Spring Cloud分布式Session共享實踐

本文轉載自查看原文 2018-08-28 14:26 19900 Spring Cloud

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采用分布式部署，用於實現高可用性和負載均衡等。那么問題來了，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。

項目介紹

eureka-server：注冊中心
springcloud-session-redis：業務session所在項目
springcloud-session-zuul：路由網關

eureka-server延用之前Eureka服務注冊與發現一文中的注冊中心，不再贅述

springcloud-session-redis項目

新建一個spring boot項目，命名springcloud-session-redis

POM依賴配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>com.carry</groupId>
 8     <artifactId>springcloud-session-redis</artifactId>
 9     <version>0.0.1-SNAPSHOT</version>
10     <packaging>jar</packaging>
11 
12     <name>springcloud-session-redis</name>
13     <description>Demo project for Spring Boot</description>
14 
15     <parent>
16         <groupId>org.springframework.boot</groupId>
17         <artifactId>spring-boot-starter-parent</artifactId>
18         <version>2.0.4.RELEASE</version>
19         <relativePath /> <!-- lookup parent from repository -->
20     </parent>
21 
22     <properties>
23         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
24         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
25         <java.version>1.8</java.version>
26         <spring-cloud.version>Finchley.SR1</spring-cloud.version>
27     </properties>
28 
29     <dependencies>
30         <dependency>
31             <groupId>org.springframework.boot</groupId>
32             <artifactId>spring-boot-starter-data-redis</artifactId>
33         </dependency>
34         <dependency>
35             <groupId>org.springframework.session</groupId>
36             <artifactId>spring-session-data-redis</artifactId>
37         </dependency>
38         <dependency>
39             <groupId>org.apache.commons</groupId>
40             <artifactId>commons-pool2</artifactId>
41         </dependency>
42         <dependency>
43             <groupId>org.springframework.boot</groupId>
44             <artifactId>spring-boot-starter-web</artifactId>
45         </dependency>
46         <dependency>
47             <groupId>org.springframework.cloud</groupId>
48             <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
49         </dependency>
50         <dependency>
51             <groupId>org.springframework.boot</groupId>
52             <artifactId>spring-boot-starter-actuator</artifactId>
53         </dependency>
54 
55     </dependencies>
56 
57     <dependencyManagement>
58         <dependencies>
59             <dependency>
60                 <groupId>org.springframework.cloud</groupId>
61                 <artifactId>spring-cloud-dependencies</artifactId>
62                 <version>${spring-cloud.version}</version>
63                 <type>pom</type>
64                 <scope>import</scope>
65             </dependency>
66         </dependencies>
67     </dependencyManagement>
68 
69     <build>
70         <plugins>
71             <plugin>
72                 <groupId>org.springframework.boot</groupId>
73                 <artifactId>spring-boot-maven-plugin</artifactId>
74             </plugin>
75         </plugins>
76     </build>
77 
78 
79 </project>

配置文件

在application.yml中加入redis、eureka、port等配置

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配置類

 1 package com.carry.config;
 2 
 3 import org.springframework.context.annotation.Configuration;
 4 import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
 5 
 6 @Configuration
 7 @EnableRedisHttpSession
 8 public class RedisSessionConfig {
 9 
10 }

控制層Controller中添加測試方法

 1 package com.carry.controller;
 2 
 3 import javax.servlet.http.HttpServletRequest;
 4 import javax.servlet.http.HttpSession;
 5 
 6 import org.springframework.cloud.context.config.annotation.RefreshScope;
 7 import org.springframework.util.StringUtils;
 8 import org.springframework.web.bind.annotation.GetMapping;
 9 import org.springframework.web.bind.annotation.RestController;
10 
11 @RestController
12 @RefreshScope
13 public class UserManagementController {
14 
15     /**
16      * redis sesion共享
17      * 
18      * @param request
19      * @return
20      */
21     @GetMapping("/getUser")
22     public String getUser(HttpServletRequest request) {
23         HttpSession session = request.getSession();
24         String username = (String) session.getAttribute("username");
25         if (StringUtils.isEmpty(username)) {
26             username = "testSessionRedis|" + System.currentTimeMillis();
27             session.setAttribute("username", username);
28         }
29         System.out.println("訪問端口：" + request.getServerPort());
30         return username;
31     }
32 }

springcloud-session-zuul項目

新建springboot項目，命名springcloud-session-zuul

POM依賴配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>com.carry</groupId>
 8     <artifactId>springcloud-session-zuul</artifactId>
 9     <version>0.0.1-SNAPSHOT</version>
10     <packaging>jar</packaging>
11 
12     <name>springcloud-session-zuul</name>
13     <description>Demo project for Spring Boot</description>
14 
15     <parent>
16         <groupId>org.springframework.boot</groupId>
17         <artifactId>spring-boot-starter-parent</artifactId>
18         <version>2.0.4.RELEASE</version>
19         <relativePath /> <!-- lookup parent from repository -->
20     </parent>
21 
22     <properties>
23         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
24         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
25         <java.version>1.8</java.version>
26         <spring-cloud.version>Finchley.SR1</spring-cloud.version>
27     </properties>
28 
29     <dependencies>
30         <dependency>
31             <groupId>org.springframework.cloud</groupId>
32             <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
33         </dependency>
34         <dependency>
35             <groupId>org.springframework.cloud</groupId>
36             <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
37         </dependency>
38     </dependencies>
39 
40     <dependencyManagement>
41         <dependencies>
42             <dependency>
43                 <groupId>org.springframework.cloud</groupId>
44                 <artifactId>spring-cloud-dependencies</artifactId>
45                 <version>${spring-cloud.version}</version>
46                 <type>pom</type>
47                 <scope>import</scope>
48             </dependency>
49         </dependencies>
50     </dependencyManagement>
51 
52     <build>
53         <plugins>
54             <plugin>
55                 <groupId>org.springframework.boot</groupId>
56                 <artifactId>spring-boot-maven-plugin</artifactId>
57             </plugin>
58         </plugins>
59     </build>
60 
61 
62 </project>

配置文件

server:
  port: 1100
spring:
  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/

啟動類

 1 package com.carry;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
 6 import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
 7 
 8 @EnableEurekaClient
 9 @SpringBootApplication
10 @EnableZuulProxy
11 public class SpringcloudSessionZuulApplication {
12 
13     public static void main(String[] args) {
14         SpringApplication.run(SpringcloudSessionZuulApplication.class, args);
15     }
16 }

測試

依次啟動

eureka-server
springcloud-session-redis
springcloud-session-zuul

多次訪問網關地址http://localhost:1100/user-session/getUser，發現后台輪詢訪問springcloud-session-redis的8090與8091兩個實例

而我們頁面得到的結果是不變的，由此可以說明session是一致的

注意：springcloud項目中經過網關zuul轉發請求后發生session失效問題，這是由於zuul默認會丟棄原來的session並生成新的session，解決方法網關配置文件application.yml 中添加 sensitiveHeaders: “*”

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