前后台端分离 跨域SESSION 失效问题

后端代码接口：

                package com.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.config.annotation.CorsRegistry;

/**
 * 解决Rest接口调用过程中，跨域访问问题
 * @author lixin
 * @version 1.0
 */
public class CORSFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        response.setContentType("textml;charset=UTF-8");
        response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "0");
        response.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("XDomainRequestAllowed","1");
        chain.doFilter(req, res);
    }
    public void init(FilterConfig filterConfig) {}
    public void destroy() {}

}

web.xml 中的配置：

         <filter>
<filter-name>CorsFilter</filter-name>
<filter-class>com.filter.CORSFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>CorsFilter</filter-name>
<url-pattern>/*</url-pattern>

</filter-mapping>

前台ajax 请求配置：红色重要

        $.ajax({  
                 type:"post",  
                 url:"·····················································",  
                 dataType: 'json',
                 xhrFields: {
   withCredentials: true
},
crossDomain: true,
                 success:function(data){  
                  $("#dianhua").html(data);
                 }     

             });