用JAVA编写一个客户机服务器聊天程序

服务器端（注意要先启动服务器端）

import javaio;
import javanet;
import javaawt;
import javaawtevent;

public class server extends Frame implements ActionListener {
Label label = new Label("交谈内容");
Panel panel = new Panel();
TextField tf = new TextField(10);
TextArea ta = new TextArea();
ServerSocket server;
Socket client;
InputStream in;
OutputStream out;

public server() {
super("服务器");
setSize(250, 250);
paneladd(label);
paneladd(tf);
tfaddActionListener(this);
add("North", panel);
add("Center", ta);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
Systemexit(0);
}
});
show();
try {
server = new ServerSocket(4000);
client = serveraccept();
taappend("客户机是：" + clientgetInetAddress()getHostName() + "\n\n");
in =clientgetInputStream();
out= clientgetOutputStream();
} catch (IOException ioe) {
}
while (true) {
try {
byte[] buf = new byte[256];
inread(buf);
String str = new String(buf);
taappend("客户机说：" + str + "\n\n");
} catch (IOException e) {
}
}
}

public void actionPerformed(ActionEvent e) {
try {
String str = tfgetText();
byte[] buf = strgetBytes();
tfsetText(null);
outwrite(buf);
taappend("我说：" + str + "\n");
} catch (IOException ioe) {
}
}

public static void main(String[] args) {
new server();
}
}

客户端

import javaio;
import javanet;
import javaawt;
import javaawtevent;

public class client extends Frame implements ActionListener {
Label label = new Label("交谈内容");
Panel panel = new Panel();
TextField tf = new TextField(10);
TextArea ta = new TextArea();
Socket client;
InputStream in;
OutputStream out;

public client() {
super("客户机");
setSize(250, 250);
paneladd(label);
paneladd(tf);
tfaddActionListener(this);
add("North", panel);
add("Center", ta);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
Systemexit(0);
}
});
show();
try {
client = new Socket(InetAddressgetLocalHost(), 4000);
taappend("服务器是：" + clientgetInetAddress()getHostName() + "\n\n");
in = clientgetInputStream();
out = clientgetOutputStream();
} catch (IOException ioe) {
}
while (true) {
try {
byte[] buf = new byte[256];
inread(buf);
String str = new String(buf);
taappend("服务器说：" + str + "\n");
} catch (IOException e) {
}
}
}

public void actionPerformed(ActionEvent e) {
try {
String str = tfgetText();
byte[] buf = strgetBytes();
tfsetText(null);
outwrite(buf);
taappend("我说：" + str + "\n");
} catch (IOException iOE) {
}
}

public static void main(String args[]) {
new client();
}
}

这个只能在自己一台电脑上先启动服务器再启动客户端才行，要想一台机子启动服务器端一台机子启动客户端需要把客户端的 client = new Socket(InetAddressgetLocalHost(), 4000);改成 client = new Socket("服务器Ip", 4000);(前提是两台机子连在局域网里面的)