UDP群聊

package UDP;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.net.*;

import java.io.IOException;

import java.lang.String;

public class lt extends JFrame{

private static final int DEFAULT_PORT=8899;

private JLabel stateLB;

private JTextArea centerTextArea;

private JPanel southPanel;

private JTextArea inputTextArea;

private JPanel bottomPanel;

private JTextField ipTextField;

private JTextField remotePortTF;

private JButton sendBT;

private JButton clearBT;

private DatagramSocket datagramSoket;

private void setUpUI(){

setTitle("聊天");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setSize(400,400);

setResizable(false);//窗口大小不可改变

setLocationRelativeTo(null);//设置窗口相对于指定组件的位置

stateLB=new JLabel("weijianting");

stateLB.setHorizontalAlignment(JLabel.RIGHT);

centerTextArea=new JTextArea();

centerTextArea.setEditable(false);

centerTextArea.setBackground(new Color(211,211,211));

southPanel=new JPanel(new BorderLayout());

inputTextArea=new JTextArea(5,20);

bottomPanel=new JPanel(new FlowLayout(FlowLayout.CENTER,5,5));

ipTextField=new JTextField("127.0.0.1",8);

remotePortTF=new JTextField(String.valueOf(DEFAULT_PORT),3);

sendBT=new JButton("发送");

clearBT=new JButton("清屏");

bottomPanel.add(ipTextField);

bottomPanel.add(remotePortTF);

bottomPanel.add(sendBT);

bottomPanel.add(clearBT);

southPanel.add(new JScrollPane(inputTextArea),BorderLayout.CENTER);

southPanel.add(bottomPanel,BorderLayout.SOUTH);

add(stateLB,BorderLayout.NORTH);

add(new JScrollPane(centerTextArea),BorderLayout.CENTER);

add(southPanel,BorderLayout.SOUTH);

setVisible(true);

}

private void setListener(){

sendBT.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

final String ipAddress=ipTextField.getText();

final String remotePort=remotePortTF.getText();

if(ipAddress==null||ipAddress.trim().equals("")||remotePort==null||remotePort.trim().equals("")){

JOptionPane.showMessageDialog(lt.this,"请输入IP地址和端口号");

return;

}

if(datagramSoket==null||datagramSoket.isClosed()){

JOptionPane.showMessageDialog(lt.this,"监听未成功");

return;

}

String sendContent=inputTextArea.getText();

byte[] buf=sendContent.getBytes();

try{

centerTextArea.append("我对"+ipAddress+":"+remotePort+"说:\n"+inputTextArea.getText()+"\n\n");

centerTextArea.setCaretPosition(centerTextArea.getText().length());

datagramSoket.send(new DatagramPacket(buf,buf.length,InetAddress.getByName(ipAddress),Integer.parseInt(remotePort)));

inputTextArea.setText("");

}catch(IOException e1){

JOptionPane.showMessageDialog(lt.this, "出错了,发送不成功");

e1.printStackTrace();

}

};

});

clearBT.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

centerTextArea.setText("");

}

});

}

private void initSocket(){

int port=DEFAULT_PORT;

while(true){

try{

if(datagramSoket!=null&&!datagramSoket.isConnected()){

datagramSoket.close();

}

try{

port=Integer.parseInt(JOptionPane.showInputDialog(this,"请输入端口号","端口号",JOptionPane.QUESTION_MESSAGE));

if(port<1||port>65535){

throw new RuntimeException("端口号超出范围");

}

}catch(Exception e){

JOptionPane.showMessageDialog(null,"你输入的端口不正确,请输入1~65535之间的数");

continue;

}

datagramSoket=new DatagramSocket(port);

startListen();

stateLB.setText("已在"+port+"端口监听");

break;

}catch(SocketException e){

JOptionPane.showMessageDialog(this, "端口号被占用,请重新设置端口");

stateLB.setText("当前未启动监听");

}

}

}

private void startListen(){

new Thread(){

private DatagramPacket p;

public void run(){

byte[] buf=new byte[1024];

p=new DatagramPacket(buf,buf.length);

while(!datagramSoket.isConnected()){

try{

datagramSoket.receive(p);

centerTextArea.append(p.getAddress().getHostAddress()+":"+((InetSocketAddress)p.getSocketAddress()).getPort()+"对我说:\n"+new String(p.getData(),0,p.getLength())+"\n\n");

centerTextArea.setCaretPosition(centerTextArea.getText().length());

}catch(IOException e){

e.printStackTrace();

}

}

}

}.start();

}

public static void main(String[] args) {

lt a=new lt();

a.setUpUI();

a.initSocket();

a.setListener();

}

}

相关推荐
悟能不能悟1 小时前
cmd什么命令可以知道本机到目标机的ip节点
网络·网络协议·tcp/ip
cliproxydaili1 小时前
代理IP+账号矩阵:Cliproxy与TGX Account如何赋能品牌全球化表达?
网络协议·tcp/ip·矩阵
六点半8881 小时前
【计算机网络】初识网络(TCP / IP五层模型 + 网络协议栈和操作系统关系 + 网络传输基本流程 + 数据包封装和分用)
网络·计算机网络
小亮亮虫1 小时前
LwIP UDP RAW
单片机·网络协议·udp
风清再凯2 小时前
03-docker存储与网络
网络·docker·容器
会开花的二叉树3 小时前
分布式文件存储 RPC 服务实现
c++·分布式·网络协议·rpc
九河云3 小时前
在云计算环境中实施有效的数据安全策略
大数据·网络·数据库·云计算
半路_出家ren4 小时前
Shell脚本基础应用
linux·网络·shell
知白守黑2674 小时前
keepalived
网络