session跨域丢失问题

配置一个 filter

 package com.psm.filter;

 import javax.servlet.*;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;

 /**
  * 添加Ajax Access-Control-Allow-Origin跨域请求
  *
  * @author
  * @create 2018-02-26 17:00
  **/
 public class VisitFilter implements Filter {

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

     }

     @Override
     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
         HttpServletResponse res = (HttpServletResponse) servletResponse;
         HttpServletRequest request=(HttpServletRequest)servletRequest;
         res.setContentType("textml;charset=UTF-8");
         res.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
         res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
         res.setHeader("Access-Control-Max-Age", "0");
         res.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");
         res.setHeader("Access-Control-Allow-Credentials", "true");
         res.setHeader("XDomainRequestAllowed","1");
         filterChain.doFilter(servletRequest,servletResponse);
     }

     @Override
     public void destroy() {

     }
 }

添加下面这两个

response.setHeader("Access-Control-Allow-Credentials","true"); //是否支持cookie跨域
response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));