSocket server;
private Socket connection;
public ClientFile(String host)
{
super("Client");
serverIP=host;
usertext= new JTextField();
usertext.setEditable(false);
usertext.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent event){
sendmessage(event.getActionCommand());
usertext.setText("");
}
}
);
add(usertext,BorderLayout.SOUTH);
chatwindow= new JTextArea();
add(new JScrollPane(chatwindow));
setSize(300,250);
setVisible(true);
}
public void startrunning() {
try {
connecttoserver();
setupstream();
whilechatting();
}
catch(Exception e){
System.out.println("\nYou have an error in coversation with server");
}
finally{
closecrap();
}
}
private void connecttoserver() throws IOException{
showmessage("\nAttempting connection");
connection = new Socket(InetAddress.getByName("127.0.0.1"),6789);
showmessage("\nConnected to "+connection.getInetAddress().getHostName());
}
private void setupstream() throws IOException{
output= new ObjectOutputStream(connection.getOutputStream());
output.flush();
input= new ObjectInputStream(connection.getInputStream());
showmessage("\nStreams are good to go");
}
private void whilechatting()throws IOException{
ableToType(true);
do {
try{
message = (String)input.readObject();
showmessage(message);
}
catch(Exception e){
System.out.println("\nError in writing message");
}
} while(!message.equals("SERVER - END"));
}
private void closecrap(){
showmessage("\nClosing....");
ableToType(false);
try{
output.close();
input.close();
connection.close();
}
catch(Exception e){
System.out.println("\nError in closing client");
}
}
private void sendmessage(String message){
try{
chatwindow.append("\nCLIENT: "+message);
output.writeObject("\nCLIENT: "+message);
output.flush();
}
catch(Exception e){
chatwindow.append("\nError in sending message from client side");
}
}
private void showmessage(final String m){
SwingUtilities.invokeLater( new Runnable(){
public void run(){
chatwindow.append("\n"+m);
}});
}
private void ableToType(final boolean tof){
SwingUtilities.invokeLater( new Runnable(){
public void run(){
usertext.setEditable(tof);
}});
}
}
public class Client {
public static void main(String args[])
{
ClientFile obj2= new ClientFile("127.0.0.1");
obj2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
obj2.startrunning();
}
}
应用多线程是一个很好的解决方案，但是当我应用时，只在一个客户端和一个服务器之间建立了连接..请帮我这样做
答案 0 :(得分：2)
应用多线程是一个很好的解决方案，但是当我应用时，只在一个客户端和一个服务器之间建立了连接..请帮我这样做
我没有通过（并因此检查）你的所有代码，但我注意到了一件事：
在startrunning()函数中：
setupstream() whilechatting() 所以在那里，您将只获得一个新连接，以便设置其流并进行聊天。你只能有一个线程服务于你的客户端，所以只有第一个到达的线程才会被服务，直到它释放线程，以便另一个线程可以连接。
你应该这样做：
setupstream() whilechatting() 每个客户端都会产生自己的舒适线程，而主线程处于无限循环中等待新客户端。
HTH