springboot redis 缓存跨域丢失问题

时间：2023-03-09 13:33:00
springboot redis 缓存跨域丢失问题

对于前后端分离的项目，在开发阶段经常会遇到跨域的问题。

1.首先，对于后台的处理方式，第一种是用 @CrossOrigin 注解，@crossorigin是后端SpringMVC框架（需4.2版本以上）Controller层的一个注解，这个注解是用在控制器方法上的，但这种方式不能做到统一跨域处理

@CrossOrigin(origins = "http://localhost:3000")

@RequestMapping(method = RequestMethod.GET)

List<User> getList() {

    return Lists.newArrayList(userdb.asMap().values());

}

2. 第二种方式是 构建一个拦截器

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.stereotype.Component;

public class SimpleCORSFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

        HttpServletResponse response = (HttpServletResponse) res;

        HttpServletRequest request=  (HttpServletRequest)req;

        response.setHeader("Access-Control-Allow-Credentials","true");//允许跨域加载

        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", "");

        response.setHeader("Access-Control-Allow-Headers", "x-requested-with");//ajax请求

        chain.doFilter(req, res);

    }

    public void init(FilterConfig filterConfig) {

    }

    public void destroy() {}

}

3.当然，前端ajax请求时，也可以做相应的处理，关键代码 crossDomain: true, xhrFields: { withCredentials: true }

$.ajax({

             type: "POST",

             url: window.ServiceUrl+"/custom/clientLogin",

             crossDomain: true,

             xhrFields: { withCredentials: true },

             data: {username:loginName,password:password},

             dataType : "json",

             success: function(respMsg){

                       //正常操作

             },

             error:function(){

                 //异常操作

             }

         });

4.如果上述方法都不行，可以检查一下cookie的domain和path属性：这里引用一下大佬的章

https://blog.****.net/zhouziyu2011/article/details/61200943

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