SpringBoot中利用redis实现session共享

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2021-08-14 03:25

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虽然我的CRM系统现在还没有使用负载均衡,没有使用多机。但是session共享是必须要考虑的事情。各位可能都是大牛,但是保不齐有不知道的,先介绍下负载均衡和session共享方面的知识:

        由于我们的用户越来越多,并发量越来越高,一台机器无法应付所有请求,获取为了系统安全,一台机器坏了,网站系统还能正常访问,我们可以考虑用nginx做负载均衡服务器,将请求分发到不同的tomcat服务器处理(本处只介绍nginx做负载均衡tomcat做java服务器),集群框架如下图所示:


从图中我们看出负载均衡后,我们的请求会分发到其中的一个tomcat中去,我们知道session是在机器的内存中,那么由于我们的连续请求可能是在不同的机器去处理,那么很可能前一次请求的session后一次无法取得,如何解决这个问题?redis为我们提供了很好的session共享方案。

        我们的CRM是采用spring boot 开发的,在spring boot里面可以非常方便的集成redis,通过redis实现session共享,下面我就给大家介绍下具体的实现。

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
    </dependency>
    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>2.8.1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-redis</artifactId>
        <!--<version>1.0.2.RELEASE</version>-->
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <!--<version>2.8.0</version>-->
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.0.0</version>
    </dependency>
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>javase</artifactId>
        <version>3.0.0</version>
    </dependency>
    <dependency>
        <groupId>com.aliyun.oss</groupId>
        <artifactId>aliyun-sdk-oss</artifactId>
        <version>2.8.2</version>
    </dependency>
    <dependency>
        <groupId>net.sf.json-lib</groupId>
        <artifactId>json-lib</artifactId>
        <version>2.4</version>
        <classifier>jdk15</classifier>
    </dependency>
    <dependency>
        <groupId>org.springframework.session</groupId>
        <artifactId>spring-session-data-redis</artifactId>
        <version>1.2.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.4.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpcore</artifactId>
        <version>4.4.1</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.39</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-thymeleaf -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
        <version>1.4.0.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <version>1.5.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.10</version>
    </dependency>
    <!-- alibaba的druid数据库连接池 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.11</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.datatype</groupId>
        <artifactId>jackson-datatype-joda</artifactId>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.module</groupId>
        <artifactId>jackson-module-parameter-names</artifactId>
    </dependency>
    <!-- 分页插件 -->
    <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper-spring-boot-starter</artifactId>
        <version>1.1.2</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.1.0</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-core</artifactId>
        <version>1.1.9</version>
    </dependency>
</dependencies>

以上是maven 的pom依赖设置,和redis相关的是

        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-redis</artifactId>  
            <version>1.4.6.RELEASE</version>  
        </dependency> 


    <dependency>  
        <groupId>org.springframework.session</groupId>  
        <artifactId>spring-session-data-redis</artifactId>  
          
    </dependency> 


spring-session-data-redis 支持redis session 共享


application.yml 配置如下,这个配置让我们的系统客户获取redis的连接。

logging:  
  config: classpath:logback.xml  
  path: d:/logs  
server:  
  port: 8080  
  session-timeout: 60  
  
spring:  
    redis:  
       database: 0  
       host: 127.0.0.1  
       port: 6379  
       password:  
       timeout: 0  
       pool:  
           max-active: 8  
           max-wait: -1  
           max-idle: 8  
           min-idle: 0  
    session:  
      store-type: none 

有点朋友是用application.properties的,只是编写的结构不一样,内容一一对应就好了。

接下来就是编写config文件,使我们的系统能支持redis缓存session共享

新建一个java文件 


package com.hzucan.crmConfig;
import
org.springframework.context.annotation.Configuration;
import
org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
/**
* Created by tongjianbin on 18/4/17.
*/
@Configuration
@EnableRedisHttpSession
(maxInactiveIntervalInSeconds = 1800)
public class RedisSessionConfig {

}



@EnableRedisHttpSession(maxInactiveIntervalInSeconds 1800)

用于指定sess的过期时间,默认是30分钟,可以按系统的实际情况改写maxInactiveIntervalInSeconds,设置session过期时间。


在写完配置类后,前万记得要在在spring boot的启动类上写上注解@EnableRedisHttpSession


@SpringBootApplication
@EnableCaching
@EnableRedisHttpSession
@EnableTransactionManagement
@ComponentScan
(basePackages = "com.hzucan")
@MapperScan(basePackages = "com.hzucan.mapper")
@EntityScan(basePackages = "com.hzucan.entity")
public class Entry {
public static void main(String[] args) throws Exception{
SpringApplication.run(Entry.class,args);
}
}

接下来写一个测试类来进行测试


@EnableRedisHttpSession
@Controller
@RequestMapping
(value= "/")
public class IndexController {
@Autowired
private UserService userService;
@Autowired
HttpServletRequest request;
@Autowired
HttpServletResponse response;
@Autowired
HttpSession httpSession;

@RequestMapping(value="/getSessionId")
@ResponseBody
public String getSessionId(HttpServletRequest request){Object o = httpSession.getAttribute("springboot");
if
(o == null){
o = "spring boot 牛逼了!!!有端口"+request.getLocalPort()+"生成";
httpSession.setAttribute("springboot", o);
}

return "端口=" + request.getLocalPort() + " sessionId=" + request.getSession().getId() +"<br/>"+o;
}}

启动springboot, 访问http://localhost:8080/getSessionId


网页上显示如下内容:

端口=8080 sessionId=5F1FB48698294843039010C1B8253B0D

spring boot 牛逼了!!!有端口8080生成

我们再查看redis


当session 失效的时候,我们再查看redis,发现session相关的key已经没有了,虽然我们这里是使用了单台设备,但是通过看key是否存在redis里面,可以大致证明是否实现 了redis session共享,因为虽然负责均衡会让我们的请求转发到不同的服务器,但是cookie里面的sessionId是不会变的,都会到同一个redis里面去查询session。

好了,到此已经在我的crm里面通过redis 实现了session共享。

  作者 |  steventongjianbin

来源 |  csdn.net/steventongjianbin/article/details/80012109


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