springCloud Finchley 微服務架構從入門到精通【十二】整合Redis實現Session共享

在springcloud微服務項目中，使用redis實現session共享是比較主流的，簡單高效，直接代碼實踐：

一、在pom.xml中添加相關依賴

<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>

二、添加redis配置

service-user-session-redis-dev.yml

server:
  port: 8831
management: 
  endpoints:
    web:
      exposure: 
        include: "*"
      cors:
        allowed-origins: "*"
        allowed-methods: "*" 
spring: 
  redis:
    database: 0
    host: 192.168.248.131
    port: 6379
    password: 
    timeout: 20000
    #cluster:
      #nodes: 192.168.211.134:7000,192.168.211.134:7001
      #- 
      #max-redirects: 
    jedis:
      pool:
        max-active: 8
        max-wait: -1
        max-idle: 8
        min-idle: 0
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

三、添加redis配置類啓用redis代碼spring默認session

RedisSessionConfig

package com.mayi.springcloud.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;

@Configuration
@EnableRedisHttpSession
public class RedisSessionConfig {

}

四、UserManagementController中添加測試方法

package com.mayi.springcloud.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Value;
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)){
            session.setAttribute("username", "testSessionRedis|" + System.currentTimeMillis());
        }
        return username;
    }
}

五、修改網關配置

springcloud項目中通過網關zuul轉發請求後發生session失效問題，這是因爲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

service-zuul-dev.yml 中添加 sensitiveHeaders: "*"

server:
  port: 1100
zuul: 
  ignoredServices: '*' #忽略全部未配置的service
  host:
    connect-timeout-millis: 20000
    socket-timeout-millis: 20000
  routes:
    user-service: #自定義名稱
      path: /user/**
      serviceId: service-user #/user/開頭的路徑轉發至service-user微服務
      sensitiveHeaders: "*"
    user-redis-session-service: 
      path: /user-session/**
      serviceId: service-user-session-redis
      sensitiveHeaders: "*" 
hystrix: #hystrix配置
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 2500 
ribbon: #ribbon負載均衡參數配置
  ReadTimeout: 5000
  ConnectTimeout: 5000
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

六、測試

依次啓動EUREKA、SERVICE-CONFIG、SERVICE-USER-SESSION-REDIS、SERVICE-ZUUL

屢次訪問網關地址http://localhost:1100/user-session/getUser

一、發現redis中已經有了session的信息

二、session中的信息爲redis中獲取的，而且是同一個session

總結：springcloud整合redis實現session共享容易發生錯誤的地方就是通過網關轉發會使原session失效，多數人會認爲是整合沒有成功，仔細看zuul的源碼或者直接訪問微服務去嘗試，不難發現問題的所在。

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