We all know how to achieve Redis Distributed locks are used Redis Of setnx command , This command will be implemented in key Only when it doesn't exist can it be set successfully , In general scenarios, this method can realize simple distributed locks , But there are many problems with this approach , For example, the problem of lock expiration ,setnx And lock expiration commands expire There are two separate commands , Execution is not atomic , Of course, there are other problems , We will introduce them one by one later .

Redisson The framework encapsulates many implementation details of distributed locks for us , We can use a few simple commands to achieve a relatively perfect distributed lock .

So let's do that Springboot Integrate redisson Let's fight .

1、 First we need to introduce redisson The dependency package of

<?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>com.liupeng</groupId>
<artifactId>redis-test</artifactId>
<version>1.0</version>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</p