java跨域问题

 public class SimpleCORSFilter implements Filter{  

     @Override
     public void destroy() {  

     }  

     @Override
     public void doFilter(ServletRequest req, ServletResponse res,
             FilterChain chain) throws IOException, ServletException {
             HttpServletResponse response = (HttpServletResponse) res;
             response.setHeader("Access-Control-Allow-Origin", "*");
             response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
             response.setHeader("Access-Control-Max-Age", "3600");
             response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
             chain.doFilter(req, res);  

     }  

     @Override
     public void init(FilterConfig arg0) throws ServletException {  

     }  

 }

web.xml配置

 <filter>
       <filter-name>cors</filter-name>
       <filter-class>com.ssm.web.filter.SimpleCORSFilter</filter-class>
     </filter>
     <filter-mapping>
       <filter-name>cors</filter-name>
       <url-pattern>/*</url-pattern>
     </filter-mapping>