SpringBoot2 使用Spring Session集群详解SpringBoot2 使用Spring Session集群

hongxinerke 2021-03-30 我要评论

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;
 }
}

五、测试

•先输入http://localhost:8080/session，在session中设置一个值