码头过滤器：
<web-app> <filter> <filter-name>cross-origin</filter-name> <filter-class>org.eclipse.jetty.servlets.CrossOriginFilter</filter-class> <init-param> <param-name>allowedOrigins</param-name> <param-value>*</param-value> </init-param> <init-param> <param-name>allowedMethods</param-name> <param-value>*</param-value> </init-param> <init-param> <param-name>allowedHeaders</param-name> <param-value>*</param-value> </init-param> </filter> <filter-mapping> <filter-name>cross-origin</filter-name> <filter-pattern>*</filter-pattern> </filter-mapping></web-app>
