SpringBoot 如何实现Session共享

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HttpSession，是通过Servlet容器创建并进行管理的，创建成功以后将会保存在内存中，这里将会使用Redis解决session共享的问题。

创建项目

添加pom

添加相关的maven

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.example</groupId>
  <artifactId>demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>demo</name>
  <description>Demo project for Spring Boot</description>

  <properties>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-redis -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-redis</artifactId>
      <version>2.3.1.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/io.lettuce/lettuce-core -->
    <dependency>
      <groupId>io.lettuce</groupId>
      <artifactId>lettuce-core</artifactId>
      <version>6.0.0.M1</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>3.3.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework.session/spring-session-data-redis -->
    <dependency>
      <groupId>org.springframework.session</groupId>
      <artifactId>spring-session-data-redis</artifactId>
      <version>2.3.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

</project>

配置redis连接

配置redis连接

spring:
 redis:
  database: 0
  host: 106.53.115.12
  port: 6379
  password: 12345678
  jedis:
   pool:
    max-active: 8
    max-idle: 8
    max-wait: -1ms
    min-idle: 0

创建Controller用来执行测试操作

package com.example.demo;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpSession;

@RestController
public class HelloController {
  @PostMapping("/save")
  public String saveName(String name, HttpSession session){
    session.setAttribute("name", name);
    return "8080";
  }

  @GetMapping("/get")
  public String getName(HttpSession httpSession){
    return httpSession.getAttribute("name").toString();
  }
}

Nginx 负载均衡

mingming@xiaoming-pc:~$ sudo apt-get install nginx

修改配置文件

upstream sang.com {
    server 192.168.0.1:8080 weight = 1;
    server 192.168.0.2:8080 weight = 1;
}


server {
    listen 80;
    server_name localhost;
    location / {
        proxy_pass http://sang.com;
        proxy_redirect default;
    }

}

请求分发

保存数据