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本篇内容介绍了“springcloud怎么实现Session共享”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
通常情况下,Tomcat、Jetty等Servlet容器,会默认将Session保存在内存中。如果是单个服务器实例的应用,将Session保存在服务器内存中是一个非常好的方案。但是这种方案有一个缺点,就是不利于扩展。目前越来越多的应用采用分布式部署,用于实现高可用性和负载均衡等。那么问题来了,如果将同一个应用部署在多个服务器上通过负载均衡对外提供访问,如何实现Session共享?实现Session共享的方案很多,其中一种常用的就是使用Tomcat、Jetty等服务器提供的Session共享功能,将Session的内容统一存储在一个数据库(如MySQL)或缓存(如Redis)中。
下面我们将在springcloud微服务项目中,使用redis实现简单高效的session共享。
新建一个spring boot项目,命名springcloud-session-redis
POM依赖配置
<?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"> <modelVersion>4.0.0</modelVersion> <groupId>com.carry</groupId> <artifactId>springcloud-session-redis</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springcloud-session-redis</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.4.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-cloud.version>Finchley.SR1</spring-cloud.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.apache.commons</groupId> <artifactId>commons-pool2</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
配置文件
在application.yml中加入redis、eureka、port等配置,需要JAVA Spring Cloud大型企业分布式微服务
云构建的B2B2C电子商务平台源码:三五三六二四七二五九.
server: port: 8090 spring: application: name: service-session-redis redis: host: 192.168.68.100 port: 6379 password: 123456 timeout: 6000ms lettuce: pool: max-active: 8 max-wait: -1ms max-idle: 8 min-idle: 0 database: 0 eureka: client: serviceUrl: defaultZone: http://admin:123456@localhost:8761/eureka/ management: endpoints: web: exposure: include: "*" cors: allowed-origins: "*" allowed-methods: "*"
Redis Session配置类
package com.carry.config; import org.springframework.context.annotation.Configuration; import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession; @Configuration @EnableRedisHttpSession public class RedisSessionConfig { }
控制层Controller中添加测试方法
package com.carry.controller; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.springframework.cloud.context.config.annotation.RefreshScope; import org.springframework.util.StringUtils; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RefreshScope public class UserManagementController { /** * redis sesion共享 * * @param request * @return */ @GetMapping("/getUser") public String getUser(HttpServletRequest request) { HttpSession session = request.getSession(); String username = (String) session.getAttribute("username"); if (StringUtils.isEmpty(username)) { username = "testSessionRedis|" + System.currentTimeMillis(); session.setAttribute("username", username); } System.out.println("访问端口:" + request.getServerPort()); return username; } }
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