解决tomcat服务器跨域请求问题

--- 前沿-- 工作中项目进行前后端分离时，前段调用后端接口时会出现跨域问题

在tomcat 的web.xml 配置文件中加入如下配置过滤器

（如web.xml中有多个filter时要把下面配置放在最前端）

<filter> <filter-name>CorsFilter</filter-name> <filter-class>org.apache.catalina.filters.CorsFilter</filter-class> <init-param> <param-name>cors.allowed.methods</param-name> <param-value>GET,POST,HEAD,OPTIONS,PUT</param-value> </init-param> <init-param> <param-name>cors.allowed.headers</param-name> <param-value>Access-Control-Allow-Origin,Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value> </init-param> <async-supported>true</async-supported> </filter> <filter-mapping> <filter-name>CorsFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

如果async-supported标签报错;;;要在<web-app version="3.0" xmlns=" ..在此加入.. "加入如下两个配置

http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd

如上：前段可以正常访问后端接口，亲测可用.