SpringCloud 分布式 Session 共享同步
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？
实际上实现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。官网：www.fhadmin.org
eureka-server：注册中心
springcloud-session-redis：业务session所在项目
springcloud-session-zuul：路由网关
springcloud-session-redis项目新建一个spring boot项目，命名springcloud-session-redis
pom
<?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
server: port: 8090spring: 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: 0eureka: 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@EnableRedisHttpSessionpublic 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@RefreshScopepublic 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; }}springcloud-session-zuul项目
新建springboot项目，命名springcloud-session-zuul
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-zuul</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springcloud-session-zuul</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.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-zuul</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
server: port: 1100spring: application: name: service-session-zuulzuul: ignoredServices: '*' #忽略所有未配置的service host: connect-timeout-millis: 20000 socket-timeout-millis: 20000 routes: redis-session-service: path: /user-session/** serviceId: service-session-redis sensitiveHeaders: "*" ribbon: #ribbon负载均衡参数配置 ReadTimeout: 5000 ConnectTimeout: 5000eureka: client: serviceUrl: defaultZone: http://admin:123456@localhost:8761/eureka/启动类
package com.carry;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.zuul.EnableZuulProxy;@EnableEurekaClient@SpringBootApplication@EnableZuulProxypublic class SpringcloudSessionZuulApplication { public static void main(String[] args) { SpringApplication.run(SpringcloudSessionZuulApplication.class, args); }}
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