How SpringBoot introduces redis

Redis is an in-memory database that can cache data that needs to be accessed frequently to Redis, which can greatly improve access efficiency.

Here’s how to use it:

1. Install the windows version of redis

After downloading, unzip it;

In the directory where you unzip it Use the following command to start the server: (Since the win10 powershell is used here, you need to add ./, or you can avoid using ./ by configuring environment variables)

./redis-server.exe redis.windows.conf

　　　　 // It will not be registered as windows here. After the service is completed, close the window and close redis

Start the command terminal:

./redis-cli.exe -h 127.0.0.1 -p 6379

2. Introduce dependencies

 <!-- springboot整合redis -->  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-data-redis</artifactId>  
        </dependency>

Just introduce this One redis dependency is sufficient, and the other three are automatically dependent:

3. Configure redis in application.yml

spring.redis.host=127.0.0.1
#Redis server connection port
spring.redis.port=6379
#Redis server connection password (default is empty)
spring.redis.password=
#Maximum number of connections in the connection pool (use a negative value to indicate no limit)
spring.redis.pool.max-active=8
#Maximum blocking waiting time of the connection pool (use a negative value to indicate no limit)
spring.redis.pool.max-wait=-1
#The maximum idle connection in the connection pool
spring.redis.pool.max-idle=8
#The minimum idle connection in the connection pool
spring.redis.pool.min-idle=0
#Connection timeout (milliseconds)
spring.redis.timeout=30000

4. Register Redis as a local service

Normally we can start the redis service through redis-server.exe and the configuration file:

redis-server.exe redis. windows.conf

Also open a command line window redis-cli.exe to do some simple operations. Command line

But if we close the console, the Redis service will also be closed together. When you want to use it, you have to execute the command to restart the redis service, which is very inefficient and troublesome.

There is a concept of local service in Windows. Our goal is to register Redis as a service here, and then it will not be affected by console exit.

Register as a local service:

redis-server.exe --service-install redis.windows.conf

From the picture, we can see that the authorization and registration have been successful. Next, we go to the windows service (right-click the windows menu-"Computer Management-"Services and Applications-"Services) to see if there is a redis service. ：

Command regulation

Register service redis-server --service-install redis.windows.conf

Delete service redis-server --service-uninstall

Start the service redis-server --service-start

Stop the service redis-server --service-stop

5.Usage of Redis

    @Autowired
    private StringRedisTemplate redisTmp;

    @GetMapping("/api/setkey")
    public String setkey(String keyname,String keyvalue){
        String value = "Set Value OK";
        try{
            redisTmp.opsForValue().set(keyname,keyvalue);
        }catch (Exception ex){
            value = "Set Error :"+ex.getMessage();
        }

        return value;
    }
    @GetMapping("/api/getkey")
    public String getkey(String keyname){
        String str = "";
        try {
            Boolean isHas = redisTmp.hasKey(keyname);
            if (isHas){
                str = redisTmp.opsForValue().get(keyname).toString();
            }else {
                str = "抱歉！不存在key值为"+keyname;
            }
        } catch (Exception ex){
            str = ex.getMessage();
        }
        return str;
    }

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