报错信息如下：
‘Access-Control-Allow-Origin‘ header is present on the requested resource. Origin ‘null‘ is therefore not allowed access.
所需jar包：cors-filter-2.8.jar和java-property-utils-1.9.1.jar
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java 跨域请求解决方案（'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.）
原文：https://www.cnblogs.com/Marydon20170307/p/11579950.html
