jave中的udp套接字，接收方未收到消息

when i use this code , the sender successfully send the message byt the receiver can''t receive this messagepackage UDP_Socket;import java.net.*;import java.io.*;public class PacketReceiver { public static void main(String[] args) { try {// Create a datagram socket, bound to the specific port 9999 DatagramSocket socket = new DatagramSocket(9999);// Create a datagram packet, containing a maximum buffer of 256 bytes DatagramPacket packet = new DatagramPacket(new byte[256], 256);// Receive a packet - remember by default this is a blocking operation //socket.setSoTimeout(10000); socket.receive(packet); System.out.println("Packet received!");// Display packet information InetAddress remote_addr = packet.getAddress(); System.out.println("Sent by host: " + remote_addr.getHostAddress()); System.out.println("Sent from port: " + packet.getPort());// Display packet contents, by reading from byte array ByteArrayInputStream bin = new ByteArrayInputStream(packet.getData());// Display only up to the length of the original UDP packet for (int i = 0; i < packet.getLength(); i++) { int data = bin.read(); if (data == -1) break; else System.out.print((char)data); } socket.close(); } catch (IOException ioe) { System.err.println("Error - " + ioe); } }}package UDP_Socket;import java.net.*;import java.io.*;public class PacketSender { public static void main(String[] args) { try {// Hostname/IP address of the remote server String hostname = "localhost";// Lookup the specified hostname, and get an InetAddress System.out.println("Looking up hostname " + hostname); InetAddress remote_addr = InetAddress.getByName(hostname); System.out.println("Hostname resolved as " + remote_addr.getHostAddress());// Create a datagram socket, bound to any available local port DatagramSocket socket = new DatagramSocket();// Create a message to send using a UDP packet ByteArrayOutputStream bout = new ByteArrayOutputStream(); PrintStream pout = new PrintStream(bout); pout.print("Greetings!");// Get the contents of our message as an array of bytes byte[] barray = bout.toByteArray();// Create a datagram packet, containing our byte array DatagramPacket packet = new DatagramPacket(barray, barray.length);// Set the destination address of the packet packet.setAddress(remote_addr);// Set port number to 9999 packet.setPort(9999);// Send the packet - remember no guarantee of delivery socket.send(packet); System.out.println("Packet sent!"); socket.close(); } catch (UnknownHostException uhe) { System.err.println("Can't find host " + uhe.getMessage()); } catch (IOException ioe) { System.err.println("Error - " + ioe); } }} 解决方案 这篇关于jave中的udp套接字，接收方未收到消息的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 1403页，肝出来的..