分布式session之redis解决方案实现

 

一、首先Session

 

Session 是客户端与服务器通讯会话技术, 比如浏览器登陆、记录整个浏览会话信息。session存放在服务器,关闭浏览器不会失效。

Session实现原理

客户对向服务器端发送请求后,Session 创建在服务器端,返回Sessionid给客户端浏览器保存在本地,当下次发送请求的时候,在请求头中传递sessionId获取对应的从服务器上获取对应的Sesison

 

 

请求过程: 

 服务器端接受到客户端请求,会创建一个session,使用响应头返回 sessionId给客户端。客户端获取到sessionId后,保存到本地。

下次请求:客户端将本地的sessionId通过请求头发送到服务器。服务器从请求头获取到对应的sessionId,使用sessionId在本地session内存中查询。

 

 

HttpSession session = request.getSession();  //默认创建一个session  默认值为true  没有找到对应的session 自动创建session

HttpSession session = request.getSession(false) //true的情况是 客户端使用对应的sessionId查询不到对应的session 会直接创建一个新的session  如果有的话直接覆盖之前的

                                                                               //false               客户端使用对应的sessionId查询不到对应的session   不会创建新的session

 

    session 包括 sessionId和sessionValue    

    session本身是临时的  token(令牌)与  sessionId很相似   保证了临时且唯一

    

玩下session:

前提需要安装nginx

配置如下:

 

host文件:c:\windows\system32\drivers\etc

访问 www.toov5.com时候 走的nginx的服务器域名 然后默认监听的端口号80。 进而通过配置upstream 负载均衡!

 

lz在玩时候,弄到了半夜,也没排查出来原因,妈的气死了! 地址写成了 127.0.0.1  

yml:

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server:
  port: 8080  

pom:

 

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<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.toov5.loveCode</groupId>
  <artifactId>loveCode</artifactId>
  <version>0.0.1-SNAPSHOT</version>
   
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <weixin-java-mp.version>2.8.0</weixin-java-mp.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.build.locales>zh_CN</project.build.locales>
    </properties>
 
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!-- <exclusions> <exclusion> <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId> </exclusion> </exclusions> -->
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
        <!-- Testing Dependencies -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!--spring session 与redis应用基本环境配置,需要开启redis后才可以使用,不然启动Spring boot会报错 -->
        <!-- <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>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
 
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <maimClass>com.meiteedu.WxMpApplication</maimClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
 
            </plugin>
        </plugins>
    </build>
   
</project>

  

服务器端代码:

复制代码
package com.toov5.loveCode;

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

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class TestSessionController {
    @Value("${server.port}")
    private String serverPort;

    @RequestMapping("/")
    public String index() {
        return serverPort;
    }

    // 创建session 会话
    @RequestMapping("/createSession")
    public String createSession(HttpServletRequest request, String nameValue) {
        // 默认 创建一个session,
        HttpSession session = request.getSession();
        System.out.println(
                "存入Session  sessionid:信息" + session.getId() + ",nameValue:" + nameValue + ",serverPort:" + serverPort);
        session.setAttribute("name", nameValue);
        return "success-" + serverPort;
    }

    // 获取session 会话
    @RequestMapping("/getSession")
    public Object getSession(HttpServletRequest request) {
        // 设置为true 情况下的时候,客户端使用对应的sessionid 查询不到对应的sesison 会直接创建一个新的session
        // 设置为false 情况下的时候,客户端使用对应的sessionid 查询不到对应的sesison 不 会直接创建一个新的session
        HttpSession session = request.getSession(true);
        if (session == null) {
            return serverPort + "  该服务器上没有存放对应的session值";
        }
        System.out.println("获取Session sessionid:信息" + session.getId() + "serverPort:" + serverPort);
        Object value = session.getAttribute("name");
        return serverPort + "-" + value;
    }

}
复制代码

 

启动类:启动两次 端口号修改8080、 8081

复制代码
package com.toov5.loveCode;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;


@EnableAutoConfiguration
@SpringBootApplication
public class AppSession {

    public static void main(String[] args) {
        SpringApplication.run(AppSession.class, args);
    }

}
复制代码

运行结果:8080 和 8081来回切换 负载均衡

调用服务器端方法: fist 存放在8080

查询不到哦!

 

8081 没有  就创建新的session  覆盖原来的sessionId    true没有就创建   

下次 又去8080 又没有 又创建 来回折腾..............

