redis分布式锁(二)--redisson

使用Redisson 分布式锁

application.yml

##端口号
server.port=8001

# Redis数据库索引（默认为0）
spring.redis.database=0 
# Redis服务器地址
spring.redis.host=localhost
# Redis服务器连接端口
spring.redis.port=6379 
# Redis服务器连接密码（默认为空）
spring.redis.password=
#连接池最大连接数（使用负值表示没有限制）
spring.redis.pool.max-active=8 
# 连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.pool.max-wait=-1 
# 连接池中的最大空闲连接
spring.redis.pool.max-idle=8 
# 连接池中的最小空闲连接
spring.redis.pool.min-idle=0 
# 连接超时时间（毫秒）
spring.redis.timeout=300

POM.xml 增加Redisson相关依赖

<?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>2.2.6.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wanjun.redis</groupId>
    <artifactId>redis-lock</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>redis-lock</name>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.redisson</groupId>
            <artifactId>redisson</artifactId>
            <version>3.12.5</version>
        </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>

启动类 

@SpringBootApplication
public class RedisLockApplication {

    public static void main(String[] args) {
        SpringApplication.run(RedisLockApplication.class, args);
    }
    @Bean
    public RedissonClient getRedisClient() {
        Config config = new Config();
        config.useSingleServer().setAddress("redis://127.0.0.1:6379").setDatabase(0);
        return Redisson.create(config);
    }
}

StockController.java

改为使用redisson锁

@RestController
public class StockController {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private RedissonClient redisson;
    
    @RequestMapping("/deduct_stock")
    public String decuctStock() throws Exception {
        String stockLock = "stockLock";
        RLock redissLock = redisson.getLock(stockLock);
        try {
            redissLock.lock();
            int stock = Integer.parseInt(stringRedisTemplate.opsForValue().get("stock"));
            if (stock > 0) {int realStock = stock - 1;
                stringRedisTemplate.opsForValue().set("stock", realStock + "");
                System.out.println("扣减成功，剩余库存：" + realStock);
            } else {
                System.out.println("扣减失败，库存不足");
            }
        } finally {
            redissLock.unlock();
        }
        return "success";
    }
}

依次启动项目 端口 8001，8002

代码下载：https://github.com/wanun/redis-lock