使用Java进行udp-demo编程时碰到的consumer和producter无法连接并报出“java.net.SocketException: Can't assign requested address”问题

在用Java编写了一个udp生产者和消费者的demo时，在生产者启动的时候会抛出异常

java.net.SocketException: Can't assign requested address
    at java.net.PlainDatagramSocketImpl.join(Native Method)
    at java.net.AbstractPlainDatagramSocketImpl.join(AbstractPlainDatagramSocketImpl.java:178)
    at java.net.MulticastSocket.joinGroup(MulticastSocket.java:323)
    at com.yanwu.demo.java.socket.udp.Producer.<init>(Producer.java:41)
    at com.yanwu.demo.java.socket.udp.Producer.main(Producer.java:71)

解决方案：

在jvm的启动参数中添加-Djava.net.preferIPv4Stack=true.