redission实现分布式锁（文字少，都是代码)

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基于Redis方式实现分布式锁 立即下载

redission实现分布式锁（文字少，都是代码)

redission是最好用的客户端，底层由netty实现，可以说是一个可以操作redis的框架，实现很多功能，包括分布式锁，本章让我们看一下分布式锁怎么实现

1.创建一个springboot工程，导入maven依赖, 创建application.yml并添加配置

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>redission-code</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.3.2.RELEASE</version>
        </dependency>
        <!-- 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>2.3.5.RELEASE</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.redisson/redisson-spring-boot-starter -->
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson-spring-boot-starter</artifactId>
            <version>3.12.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>
<!--        mysql连接-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.23</version>
        </dependency>
<!--        自动生成代码-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.1</version>
        </dependency>
<!--        velocity模板-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.0</version>
        </dependency>
<!--        swagger-->
        <!--swagger-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!--swagger ui-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!--swagger-bootstrap-ui-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>swagger-bootstrap-ui</artifactId>
            <version>1.9.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>

    </dependencies>
</project>

spring:
  profiles:
    active: dev # 环境设置
  application:
    name: service-core # 服务名
  datasource: # mysql数据库连接
    type: com.zaxxer.hikari.HikariDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://host:3306/seckill?serverTimezone=GMT%2B8&characterEncoding=utf-8
    username: root
    password: root
  redis:
    host: host
    password: 123456
    database: 0
    port: 6380

#mybatis xml文件地址
#mybatis-plus:
#  configuration:
#    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
#    mapper-locations: classpath:com/levi/mapper/xml/*.xml


redission:
  address: redis://192.168.177.129:6380
  password: 123456

2.数据库建表用于测试，表明 product表结构如下
id，产品名称，库存在这里插入图片描述
3.使用mybatisplus逆向生成工程,代码如下,执行之后生成

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import org.junit.Test;

/**
 * @ClassName CodeGenerator
 * @Description TODO
 * @Author Levi
 * @Date 2021/4/14 10:41
 **/
public class CodeGenerator {
    @Test
    public void genCode() {

        // 1、创建代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 2、全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor("levi");
        gc.setOpen(false); //生成后是否打开资源管理器
        gc.setServiceName("%sService");	//去掉Service接口的首字母I
        gc.setIdType(IdType.AUTO); //主键策略
        gc.setSwagger2(true);//开启Swagger2模式
        mpg.setGlobalConfig(gc);

        // 3、数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://192.168.177.129:3306/seckill?serverTimezone=GMT%2B8&characterEncoding=utf-8");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("St1282001316*");
        dsc.setDbType(DbType.MYSQL);
        mpg.setDataSource(dsc);

        // 4、包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.levi");
        pc.setEntity("pojo"); //此对象与数据库表结构一一对应，通过 DAO 层向上传输数据源对象。
        mpg.setPackageInfo(pc);

        // 5、策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);//数据库表映射到实体的命名策略

        strategy.setColumnNaming(NamingStrategy.underline_to_camel);//数据库表字段映射到实体的命名策略
        strategy.setEntityLombokModel(true); // lombok
        strategy.setLogicDeleteFieldName("is_deleted");//逻辑删除字段名
        strategy.setEntityBooleanColumnRemoveIsPrefix(true);//去掉布尔值的is_前缀（确保tinyint(1)）
        strategy.setRestControllerStyle(true); //restful api风格控制器
        mpg.setStrategy(strategy);

        // 6、执行
        mpg.execute();
    }
}

4.创建一个service接口，并且实现里面的方法

package com.levi.service;

public interface SecKillService {

    boolean buyProduct(Integer id, Integer quantity) throws Exception;
}

package com.levi.service.impl;

import com.levi.mapper.ProductMapper;
import com.levi.pojo.Product;
import com.levi.service.SeckillService;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;

@Service
public class SeckillServiceImpl implements SeckillService {

    @Autowired
    private RedissonClient redissonClient;

    @Resource
    ProductMapper productMapper;

    @Override
    public boolean buyProduct(Integer id, Integer quantity) {
        RLock lock = null;
        try {
            lock = redissonClient.getLock("sec_kill" + id);
//            获得公平锁，先到先得
//            lock = redissonClient.getFairLock("Sec_kill" + id);
            lock.tryLock(2, 5, TimeUnit.SECONDS);
            Product product = productMapper.selectById(id);
            //如果产品的库存为0或者库存数量小于购买数量则返回false
            if (product.getStack() == 0 || product.getStack()<quantity) {
                return false;
            }
            //购买，扣库存
            product.setStack(product.getStack() - quantity);
            productMapper.updateById(product);

        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
        return true;
    }
}

5.创建controller用于测试，每个人只能买一个

package com.levi.controller;

import com.levi.service.SeckillService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Slf4j
@RequestMapping("redission")
public class SeckillController {
    @Autowired
    private SeckillService seckillService;

    @GetMapping("secKill")
    public void secKill() {
        if (!seckillService.buyProduct(1,1)) {
            log.info("{}商品库存不足",Thread.currentThread().getName());
        }else {
            log.info("{}购买商品成功",Thread.currentThread().getName());
        }
    }
}

6.启动类启动

package com.levi;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan(basePackages = {"com.levi.mapper"})
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}