关于请求跨域及response中Set-Cookie无效问题记录

最近开发一个项目，项目前后端完全分离，即

页面放在192.168.0.105:8080中，

服务端放在192.168.0.105:57500中，

这样前台发送请求后会出现跨域问题，针对跨域问题，解决思路为处理响应头，步骤如下

1.定义一个过滤器，在web.xml中配置

 

    ajaxFilter
    com.tbms.filter.AjaxFilter
  
  
    ajaxFilter
    /*
  

2.在过滤其中处理响应头

1. public class AjaxFilter extends OncePerRequestFilter{

2.  

3. @Override

4. protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)

5. throws ServletException, IOException {

6. System.out.println("拦截到了" + request.getRequestURL());

7. response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));

8. response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, If-Modified-Since");

9. response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");

10. response.setHeader("Access-Control-Max-Age", "3600");

11. response.addHeader("Access-Control-Allow-Credentials", "true");

12. response.setCharacterEncoding("UTF-8");

13. response.setContentType("application/json");

14. //此行代码确保请求可以继续执行至Controller

15. filterChain.doFilter(request, response);

16. }

17. }

3.前台发送请求

1. $.ajax({

2. type: "post",

3. url: that.ip + that.port + that.prjName + "/login",

4. data: JSON.stringify(loginInfo),

5. contentType: "application/json",

6. dataType: "json",

7. xhrFields: {withCredentials: true},

8. success: function(rs) {

9. if(rs.state == 'success'){

10. that.SelectCompany = false;

11. that.$router.push("/index/res/signet")

12. }

13. },

14. error: function(){

15. alert("用户名密码错误！");

16. },

17. });

PS：1.第二步中红色代码"Access-Control-Allow-Origin"对应的值不能为通配符“*”。
2.response.addHeader("Access-Control-Allow-Credentials", "true"); 该行代码表示允许跨域发送Cookie

3.在ajax请求中应加入xhrFields: {withCredentials: true},否则，依然不会发送Cookie