Redis集群利用Redisson实现分布式锁方式_Redis

redisson实现集群环境下的分布式锁十分简单：

引入依赖

<?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>2.1.8.release</version>
        <relativepath/> <!-- lookup parent from repository -->
    </parent>
    <groupid>com.lk</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>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-web</artifactid>
        </dependency>

        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-devtools</artifactid>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-test</artifactid>
            <scope>test</scope>
        </dependency>
        //redis起步依赖
        <dependency>
            <groupid>org.springframework.boot</groupid>
            <artifactid>spring-boot-starter-data-redis</artifactid>
            <version>2.1.7.release</version>
        </dependency>
        //redisson起步依赖
        <dependency>
            <groupid>org.redisson</groupid>
            <artifactid>redisson-spring-boot-starter</artifactid>
            <version>3.11.2</version>
        </dependency>
        <dependency>
            <groupid>mysql</groupid>
            <artifactid>mysql-connector-java</artifactid>
            <version>5.1.48</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupid>org.springframework.boot</groupid>
                <artifactid>spring-boot-maven-plugin</artifactid>
            </plugin>
        </plugins>
    </build>

</project>

redisson配置类

package com.lk.demo.redissionconfig;

import org.redisson.redisson;
import org.redisson.api.redissonclient;
import org.redisson.config.config;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.configuration;

/*
* redisson的配置类，提供redissonclient实例
* */
@configuration
public class redissionconfiguration {

    @bean
    public redissonclient getredissionclient(){
        config config=new config();
        //集群模式,集群节点的地址须使用“redis://”前缀，否则将会报错。
        //此例集群为3节点，各节点1主1从
        config.useclusterservers().addnodeaddress("redis://192.168.37.134:7001","redis://192.168.37.134:7002",
                "redis://192.168.37.134:7003","redis://192.168.37.134:7004","redis://192.168.37.134:7005","redis://192.168.37.134:7006");
        return redisson.create(config);
    }
}

分布式锁

package com.lk.demo.redissionconfig;

import org.redisson.api.rlock;
import org.redisson.api.redissonclient;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.beans.factory.annotation.qualifier;
import org.springframework.data.redis.core.redistemplate;
import org.springframework.stereotype.repository;


import java.util.concurrent.timeunit;

/*
* 利用redissonclient部署及解除分布式锁
* 直接调用lock、unlock方法，此方法只允许1个线程取得锁，其余线程将自旋等待
* */

@repository
public class handlerlock{
    @autowired
    private redistemplate<string,string> rt;
    //@qualifier("redisson") //在org.redisson.spring.starter包中，可以从配置文件读取redis配置，并返回redissonclient对象
    @qualifier("getredissionclient")//指定从本地自写的class中取得实例
    @autowired
    private redissonclient redissonclient;
    //实验方法，测试分布式锁
    public void dolock(string lockname){
        //从redissonclient取得rlock实例
        rlock rlock=redissonclient.getlock(lockname);
        //尝试取锁，有效期为3s，到期后自动释放。如果取得锁继续执行。取锁失败则自旋。
        //亦可使用rlock.trylock（）方法，此方法也为尝试取锁，并返回boolean结果
        rlock.lock(3,timeunit.seconds);
        //以下为测试业务代码，
        system.out.println(thread.currentthread().getname()+"取得锁");
        int store=integer.valueof(rt.opsforvalue().get("store"));
        if(store>0)
        {
            system.out.printf("售出1,当前库存为%d\n",--store);
            rt.opsforvalue().set("store",string.valueof(store));
        }else
            system.out.println("已售完，下次再来吧");
        //业务完成，释放锁
        rlock.unlock();
        system.out.println("解锁");
    }
}

测试controller

@controller
public class controllerdemo {
    @autowired
    private handlerlock handlerlock;
    @requestmapping("/hello")
    @responsebody
    public void demo(){
        handlerlock.dolock("luking");
    }

}