udp服务器监听（多线程）
项目一：udp1111
监听的有三个文件分别为：
guiHello.java 有关界面和事件响应功能
UdpFunc.java是udp类的封装:发送和接收
udpServer.java是入口函数，无实际意义
代码：
import java.awt.*; import java.awt.event.*; import java.io.*; import java.util.Scanner; import javax.swing.*; import javax.swing.border.Border; import javax.swing.border.LineBorder; //// import java.net.DatagramSocket; import java.net.DatagramPacket; import java.net.InetAddress; public class guiHello extends JFrame implements ActionListener { private static UdpFunc func; //全局变量：调用udp类的实例化 private static boolean status; //侦听状态改变标志位 private static JLabel label = new JLabel("192.168.0.3:5050"); private static JTextArea ta=new JTextArea(30,80); private JFileChooser jfc=new JFileChooser(new File(".")); private JButton bOpen,bSave; private JButton bListen,bOk,bStop; public guiHello() { super("UDP监听GUI"); JScrollPane ps=new JScrollPane(ta); bOpen=new JButton("选取源文件"); bSave=new JButton("保存变量"); bListen = new JButton("开始监听"); //这个是自定义的按钮 bOk = new JButton("测试按钮"); //自定义两个 JPanel JPanel panel1 = new JPanel(new BorderLayout()); JPanel panel2 = new JPanel(new BorderLayout()); //两个panel第二个背景为红色 panel2.setBackground(Color.red); //panel1.add(bStop, BorderLayout.WEST); panel1.add(bListen, BorderLayout.CENTER); add(panel1); panel2.add(label, BorderLayout.EAST); add(panel2); setLayout(new FlowLayout(FlowLayout.CENTER,10,15)); add(ps); add(bOpen); add(bSave); // add(bListen); add(bOk); Border b = new LineBorder(Color.ORANGE, 2); bListen.setBorder(b); bOpen.addActionListener(this); bSave.addActionListener(this); bListen.addActionListener(this); bOk.addActionListener(this); setVisible(true); setSize(1600,1500); } /* public static void main(String[] args) { // TODO Auto-generated method stub guiHello frm=new guiHello(); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } */ public void actionPerformed(ActionEvent e) { JButton jbt=(JButton)e.getSource(); if(jbt==bOpen) { int status=jfc.showOpenDialog(this); if(status!=JFileChooser.APPROVE_OPTION) ta.setText("没有选择文件"); else { try{ File file1=jfc.getSelectedFile(); Scanner scan=new Scanner(file1); String info=""; while(scan.hasNext()) { String str=scan.nextLine(); info+=str+"\r\n"; } scan.close(); ta.setText(info); } catch(FileNotFoundException ex){ } } }else if(jbt==bSave){ Save(); }else if(jbt==bListen){ ta.setText("开始监听..."); status =true; //开始监听时为truejbt==bStop func = new UdpFunc(5050); new Thread(new Logic()).start(); }else if(e.getActionCommand().equals("测试按钮")){ ta.setText("按钮bOk"); }else{ ta.setText("未注册变量"); } } //每个按钮对应的函数 private static void Save(){ ta.setText("保存的按钮"); } /* * 逻辑类，主要负责接收报文并显示出来 * * @author ghost * */ private static class Logic implements Runnable { public void run() { //由于类为static，所以监听标志位也为静态变量，根据true flase决定监听线程是否一直开启 while (true) { String message = func.read(); //System.out.println(message); ta.setText(message); } } } }
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 UdpFunc { DatagramSocket udp; /** * 在指定端口监听udp消息 * @param port */ UdpFunc(int port) { try { udp=new DatagramSocket(port); } catch (SocketException e) { e.printStackTrace(); } } /** * 向指定的ip地址的端口发送消息 * @param message 要发送的消息 * @param port 指定的端口 * @param ip 指定的ip地址 */ void send(String message,int port,String ip) { try { byte temp[]=message.getBytes(); InetAddress address=InetAddress.getByName(ip); DatagramPacket send_packet=new DatagramPacket(temp,temp.length,address,port); udp.send(send_packet); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 从端口读取报文并返回报文数据 * @return 报文数据 */ String read() { byte temp[]=new byte[2048]; DatagramPacket receive_packet=new DatagramPacket(temp,temp.length); try { udp.receive(receive_packet); } catch (IOException e) { e.printStackTrace(); } String result=new String(receive_packet.getData(),0,receive_packet.getLength()); return result; } }
import javax.swing.JFrame; public class udpServer { /** * @param args */ public static void main(String[] args) { // 开启GUI面板，打开侦听函数 guiHello frm=new guiHello(); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }
项目二：udpChat
参考代码：
一个简易的udp聊天工具：
UdpFunc.java 是udp类的封装:发送和接收
UdpGui.java GUI及对数据处理
代码：
package com.ghost.chat.udp; 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 UdpFunc { DatagramSocket udp; /** * 在指定端口监听udp消息 * @param port */ UdpFunc(int port) { try { udp=new DatagramSocket(port); } catch (SocketException e) { e.printStackTrace(); } } /** * 向指定的ip地址的端口发送消息 * @param message 要发送的消息 * @param port 指定的端口 * @param ip 指定的ip地址 */ void send(String message,int port,String ip) { try { byte temp[]=message.getBytes(); InetAddress address=InetAddress.getByName(ip); DatagramPacket send_packet=new DatagramPacket(temp,temp.length,address,port); udp.send(send_packet); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * 从端口读取报文并返回报文数据 * @return 报文数据 */ String read() { byte temp[]=new byte[2048]; DatagramPacket receive_packet=new DatagramPacket(temp,temp.length); try { udp.receive(receive_packet); } catch (IOException e) { e.printStackTrace(); } String result=new String(receive_packet.getData(),0,receive_packet.getLength()); return result; } }
