现象：
原因：
java在选择协议时，会优先选择IPV6协议；若IPV6协议不可使用，那么访问不能通过；（在java程序中访问外网地址时，若在程序中不能访问，而在浏览器中可以访问，那么有可能是协议问题）；
解决方案：
在java虚拟机运行环境设置中添加如下参数配置：-Djava.net.preferIPv4Stack=true
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