原创

Spring Boot集成Spring Session快速入门Demo

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-type
spring.session.store-type=redis

## Session timeout default
server.servlet.session.timeout=600
## Session store to Redis key prefix
spring.session.redis.namespace=test:spring:session

## Redis config
spring.redis.host=127.0.0.1
spring.redis.password=123456
spring.redis.port=6379
server.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;

@RestController
public 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;

@SpringBootApplication
public class DemoApplication {

   public static void main(String[] args) {
      SpringApplication.run(DemoApplication.class, args);
   }
}