1.创建一个demo项目

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</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-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.配置DemoApplication文件

@SpringBootApplication
@EnableCaching
public class DemoApplication {


    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
    
}

3.编写DemoController

@RestController
public class DemoController {
    @Autowired
    private DemoService demoService;

    @GetMapping("demo")
    public boolean demo(@RequestParam("id") Integer id){
        return demoService.demo(id);
    }
}

4.编写DemoService

package com.example.demo;

import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

@Service
public class DemoService {

    /**
     * 当id大于10时使用缓存
     * 当id小于或等于10时不使用缓存
     * @param id
     * @return
     */
    @Cacheable(value = "id",key = "#id",condition = "#id>10")
    public boolean demo(Integer id){
        System.out.println("---->未使用缓存");
        if(id==20){
           return true;
        }else{
            return false;
        }

    }

}

5.配置服务端口

server.port=1111

6.测试

http://127.0.0.1:1111/demo?id=10

7.spring-boot使用tools-redis实现分布式缓存