详解SpringBoot2 使用Spring Session集群

有几种办法：

1.扩展指定server

利用servlet容器提供的插件功能，自定义httpsession的创建和管理策略，并通过配置的方式替换掉默认的策略。缺点：耦合tomcat/jetty等servlet容器，不能随意更换容器。

2.利用filter

利用httpservletrequestwrapper，实现自己的 getsession()方法，接管创建和管理session数据的工作。spring-session就是通过这样的思路实现的。

3 利用spring session

spring boot中spring session支持方式：

jdbc、mongodb、redis、hazelcast、hashmap

一、引入maven依赖

				?

									<properties>

									  <project.build.sourceencoding>utf-8</project.build.sourceencoding>

									  <project.reporting.outputencoding>utf-8</project.reporting.outputencoding>

									  <java.version>1.8</java.version>

									 </properties>

									 <dependencies>

									  <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>

									  <dependency>

									   <groupid>org.springframework.boot</groupid>

									   <artifactid>spring-boot-starter-web</artifactid>

									  </dependency>

									 </dependencies>

二、配置application.properties

				?

									server.port=8080

									spring.redis.host=localhost

									spring.redis.port=6379

									# spring session使用存储类型

									spring.session.store-type=redis

•spirngboot默认就是使用redis方式，如果不想用可以填none。、

三、在启动类中加入@enableredishttpsession 注解

				?

									package com.shyroke;

									import org.springframework.boot.springapplication;

									import org.springframework.boot.autoconfigure.springbootapplication;

									import org.springframework.cache.annotation.enablecaching;

									import org.springframework.session.data.redis.config.annotation.web.http.enableredishttpsession;

									@enablecaching

									@enableredishttpsession

									@springbootapplication

									public class springbootsessionapplication {

									 public static void main(string[] args) {

									  springapplication.run(springbootsessionapplication.class, args);

									 }

									}

四、编写控制器

				?

									package com.shyroke.controller;

									import java.util.hashmap;

									import java.util.map;

									import javax.servlet.http.httpservletrequest;

									import javax.servlet.http.httpservletresponse;

									import org.springframework.http.httprequest;

									import org.springframework.stereotype.controller;

									import org.springframework.web.bind.annotation.requestmapping;

									import org.springframework.web.bind.annotation.responsebody;

									@controller

									@requestmapping(value = "/")

									public class indexcontroller {

									 @responsebody

									 @requestmapping(value = "/session")

									 public map<string, object> getsession(httpservletrequest request) {

									  request.getsession().setattribute("username", "admin");

									  map<string, object> map = new hashmap<string, object>();

									  map.put("sessionid", request.getsession().getid());

									  return map;

									 }

									 @responsebody

									 @requestmapping(value = "/get")

									 public string get(httpservletrequest request) {

									  string username = (string) request.getsession().getattribute("username");

									  return username;

									 }

									}