1.SpringCache的概念
首先我们知道jpa,jdbc这些东西都是一些规范，比如jdbc，要要连接到数据库，都是需要用到数据库连接，预处理，结果集这三个对象，无论是连接到mysql还是oracle都是需要用到这个三个对象的，这是一种规范，而SpringCache是一种作为缓存的规范，具体实现有redis,EhCahe等
2.SpringCache用法（redis版）
2.1 .SpringCache基本用法
1.pom.xml
<?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>2.6.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.yl</groupId>
<artifactId>cache_redis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>cache_redis</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.application.properties
# redis的配置
spring.redis.host=192.168.244.135
spring.redis.port=6379
spring.redis.password=root123
3.实体类
package com.yl.cache_redis.domain;
import java.io.Serializable;
public class User implements Serializable {
private Integer id;
private String username;
private String password;
public Integer getId（） {
return id;
}
public void setId（Integer id） {
this.id = id;
}
public String getUsername（） {
return username;
}
public void setUsername（String username） {
this.username = username;
}
public String getPassword（） {
return password;
}
public void setPassword（String password） {
this.password = password;
}
@Override
public String toString（） {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}
4.service
package com.yl.cache_redis;
import com.yl.cache_redis.domain.User;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Cacheable（cacheNames = "u1"） //这个注解作用就是将方法的返回值存到缓存中
public User getUserById（Integer id） {
System.out.println（"getUserById:" + id）;
User user = new User（）;
user.setId（id）;
user.setUsername（"root"）;
user.setPassword（"root"）;
return user;
}
}
5.主程序，加上开启缓存的注解
package com.yl.cache_redis;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@SpringBootApplication
@EnableCaching //开启缓存功能
public class CacheRedisApplication {
public static void main（String[] args） {
SpringApplication.run（CacheRedisApplication.class, args）;
}
}
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