系统环境：win10

编辑器：IDEA

<?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>org.javaboy</groupId>

    <artifactId>chapter09-cacheredis</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>chapter09-cacheredis</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-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-security</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.security</groupId>

            <artifactId>spring-security-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>

spring.redis.host=127.0.0.1

spring.redis.password=123456

spring.redis.port=6379

spring.redis.database=0

spring.cache.cache-names=c1

@Component

public class MyKeyGen implements KeyGenerator {

    @Override

    public Object generate(Object o, Method method, Object... objects) {

        return method.getName()+":"+ Arrays.toString(objects);

    }

@Service

//@CacheConfig(cacheNames = "c1")

public class BookService {

//    key = "#methodName"

//    key = "#method.name"

//    key = "#caches[0]"

//    key = "#args[0]"

//    @Cacheable(cacheNames = "c1",key = "#caches[0]")

    @Cacheable(cacheNames = "c1",key = "'myKeyGen'")

    public Book getUserById(Integer id){

        System.out.println("book>>>>>>" + id);

        Book book = new Book();

        book.setId(id);

        return book;

    }

}

    @Autowired

    BookService bookService;

    @Test

    public void contextLoads() {

        Book book = bookService.getUserById(1);

        Book book1 = bookService.getUserById(1);

        System.err.println("book --->>" + book);

        System.err.println("book1 --->>" + book1);

    }

key = "''" (需要内嵌一下单引号 不然会报错)