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);
}
}
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
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