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简言之，CORS就是为了让AJAX可以实现可控的跨域访问而生的。
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。（可在
http://search.maven.org上查询并下载。）工程项目（如：geoserver）中web.xml中的配置如下：
<filter> <filter-name>CORS</filter-name> <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class> <init-param> <param-name>cors.allowOrigin</param-name> <param-value>*</param-value> </init-param> <init-param> <param-name>cors.supportedMethods</param-name> <param-value>GET, POST, HEAD, PUT, DELETE</param-value> </init-param> <init-param> <param-name>cors.supportedHeaders</param-name> <param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value> </init-param> <init-param> <param-name>cors.exposedHeaders</param-name> <param-value>Set-Cookie</param-value> </init-param> <init-param> <param-name>cors.supportsCredentials</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CORS</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
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原文地址：http://www.cnblogs.com/tianyalu/p/4514014.html
