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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