1.什么事Spring Session？

HTTP协议本身是无状态的，为了保存会话信息，浏览器Cookie通过SessionID标识会话请求，服务器以SessionID为key来存储会话信息。在单实例应用中，可以考虑应用进程自身存储，随着应用体量的增长，需要横向扩容，多实例session共享问题随之而来。

Spring Session就是为了解决多进程session共享的问题
Spring Session支持存储在Hazelcast 、Redis、MongoDB、关系型数据库，本文主要讨论session存储在Redis。

2.redis换搭建

docker run -itd --name redis-6379 -p 6379:6379 redis --requirepass 123456

3.代码工程

实验目的：通过redis实现session共享

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>springboot-demo</artifactId>        <groupId>com.et</groupId>        <version>1.0-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>
    <artifactId>session</artifactId>
    <properties>        <maven.compiler.source>8</maven.compiler.source>        <maven.compiler.target>8</maven.compiler.target>    </properties>    <dependencies>
        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>
        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-autoconfigure</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <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>
    </dependencies></project>

application.properties

## Session store-typespring.session.store-type=redis
## Session timeout defaultserver.servlet.session.timeout=600## Session store to Redis key prefixspring.session.redis.namespace=test:spring:session
## Redis configspring.redis.host=127.0.0.1spring.redis.password=123456spring.redis.port=6379server.port=8088

controller

package com.et.session.java.demo.et.demo.controller;
import java.util.HashMap;import java.util.Map;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;
@RestControllerpublic class HelloWorldController {    @RequestMapping("/hello")    public Map<String, Object> showHelloWorld(){        Map<String, Object> map = new HashMap<>();        map.put("msg", "HelloWorld");        return map;    }    @RequestMapping("/get/{name}")    public String getSesseion(HttpServletRequest request, @PathVariable("name") String name){        HttpSession session = request.getSession();        String value = (String)session.getAttribute(name);        return "sessionId:"+session.getId()+" value:"+value;    }    @RequestMapping("/add/{name}/{value}")    public String addSession(HttpServletRequest request,@PathVariable("name") String name,@PathVariable("value") String value){        HttpSession session = request.getSession();        session.setAttribute(name,value);        return "sessionId:"+session.getId()+" name:"+name;    }
}

DemoApplication.java

package com.et.session.java.demo.et.demo;
import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplicationpublic class DemoApplication {
   public static void main(String[] args) {      SpringApplication.run(DemoApplication.class, args);   }}

以上只是一些关键代码，所有代码请参见下面代码仓库

代码仓库

https://github.com/Harries/springboot-demo

4.测试

启动Spring Boot应用

创建Session

http://127.0.0.1:8088/add/aaa/111

获取Session

http://127.0.0.1:8088/get/aaa

5.参考

https://www.baeldung.com/spring-session
https://www.springcloud.cc/spring-session.html#modules
http://www.liuhaihua.cn/archives/710469.html

ITPub博客

Spring Boot集成Spring Session快速入门Demo