UDP套接字的java编程
此示例代码如下所示:UDP套接字的java编程,java,sockets,udp,Java,Sockets,Udp,此示例代码如下所示: public class UDPServer { enter code here /** * @param args */ public static void main(String[] args) throws Exception{ // TODO Auto-generated method stub DatagramSocket serverSocket=new DatagramSocket
public class UDPServer
{
enter code here
/**
* @param args
*/
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
DatagramSocket serverSocket=new DatagramSocket(9876);
byte[] receiveData=new byte[1024];
byte[] sendData=new byte[1024];
while(true)
{
DatagramPacket receivePacket=new DatagramPacket(receiveData, receiveData.length);
String sentence=new String(receivePacket.getData());
InetAddress IPAddress=receivePacket.getAddress();
int port=receivePacket.getPort();
String capitalizedSentennce=sentence.toUpperCase();
sendData=capitalizedSentennce.getBytes();
DatagramPacket sendPacket=new DatagramPacket(sendData, sendData.length,IPAddress,port);
serverSocket.send(sendPacket);
}
}
}
执行时出现以下错误:
Exception in thread "main" java.lang.IllegalArgumentException: Port out of range:-1
at java.net.DatagramPacket.setPort(Unknown Source)
at java.net.DatagramPacket.<init>(Unknown Source)
at java.net.DatagramPacket.<init>(Unknown Source)
at UDPServer.main(UDPServer.java:21)
线程“main”java.lang.IllegalArgumentException中的异常:端口超出范围:-1
位于java.net.DatagramPacket.setPort(未知源)
位于java.net.DatagramPacket。(未知源)
位于java.net.DatagramPacket。(未知源)
位于UDPServer.main(UDPServer.java:21)
有人能帮我解决吗?如果可能,请提供发生这种情况的其他信息。您忘记在
接收数据包中接收任何内容。
因此没有任何内容。没有端口号,没有源地址,没有数据