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Java UDP数据报发送与接收 学习
java中DatagramPacket表示存放数据的数据报，DatagramSocket表示接受或发送数据报的套接字。
这两个类所有构成的网络链接是基于UDP协议的。
import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;public class Sender { public static void main(String[] args) { try { // 创建发送方的套接字，IP默认为本地，端口号随机 DatagramSocket sendSocket = new DatagramSocket(); // 确定要发送的消息： String mes = "你好！接收方！"; // 由于数据报的数据是以字符数组传的形式存储的，所以传转数据 byte[] buf = mes.getBytes(); // 确定发送方的IP地址及端口号，地址为本地机器地址 int port = 8888; InetAddress ip = InetAddress.getLocalHost(); // 创建发送类型的数据报： DatagramPacket sendPacket = new DatagramPacket(buf, buf.length, ip, port); // 通过套接字发送数据： sendSocket.send(sendPacket); // 确定接受反馈数据的缓冲存储器，即存储数据的字节数组 byte[] getBuf = new byte[1024]; // 创建接受类型的数据报 DatagramPacket getPacket = new DatagramPacket(getBuf, getBuf.length); // 通过套接字接受数据 sendSocket.receive(getPacket); // 解析反馈的消息，并打印 String backMes = new String(getBuf, 0, getPacket.getLength()); System.out.println("接受方返回的消息：" + backMes); // 关闭套接字 sendSocket.close(); } catch (Exception e) { e.printStackTrace(); } }}import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.SocketAddress;public class Receive { public static void main(String[] args) { try { // 确定接受方的IP和端口号，IP地址为本地机器地址 InetAddress ip = InetAddress.getLocalHost(); int port = 8888; // 创建接收方的套接字,并制定端口号和IP地址 DatagramSocket getSocket = new DatagramSocket(port, ip); // 确定数据报接受的数据的数组大小 byte[] buf = new byte[1024]; // 创建接受类型的数据报，数据将存储在buf中 DatagramPacket getPacket = new DatagramPacket(buf, buf.length); // 通过套接字接收数据 getSocket.receive(getPacket); // 解析发送方传递的消息，并打印 String getMes = new String(buf, 0, getPacket.getLength()); System.out.println("对方发送的消息：" + getMes); // 通过数据报得到发送方的IP和端口号，并打印 InetAddress sendIP = getPacket.getAddress(); int sendPort = getPacket.getPort(); System.out.println("对方的IP地址是：" + sendIP.getHostAddress()); System.out.println("对方的端口号是：" + sendPort); // 通过数据报得到发送方的套接字地址 SocketAddress sendAddress = getPacket.getSocketAddress(); // 确定要反馈发送方的消息内容，并转换为字节数组 String feedback = "接收方说：我收到了！"; byte[] backBuf = feedback.getBytes(); // 创建发送类型的数据报 DatagramPacket sendPacket = new DatagramPacket(backBuf, backBuf.length, sendAddress); // 通过套接字发送数据 getSocket.send(sendPacket); // 关闭套接字 getSocket.close(); } catch (Exception e) { e.printStackTrace(); } }}
import java.io.*;import java.net.*;import java.awt.*;import java.awt.event.*;public class WC7 extends Frame implements ActionListener,Runnable{ DatagramSocket D; byte dataBuf[] = new byte[512]; InetAddress A; DatagramPacket Pac = new DatagramPacket(dataBuf,dataBuf.length); TextArea T1 = new TextArea(); TextField T2 = new TextField(23); public WC7() { add(T1,"Center"); Panel P = new Panel(); P.add(new Label ("发送的信息")); P.add(T2); T2.addActionListener(this); add(P,"South"); setSize(350,200); setVisible(true); setTitle("WC7"); addWindowListener (new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); (new Thread (this)).start(); } public void actionPerformed(ActionEvent e1){ try { String str = T2.getText(); byte[] buf = str.getBytes(); DatagramSocket D = new DatagramSocket(); InetAddress A = InetAddress.getLocalHost(); DatagramPacket P1 = new DatagramPacket (buf,buf.length,A,8002); D.send(P1); T2.setText(""); } catch(Exception e2){ } } public void run() { try { DatagramSocket D = new DatagramSocket(8001); while(true) { D.receive(Pac); String str = new String(Pac.getData(),0,Pac.getLength()); T1.append(Pac.getAddress()+" WC7说 "+str+"\n"); } } catch(Exception e3){ } } public static void main(String args[]){ new WC7(); } }
import java.io.*;import java.net.*;import java.awt.*;import java.awt.event.*;public class WS7 extends Frame implements ActionListener,Runnable{ DatagramSocket D; byte dataBuf[] = new byte[512]; InetAddress A; DatagramPacket Pac = new DatagramPacket(dataBuf,dataBuf.length); TextArea T1 = new TextArea(); TextField T2 = new TextField(23); public WS7() { add(T1,"Center"); Panel P = new Panel(); P.add(new Label ("发送的信息")); P.add(T2); T2.addActionListener(this); add(P,"South"); setSize(350,200); setVisible(true); setTitle("WS7"); addWindowListener (new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); (new Thread (this)).start(); } public void actionPerformed(ActionEvent e1){ try { String str = T2.getText(); byte[] buf = str.getBytes(); DatagramSocket D = new DatagramSocket(); InetAddress A = InetAddress.getLocalHost(); DatagramPacket P1 = new DatagramPacket (buf,buf.length,A,8001); D.send(P1); T2.setText(""); } catch(Exception e2){ } } public void run() { try { DatagramSocket D = new DatagramSocket(8002); while(true) { D.receive(Pac); String str = new String(Pac.getData(),0,Pac.getLength()); T1.append(Pac.getAddress()+" WS7说 "+str+"\n"); } } catch(Exception e3){ } } public static void main(String args[]){ new WS7(); } }
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