Session持久化

1. 添加依赖

在项目中添加session依赖和redis依赖，如下所示：

  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-data-redis</artifactId>
        </dependency>

2. 配置redis连接信息

# redis连接配置信息
spring.redis.host=124.221.76.124
# 不写默认wei6379，数据库为0
# spring.redis.database=15
spring.redis.port=6379

# 配置session连接信息
spring.session.store-type=redis
server.servlet.session.timeout=1800
spring.session.redis.flush-mode=on_save
spring.session.redis.namespace=spring:session

3. 存储和读取session从Redis


package com.example.sp_redis.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * 实现session持久化
 * @author zq
 * @date 2023-07-26 14:37
 */

@RestController
public class UserController {
    private static final String SESS_USER_KEY = "SESS_USER_KEY";
    @RequestMapping("/login")
    public String login(HttpSession httpSession) {
        //存入session
        httpSession.setAttribute(SESS_USER_KEY, "wangwu");
        return "Session set success.";
    }
    @RequestMapping("/getuser")
    public String getUser(HttpServletRequest request) {
        String user = "NULL";
        HttpSession session = request.getSession(false);
        if (session != null) {
            //从redis中获取session
            Object userObj = session.getAttribute(SESS_USER_KEY);
            if (userObj != null) {
                user = userObj.toString();
            }
        }
        return user;
    }
}