Springmvc resolving cross-domain requests

1, creating a class

Package com.hzc.util;

Import java.io.IOException;
Import Javax.servlet.FilterChain;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServletRequest;

Import Javax.servlet.http.HttpServletResponse;

Import Org.springframework.web.filter.OncePerRequestFilter; public class Crossfilter extends Onceperrequestfilter {@Override protected void dofilterinternal (Httpservletreque St Request, httpservletresponse Response, Filterchain Filterchain) throws Servletexception, Ioexce ption {//if (Request.getheader ("Access-control-request-method")! = NULL &&//"OPTIONS". Equals (R Equest.getmethod ())) {//CORS "pre-flight" Request Response.AddHeader ("Access-control-allow-origin", "*")
        ;
        Response.AddHeader ("Access-control-allow-methods", "GET, POST, PUT, DELETE");
        Response.AddHeader ("Access-control-allow-headers", "Content-type"); Response.AddHeader ("Access-control-max-age", "1800");//min//} filterchain.dofilter (request, response);
 }

}

2. Configure Web. xml

<filter>
    <filter-name>cors</filter-name>
    <filter-class> com.hzc.util.crossfilter</filter-class>
</filter>
<filter-mapping>
    < filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping >

At this point, the option requests access by the Crossfilter filter and gives the cross-domain response header, as well as the Dooption method in the Frameworkservlet. View the browser console, discover that the option request returns support for cross-domain information, and subsequent post requests enter the controller.