Java基于UDP用Socket实现点对点聊天
核心代码比较简单,基于UDP的聊天实现,采用读，写分离，用不同的线程实现。
主要实现类为
DatagramSocket()与DatagramPacket()，默认端口为8009，Ip地址需要自己输入。Reader线程：
package com.java.gui;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class Reader {
private DatagramSocket ds = null;
private DatagramPacket dp = null;
//private String string = null;
public void run()
{
byte reader[] = new byte[1024];
try { ds = new DatagramSocket(8009);
dp = new DatagramPacket(reader, 1024);
String jieshou = null; ds.receive(dp);
jieshou = new String(dp.getData(), 0, dp.getLength());
System.out.println(jieshou);
app1.fanhui = jieshou;
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally
{
if(ds != null)
{
ds.close();
}
}
}
}
package com.java.gui;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
public class Write extends Thread{
private String string = null;
private String address = null;
public Write(String string, String address)
{
this.address = address;
this.string = string;
}
public void run()
{
DatagramSocket ds = null;
DatagramPacket dp = null;
//byte write[] = new byte[1024];
try {
//设置目标主机
ds = new DatagramSocket();
// byte test[] = null;
// test = string.getBytes();
dp = new DatagramPacket(string.getBytes(), string.getBytes().length, InetAddress.getByName(address),8009);
//发送消息
ds.send(dp);
ds.close();
System.out.println("成功发送！");
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
下面是界面代码,用到了windowBuilder插件:
package com.java.gui;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
public class app1 {
static String fanhui =null;
private static String address = null;
private JFrame frmTest;
private JTextField textField;
private static JTextArea textArea;
private static Date date = null;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
app1 window = new app1();
window.frmTest.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
while(true)
{
new Reader().run();
if(fanhui != null)
{
SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss");
date = new Date();
String form = null;
form = format.format(date);
textArea.append("from"+address+" ("+form+") "+ ":\n"+" "+fanhui+"\n");
}
}
}
/**
* Create the application.
*/
public app1() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmTest = new JFrame();
frmTest.setTitle("test");
frmTest.setBounds(100, 100, 492, 391);
frmTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmTest.getContentPane().setLayout(null);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(10, 10, 261, 202);
frmTest.getContentPane().add(scrollPane);
textArea = new JTextArea();
textArea.setLineWrap(true);
textArea.setEditable(false);
textArea.setColumns(20);
scrollPane.setViewportView(textArea);
JScrollPane scrollPane_1 = new JScrollPane();
scrollPane_1.setBounds(10, 225, 261, 86);
frmTest.getContentPane().add(scrollPane_1);
JTextArea textArea_1 = new JTextArea();
scrollPane_1.setViewportView(textArea_1);
JButton button = new JButton("\u53D1\u9001");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//监听发送按钮
String string = null;
string = textArea_1.getText();
if(address == null)
{
JOptionPane.showMessageDialog(frmTest, "主机号为空!", "提示" , JOptionPane.INFORMATION_MESSAGE);
textArea_1.setText("");
}
else if( !(string.equals("")) && string != null )
{
SimpleDateFormat format = new SimpleDateFormat("hh:mm:ss");
date = new Date();
String form = null;
form = format.format(date);
new Write(string, address).start();
textArea.append("from"+address+" ("+form+") "+ ":\n"+" "+string+"\n");
textArea_1.setText("");
}
else
{
JOptionPane.showMessageDialog(frmTest, "发送内容不能空!", "提示" , JOptionPane.INFORMATION_MESSAGE);
}
//textArea.setText(string);
}
});
button.setBounds(295, 288, 93, 23);
frmTest.getContentPane().add(button);
JLabel lblTest = new JLabel("\u672A\u8FDE\u63A5");
lblTest.setHorizontalAlignment(SwingConstants.CENTER);
lblTest.setBounds(328, 178, 93, 23);
frmTest.getContentPane().add(lblTest);
textField = new JTextField();
textField.setBounds(295, 97, 171, 23);
frmTest.getContentPane().add(textField);
textField.setColumns(10);
JButton btnNewButton = new JButton("\u8FDE\u63A5\u4E3B\u673A");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//监听IP地址输入按钮
String string = textField.getText();
if(string == null)
{
JOptionPane.showMessageDialog(frmTest, "主机号为空!", "提示" , JOptionPane.INFORMATION_MESSAGE);
}
else if((string.matches("^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$") == false))
{
JOptionPane.showMessageDialog(frmTest, "Ip地址格式错误！!", "提示" , JOptionPane.INFORMATION_MESSAGE);
}
else
{
lblTest.setText("连接成功！");
address = string;
}
}
});
btnNewButton.setBounds(328, 138, 93, 23);
frmTest.getContentPane().add(btnNewButton);
}
}
以下为界面图片:
下面是执行图片，由于在本机测试，所以会有重复出现的内容，即自己发送显示一遍，接收显示一遍