此时:

修改false  没有时候不创建 

 

然后传入 value 然后继续轮训访问;

 

二、分布式Session

        

       1、直接使用cookie替代session 不安全(存客户端)

        2、Nginx的IP绑定  目的是同一个IP只能指定同一个机器访问(相当于没做集群了)

        3、 使用数据库(效率低)

        4、tomcat内置Session同步,通过广播可能产生延迟,占用带宽

        5、使用 Spring-Session框架,相当于把session缓存缓存到redis中 (  缓存框架,缓存Session的值 )

        6、可以使用token替代session功能。自定义令牌替代session

 

 Spring-Session 重写httpsession框架,将对应的值缓存到redis中,有点类似于一级、二级缓存。

 

必须要有的!

yml文件:

 

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<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.toov5.loveCode</groupId>
  <artifactId>loveCode</artifactId>
  <version>0.0.1-SNAPSHOT</version>
   
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <weixin-java-mp.version>2.8.0</weixin-java-mp.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.build.locales>zh_CN</project.build.locales>
    </properties>
 
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!-- <exclusions> <exclusion> <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId> </exclusion> </exclusions> -->
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
        <!-- Testing Dependencies -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!--spring session 与redis应用基本环境配置,需要开启redis后才可以使用,不然启动Spring boot会报错 -->
           <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>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
 
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <maimClass>com.meiteedu.WxMpApplication</maimClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
 
            </plugin>
        </plugins>
    </build>
   
</project>

 非常非常重要的:一定要jredis引入  同时这个对session提供了大力支持哈哈

 

yml 的redis配置文件:

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server:
  port: 8080
 
redis:
  hostname: 192.168.91.3    
  port:  6379
  password:  123

  

 后台业务逻辑:

复制代码
package com.toov5.loveCode;

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

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class TestSessionController {
    @Value("${server.port}")
    private String serverPort;

    @RequestMapping("/")
    public String index() {
        return serverPort;
    }

    // 创建session 会话
    @RequestMapping("/createSession")
    public String createSession(HttpServletRequest request, String nameValue) {
        // 默认 创建一个session,
        HttpSession session = request.getSession();
        System.out.println(
                "存入Session  sessionid:信息" + session.getId() + ",nameValue:" + nameValue + ",serverPort:" + serverPort);
        session.setAttribute("name", nameValue);
        return "success-" + serverPort;
    }

    // 获取session 会话
    @RequestMapping("/getSession")
    public Object getSession(HttpServletRequest request) {
        // 设置为true 情况下的时候,客户端使用对应的sessionid 查询不到对应的sesison 会直接创建一个新的session
        // 设置为false 情况下的时候,客户端使用对应的sessionid 查询不到对应的sesison 不 会直接创建一个新的session
        HttpSession session = request.getSession(false);
        if (session == null) {
            return serverPort + "  该服务器上没有存放对应的session值";
        }
        System.out.println("获取Session sessionid:信息" + session.getId() + "serverPort:" + serverPort);
        Object value = session.getAttribute("name");
        return serverPort + "-" + value;
    }

}
复制代码

配置:

复制代码
package com.toov5.loveCode;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;

//这个类用配置redis服务器的连接
//maxInactiveIntervalInSeconds为SpringSession的过期时间(单位:秒)
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 1800)
public class SessionConfig {

    // 冒号后的值为没有配置文件时,制动装载的默认值
    @Value("${redis.hostname:localhost}")
    String HostName;
    @Value("${redis.port:6379}")
    int Port;
    @Value("${redis.password}") 
    String password;
    
    @Bean
    public JedisConnectionFactory connectionFactory() {
        JedisConnectionFactory connection = new JedisConnectionFactory();
        connection.setPort(Port);
        connection.setHostName(HostName);
        connection.setPassword(password);
        return connection;
    }
}
复制代码

初始化:

复制代码
package com.toov5.loveCode;

import org.springframework.session.web.context.AbstractHttpSessionApplicationInitializer;

//初始化Session配置
public class SessionInitializer extends AbstractHttpSessionApplicationInitializer{
    public SessionInitializer() {
        super(SessionConfig.class);
    }
}
复制代码

启动类:

复制代码
package com.toov5.loveCode;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;


@EnableAutoConfiguration
@SpringBootApplication
public class AppSession {

    public static void main(String[] args) {
        SpringApplication.run(AppSession.class, args);
    }

}
复制代码

虽然是存放在8081,但是访问时候 都有哦~ 大家试试玩玩吧~~

 

 引入的jar包重写了 HttpSession类  去解决Session共享问题

而此时的:redis

控制台:

 

补充:

 Spring Boot 整合redis: 

 

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server:
  port: 8080
spring:
  redis:
    database: 0  
    host:  192.168.91.3
    port:  6379
    password:  123
    jedis:
      pool:
        max-active: 8
        max-wait: -1
        max-idle: 8
        min-idle: 0
    timeout: 10000
redis:
  hostname: 192.168.91.3    
  port:  6379
  password:  123

  

 

 

   

 

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