spring boot获取session的值为null问题及解决方法
作者：乔路非
我在登陆的时候，登陆成功后将name存进了session，然后在获取个人信息时取出session里的name的值为null，接下来通过本文给大家分享springboot获取session的值为null问题,需要的朋友可以参考下
问题描述：
我在登陆的时候，登陆成功后将name存进了session，然后在获取个人信息时取出session里的name的值为null.
在login里存session：
在getUserInfo里获取session的name:
控制台结果：
直接原因：
两个session对象不同，即session.getId()的值不同
根本原因：
涉及前端传参没有携带cookie,后端不能证明是同一会话，故建的session不是同一个对象
解决方案：
本人前端是vue项目，故在main.js里添加：
axios.defaults.withCredentials = true
后端spring boot项目中添加：
CorsFilter.class
package com.postcode.item;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
@WebFilter(urlPatterns = "/*", filterName = "CorsFilter")
public class CorsFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
HttpServletRequest reqs = (HttpServletRequest) req;
String curOrigin = reqs.getHeader("Origin");
response.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, DELETE, PUT");
response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
chain.doFilter(req, res);
}
@Override
public void init(FilterConfig filterConfig) {
}
@Override
public void destroy() {}
}CorsFilter.class
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
@WebFilter(urlPatterns = "/*", filterName = "CorsFilter")
public class CorsFilter implements Filter {
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
HttpServletRequest reqs = (HttpServletRequest) req;
String curOrigin = reqs.getHeader("Origin");
response.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
response.setHeader("Access-Control-Allow-Credentials", "true");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, DELETE, PUT");
response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
chain.doFilter(req, res);
}
@Override
public void init(FilterConfig filterConfig) {
}
@Override
public void destroy() {}
}最后结果：
在之前的基础上多打印了session.getId()，可以看到两个session的id相同，并且session里的name值也取到了
参考资料：
cookie相关
Access-Control-Allow-Origin与跨域
Spring Boot如何解决前端的Access-Control-Allow-Origin跨域问题
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