springCloud Finchley 微服务架构从入门到精通【十二】整合Redis实现Session共享以及zuul 转发产生的session失效问题

在springcloud微服务项目中，使用redis实现session共享是比较主流的，简单高效，直接代码实践：

1、在pom.xml中添加相关依赖

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-redisartifactId>
        dependency>
        <dependency>  
            <groupId>org.springframework.sessiongroupId>  
            <artifactId>spring-session-data-redisartifactId>  
        dependency> 

2、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/

3、添加redis配置类启用redis代码spring默认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 {

}

4、UserManagementController中添加测试方法

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;
    }
}

5、修改网关配置

springcloud项目中经过网关zuul转发请求后发生session失效问题，这是由于zuul默认会丢弃原来的session并生成新的session，解决方法网关配置文件

service-zuul-dev.yml 中添加 sensitiveHeaders: “*”

server:
  port: 1100
zuul: 
  ignoredServices: '*' #忽略所有未配置的service
  host:
    connect-timeout-millis: 20000
    socket-timeout-millis: 20000
  routes:
    user-service: #自定义名称
      path: /user/**
      serviceId: service-user #/user/开头的路径转发至service-user微服务
      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负载均衡参数配置
  ReadTimeout: 5000
  ConnectTimeout: 5000
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

6、测试

依次启动EUREKA、SERVICE-CONFIG、SERVICE-USER-SESSION-REDIS、SERVICE-ZUUL

多次访问网关地址http://localhost:1100/user-session/getUser

1、发现redis中已经有了session的信息

2、session中的信息为redis中获取的，并且是同一个session

总结：springcloud整合redis实现session共享容易发生错误的地方就是经过网关转发会使原session失效，多数人会认为是整合没有成功，仔细看zuul的源码或者直接访问微服务去尝试，不难发现问题的所在。

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