cors解决跨域问题

来源：互联网发布：关口知宏妻子编辑：程序博客网时间：2024/05/13 12:48

cors跨域：

什么是跨域:

简单地说就是请求几个不同域名之间的资源,出于对安全的考虑,浏览器默认拒绝跨域访问,导致获取资源失败.

实现：
第一步：tomcat7支持

Tomcat下的配置

下载cors-filter-1.7.jar，java-property-utils-1.9.jar这两个库文件，放到lib目录下。

第二步：在web.xml文件中添加filter，这个filter最好所有filter的第一位

    <filter>
        <filter-name>CorsFilter</filter-name>
       <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
       <init-param>
           <param-name>cors.allowed.origins</param-name>
           <param-value>*</param-value>
       </init-param>
       <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>Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
       </init-param>
       <init-param>
           <param-name>cors.exposed.headers</param-name>
           <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
       </init-param>
       <init-param>
           <param-name>cors.support.credentials</param-name>
           <param-value>true</param-value>
       </init-param>
       <init-param>
           <param-name>cors.preflight.maxage</param-name>
           <param-value>10</param-value>
       </init-param>
   </filter>
   <filter-mapping>
       <filter-name>CorsFilter</filter-name>
       <url-pattern>/*</url-pattern>
   </filter-mapping>

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