添加依赖jar，版本由使用jetty版本决定
<dependency><groupId>org.eclipse.jetty</groupId><artifactId>jetty-servlets</artifactId><version>9.3.0.M2</version>
</dependency>在web.xml中配置
<!-- 让jetty支持跨域访问 --><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>GET,POST,HEAD</param-value></init-param><init-param><param-name>allowedHeaders</param-name><param-value>X-Requested-With,Content-Type,Accept,Origin</param-value></init-param></filter><!-- 此处表示jetty中的所有url都可以支持跨域 --><filter-mapping><filter-name>cross-origin</filter-name><url-pattern>/*</url-pattern></filter-mapping>