java程序_获取端口

import java.net.ServerSocket;

public class TestNetUtil {
public static void main(String [] args) {

try {
ServerSocket socket = new ServerSocket(0);
int port = socket.getLocalPort();
socket.close();

} catch (Exception e) {
System.out.println(e.getMessage());
}
}
}

执行javac TestNetUtil.java，会生成TestNetUtil.class
然后执行java TestNetUtil

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