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"));