package com.ghost.chat.udp; import java.awt.BorderLayout; import java.awt.List; 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.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.JTextField; public class UdpGui extends JFrame { /** * */ private static final long serialVersionUID = 1L; private JTextField jtf_port; //服务器端口（也就是启动监听时服务器开的端口) private JTextField jtf_other_port; //other表示发送给一个电脑：端口为：jtf_other_port private JTextField jtf_other_ip; // ip为：jtf_other_ip private JButton btn_start; private JTextArea jta_message; private JTextField jtf_message; private JButton btn_send; private List jl_list; private UdpFunc func; private boolean status; UdpGui() { super("UDP"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); guiInitialization(); actionInitialization(); this.setVisible(true); } /** * 注册事件响应函数 */ private void actionInitialization() { jtf_message.setEditable(false); btn_send.setEnabled(false); jl_list.setVisible(false); btn_start.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("start")) { int port = Integer.parseInt(jtf_port.getText()); func = new UdpFunc(port);//服务器端口 status = true; new Thread(new Logic()).start(); postMessage("启动UDP服务器(" + port + ")"); btn_start.setText("stop"); jtf_port.setEditable(false); jtf_other_ip.setEditable(false); jtf_other_port.setEditable(false); jtf_message.setEditable(true); btn_send.setEnabled(true); } else if (e.getActionCommand().equals("stop")) { status = false; postMessage("服务器已经停止运行"); btn_start.setText("start"); jtf_port.setEditable(true); jtf_other_ip.setEditable(true); jtf_other_port.setEditable(true); jtf_message.setText(""); jtf_message.setEditable(false); btn_send.setEnabled(false); } else { postMessage("发生未注册事件,请验证程序是否被修改"); } } }); btn_send.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("send")) { String message = jtf_message.getText(); if (message.trim().equalsIgnoreCase("")) { postMessage("警告:" + "你不能发送空字符串"); } else { func.send(message, Integer.parseInt(jtf_other_port.getText()),//发送给客户机，需指定端口和IP jtf_other_ip.getText()); postMessage("我:" + message); } jtf_message.setText(""); jtf_message.requestFocus(); } else { postMessage("发生未注册事件,请验证程序是否被修改"); } } }); jtf_message.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String message = jtf_message.getText(); if (message.trim().equalsIgnoreCase("")) { postMessage("警告:" + "你不能发送空字符串"); } else { func.send(message, Integer.parseInt(jtf_other_port.getText()), jtf_other_ip.getText()); postMessage("自己:" + message); } jtf_message.setText(""); jtf_message.requestFocus(); } }); } /** * 得到当前系统时间 * * @return 当前系统时间 */ String getTime() { Date date = new Date(); SimpleDateFormat formater = new SimpleDateFormat("HH:mm:ss"); return formater.format(date); } /** * 向GUI界面递送显示的消息 * * @param message * 要显示在界面上的消息(会自动加上当前系统时间) */ void postMessage(String message) { if (jta_message.getLineCount() > 500) { jta_message.setText("time:" + getTime() + " " + "消息过多，执行自动清理...\n"); } jta_message.append("time:" + getTime() + " " + message + "\n"); jta_message.requestFocus(); jta_message.setCaretPosition(jta_message.getText().length()); } /** * 初始化界面 */ private void guiInitialization() { this.setSize(800, 600); this.setLocation(400, 200); this.setResizable(false); JPanel container = new JPanel(); this.add(container); container.setLayout(new BorderLayout()); JPanel header = new JPanel(); header.add(new JLabel("服务器端口:")); jtf_port = new JTextField("5050", 4); header.add(jtf_port); header.add(new JLabel("待发送客户机端口:")); jtf_other_port = new JTextField("5000", 4); header.add(jtf_other_port); header.add(new JLabel("待发送客户机IP:")); jtf_other_ip = new JTextField("192.168.1.108", 10); //127.0.0.1 header.add(jtf_other_ip); btn_start = new JButton("start"); header.add(btn_start); JPanel main = new JPanel(); jta_message = new JTextArea(); jta_message.setAutoscrolls(true); jta_message.setEditable(false); JScrollPane scorllPanel = new JScrollPane(jta_message); scorllPanel .setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); scorllPanel .setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED); main.setLayout(new BorderLayout()); main.add(scorllPanel, BorderLayout.CENTER); JPanel bottom = new JPanel(); jtf_message = new JTextField("", 25); btn_send = new JButton("send"); bottom.add(new JLabel("Send:")); bottom.add(jtf_message); bottom.add(btn_send); JPanel right = new JPanel(); right.setLayout(new BorderLayout()); jl_list = new List(); right.add(jl_list, BorderLayout.CENTER); container.add(header, BorderLayout.NORTH); container.add(main, BorderLayout.CENTER); container.add(bottom, BorderLayout.SOUTH); container.add(right, BorderLayout.EAST); } /** * 逻辑类，主要负责接收报文并显示出来 * * @author ghost * */ private class Logic implements Runnable { public void run() { while (status) {//true String message = func.read(); System.out.println(message); postMessage("对方：" + message); } } } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub new UdpGui(); } }
自己利用项目一作为服务器，项目二作为客户端（实际上，也可以作为服务器），发送检验：
代码，上传上来，项目名为udp1111,udpchat,以供后续使用
