String str2 = new RecSocket(21000).recString; String str3 = new RecSocket(31000).recString; public class RecSocket extends DatagramSocket{ String recString; public RecSocket(int in)throws Exception{ DatagramSocket dSocket = new DatagramSocket(in); byte[] buf = new byte[1024]; DatagramPacket p = new DatagramPacket(buf,buf.length); dSocket.receive(p); buf = p.getData(); dSocket.close() }

String str2 = new RecSocket(21000).recString;

String str3 = new RecSocket(31000).recString;

主机1监听21000端口（主机2的返回值），31000(主机3返回的值)

java Socket编程中，为什么监听多个端口时出现有一个端口无法接受到信息，需要用到线程吗

String str2 = new RecSocket(21000).recString; String str3 = new RecSocket(31000).recString; public class RecSocket extends DatagramSocket{ String recString; public RecSocket(int in)throws Exception{ DatagramSocket dSocket = new DatagramSocket(in); byte[] buf = new byte[1024]; DatagramPacket p = new DatagramPacket(buf,buf.length); dSocket.receive(p); buf = p.getData(); dSocket.close() }

String str2 = new RecSocket(21000).recString;

String str3 = new RecSocket(31000).recString;

主机1监听21000端口（主机2的返回值），31000(主机3返回的值)

java Socket编程中，为什么监听多个端口时出现有一个端口无法接受到信息，需要用到线程吗