session跨域丢失问题

配置一个 filter

 1 package com.psm.filter;
 2
 3 import javax.servlet.*;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 import java.io.IOException;
 7
 8 /**
 9  * 添加Ajax Access-Control-Allow-Origin跨域请求
10  *
11  * @author
12  * @create 2018-02-26 17:00
13  **/
14 public class VisitFilter implements Filter {
15
16     @Override
17     public void init(FilterConfig filterConfig) throws ServletException {
18
19     }
20
21     @Override
22     public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
23         HttpServletResponse res = (HttpServletResponse) servletResponse;
24         HttpServletRequest request=(HttpServletRequest)servletRequest;
25         res.setContentType("textml;charset=UTF-8");
26         res.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
27         res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
28         res.setHeader("Access-Control-Max-Age", "0");
29         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");
30         res.setHeader("Access-Control-Allow-Credentials", "true");
31         res.setHeader("XDomainRequestAllowed","1");
32         filterChain.doFilter(servletRequest,servletResponse);
33     }
34
35     @Override
36     public void destroy() {
37
38     }
39 }

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"));

原文地址：https://www.cnblogs.com/oldzhang1222/p/8491957.html