<!--cors filter-->

  <filter>

    <filter-name>CorsFilter</filter-name>

    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>

  </filter>

  <filter-mapping>

    <filter-name>CorsFilter</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>

在tomcat 官方文档中，有详细配置http://tomcat.apache.org/tomcat-7.0-doc/config/filter.html

<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>

根据自己需要加入相应配置，另外注意过滤器顺序问题，最好在web.xml中配置过滤器时，把过滤器放在最后一个