源代码：
ChatServer.java
import java.io.DataInputStream;
import java.io.IOException;
import java.net.*;
public class ChatServer {
public static void main(String[] args) {
boolean started = false;
try {
ServerSocket ss = new ServerSocket(8888);
started = true;
while(true)
{
Socket s = new Socket();
s = ss.accept();
System.out.println("a client connected!!!");
DataInputStream dis = new DataInputStream (s.getInputStream());
String str = dis.readUTF();
System.out.println(str);
//dis.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
ChatClient.java
import java.awt.*;
import java.io.*;
import java.net.*;
import java.awt.event.*;
public class ChatClient extends Frame {
//成员变量
Socket s = null;
TextField tfInput = new TextField();
TextArea taDisplay = new TextArea();
DataOutputStream dos = null;
public static void main(String[] args) {
new ChatClient().launchFrame();
}
//新建launchFrame方法建立窗口
private void launchFrame()
{
setLocation(400,300);
setSize(300,300);
tfInput.addActionListener(new InputListener());
add(tfInput,BorderLayout.SOUTH);
add(taDisplay,BorderLayout.NORTH);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e) {
Disconnect();
System.exit(0);
}
});
pack();
setVisible(true);
Connect();
}
//断开连接方法
public void Disconnect()
{
try {
dos.close();
s.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//定义输入框监听器类
private class InputListener implements ActionListener
{
public void actionPerformed(ActionEvent e) {
String str = null;
str = tfInput.getText();
taDisplay.append(str+"\n");
tfInput.setText("");
try {
dos.writeUTF(str);
dos.flush();
//dos.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
//单独建立一个方法，用于连接到服务器
private void Connect()
{
try {
s = new Socket ("127.0.0.1",8888);
dos = new DataOutputStream(s.getOutputStream());
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
[code="java"]
while(true)
{
Socket s = new Socket();
s = ss.accept();
System.out.println("a client connected!!!");
DataInputStream dis = new DataInputStream (s.getInputStream());
String str = dis.readUTF();
System.out.println(str);
}
[/code]
服务端ss.accept每次接收都是一个新的socket客户端连接, 但是你客户端只创建了一次连接, 所以第二次自然就接收不到, 如果你只是为了做单线程的处理的话, 代码这样改就行了.
[code="java"]
Socket s = new Socket();
s = ss.accept();
System.out.println("a client connected!!!");
DataInputStream dis = new DataInputStream (s.getInputStream());
while(true)
{
String str = dis.readUTF();
System.out.println(str);
}
[/code]
[quote][code="java"]while(true)
{
Socket s = new Socket();
s = ss.accept();
System.out.println("a client connected!!!");
DataInputStream dis = new DataInputStream (s.getInputStream());
String str = dis.readUTF();
System.out.println(str);
//dis.close();
}
} catch (IOException e) {
e.printStackTrace();
} [/code][/quote]
连接没有保持，丢失了。
如果你要多线程例子，我这边有一个：
[url]http://bbjava.iteye.com/blog/1122006[/url]，