SpringCloud 共享 Session 同步

通常情況下，Tomcat、Jetty等Servlet容器，會默認將Session保存在內存中。如果是單個服務器實例的應用，將Session保存在服務器內存中是一個非常好的方案。但是這種方案有一個缺點，就是不利於擴展。

目前越來越多的應用採用分佈式部署，用於實現高可用性和負載均衡等。那麼問題來了，如果將同一個應用部署在多個服務器上通過負載均衡對外提供訪問，如何實現Session共享？

實際上實現Session共享的方案很多，其中一種常用的就是使用Tomcat、Jetty等服務器提供的Session共享功能，將Session的內容統一存儲在一個數據庫（如MySQL）或緩存（如Redis）中。

下面我們將在springcloud微服務項目中，使用redis實現簡單高效的session共享。官網：www.fhadmin.org

• eureka-server：註冊中心

• springcloud-session-redis：業務session所在項目

• springcloud-session-zuul：路由網關

springcloud-session-redis項目

新建一個spring boot項目，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配置類

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 {}

控制層Controller中添加測試方法

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("訪問端口：" + request.getServerPort());
        return username;
    }}

springcloud-session-zuul項目

新建springboot項目，命名springcloud-session-zuul

POM依賴配置

<?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-zuul
zuul: 
  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負載均衡參數配置
  ReadTimeout: 5000
  ConnectTimeout: 5000
eureka:
  client:
    serviceUrl:
      defaultZone: http://admin:123456@localhost:8761/eureka/

啓動類

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);
    }}