简单的TCP聊天程序

[imonkeyi]

没错误，但运行不对，不知道哪里出问题了
package cn.itcast.chapter11;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;

public class test1 extends JFrame implements ActionListener,WindowListener{

static final int PORT=6699;//服务端端口号
static final String IP="172.27.80.187";//服务端IP地址
Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();//获取屏幕尺寸，使窗口居中
JTextArea area=new JTextArea();//文本域，用于放信息
JTextField tfield=new JTextField(45);//文本框，用于放要发的信息
JButton but=new JButton("确定");
JPanel panel=new JPanel();
JLabel label=new JLabel("信息");
static Socket client;

static {//先用服务端的IP地址和端口号实例化socket
try {
client=new Socket(IP,PORT);
}catch(Exception e) {
e.printStackTrace();
}
}

test1(){//构造函数，设置界面
setSize(640,420);
setLocation(screen.width/2-320,screen.height/2-210);
area.setLineWrap(true);
setTitle("客户端");
area.setEditable(false);

panel.add(label);
panel.add(tfield);
panel.add(but);

add(area,BorderLayout.CENTER);
add(panel,BorderLayout.SOUTH);
but.addActionListener(this);
tfield.addActionListener(this);

setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
setVisible(true);
}

public void actionPerformed(ActionEvent e) {//按确定时发信息给服务端并显示在文本域中
//String receiveMsg;
String sendMsg;
sendMsg=tfield.getText();
try {
//client=new Socket(IP,PORT);
//DataInputStream dis=new DataInputStream(client.getInputStream());
DataOutputStream dos=new DataOutputStream(client.getOutputStream());
if(sendMsg!="") {

String atext=area.getText();
String ftext="你发的信息"+tfield.getText()+"\r\n";
area.setText(atext+ftext);
dos.writeUTF(tfield.getText());
dos.close();
}
/*receiveMsg=dis.readUTF();

if(receiveMsg!="") {
area.setText(receiveMsg);
}


close(client);*/

}catch(Exception IO) {
IO.printStackTrace();
}

tfield.setText("");
}

/*public void close(Socket client)throws Exception {
client.getOutputStream().close();
client.getInputStream().close();
client.close();
}*/
public void receiveMsg() {//收信息函数，当有信息是显示在文本域中
String reMsg;
String Msg;
Msg=area.getText();
try {
InputStream is=client.getInputStream();
DataInputStream dis=new DataInputStream(is);
reMsg="接受到信息："+dis.readUTF()+"\r\n";
if(reMsg!="") {
area.setText(Msg+reMsg);
}
is.close();
}catch(Exception e) {
e.printStackTrace();
}
}

public void windowClosing(WindowEvent e) {//关闭窗口时关闭socket
try {
client.close();
}catch(Exception e1) {
e1.printStackTrace();
}
Window window=e.getWindow();
window.dispose();
}
public void windowClosed(WindowEvent e) {}
public void windowOpened(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}

public static void main(String[] args) {//主函数，实例化自己，调用收信息函数收信息
test1 test=new test1();
test.receiveMsg();
}
}

package cn.itcast.chapter11;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;

public class test3 extends JFrame implements ActionListener,WindowListener{
	
	static final int PORT=6699;//定义服务端的端口号
	Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();//获取屏幕尺寸使窗口居中
	JTextArea area=new JTextArea();
	JTextField tfield=new JTextField(45);
	JButton but=new JButton("确定");
	JPanel panel=new JPanel();
	JLabel label=new JLabel("信息");
	static ServerSocket server;
	static Socket client;
	
	static {//静态代码块，先实例化serversocket并得到socket
		try {
		server=new ServerSocket(PORT);
		client=server.accept();
		}catch(Exception e) {
			e.printStackTrace();
		}
	}

	test3(){//构造函数，设置界面
		setSize(640,420);
		setLocation(screen.width/2-320,screen.height/2-210);
		area.setLineWrap(true);
		setTitle("服务端");
	    area.setEditable(false);
		
		panel.add(label);
		panel.add(tfield);
		panel.add(but);
		
		add(area,BorderLayout.CENTER);
		add(panel,BorderLayout.SOUTH);
		but.addActionListener(this);
		tfield.addActionListener(this);
		
		setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		setVisible(true);
	}
	
    public void actionPerformed(ActionEvent e) {//按确定时发信息给服务端并显示在文本域中
    	String receiveMsg;
    	String sendMsg;
    	sendMsg=tfield.getText();
    	try {
        //server=new ServerSocket(PORT);
        //Socket client=server.accept();
    	//DataInputStream dis=new DataInputStream(client.getInputStream());
    	DataOutputStream dos=new DataOutputStream(client.getOutputStream());
    	if(sendMsg!="") {
    		
    		String atext=area.getText();
        	String ftext=tfield.getText()+"\r\n";
        	area.setText(atext+ftext);
        	dos.writeUTF(tfield.getText());
        	
    	}
    	/*receiveMsg=dis.readUTF();
    	
    	if(receiveMsg!="") {
        	area.setText(receiveMsg);
        	}
    	//close(client);*/
    	}catch(Exception IO) {
    		IO.printStackTrace();
    	}
    	
    	tfield.setText("");
    }
    public void receiveMsg() {//收信息函数，当有信息是显示在文本域中
    	String reMsg,Msg;
    	Msg=area.getText();
    	try {
    	InputStream is=client.getInputStream();
    	DataInputStream dis=new DataInputStream(is);
    	reMsg="接受到信息："+dis.readUTF()+"\r\n";
    	if(reMsg!="") {
    		area.setText(Msg+reMsg);
    	}
    	is.close();
    	}catch(Exception e) {
    		e.printStackTrace();
    	}
    }
    
    public void windowClosing(WindowEvent e) {//关闭窗口时关闭socket
    	try {
			client.close();
			server.close();
		}catch(Exception e1) {
			e1.printStackTrace();
		}
    	Window window=e.getWindow();
    	window.dispose();
    }
    public void windowClosed(WindowEvent e) {}
    public void windowOpened(WindowEvent e) {}
    public void windowIconified(WindowEvent e) {}
    public void windowDeiconified(WindowEvent e) {}
    public void windowActivated(WindowEvent e) {}
    public void windowDeactivated(WindowEvent e) {}
    /*public void close(Socket client)throws Exception {
    	client.getOutputStream().close();
    	client.getInputStream().close();
    	client.close();
    }*/
	public static void main(String[] args) {//主函数，实例化自己，调用收信息函数收信息
		test3 test=new test3();
		test.receiveMsg();
	}
}

[tianfang]

先写好一端的代码，比如server端。然后使用telnet ip port方式进行测试，再去写客户端 两个教程： https://www.cise.ufl.edu/~amyles/tutorials/tcpchat/ http://surajzanvar.blogspot.com/p/echo-server-with-gui-in-java-client.html