SpringBoot EhCaching

<?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>2.3.0.M2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.nhooo</groupId>
<artifactId>spring-boot-ehcache-example</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-boot-ehcache-example</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-cache</artifactId>
</dependency>
<dependency>
<groupId>org.ehcache</groupId>
<artifactId>ehcache</artifactId>
</dependency>
<dependency>
<groupId>javax.cache</groupId>
<artifactId>cache-api</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</pluginRepository>
</pluginRepositories>
</project>

#配置 ehcache.xml
spring.cache.jcache.config=classpath:ehcache.xml

package com.nhooo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@SpringBootApplication
//啟用緩存管理功能
@EnableCaching
public class SpringBootEhcacheExampleApplication 
{
    public static void main(String[] args) 
    {
        SpringApplication.run(SpringBootEhcacheExampleApplication.class, args);
    }
}

package com.nhooo;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Configuration;
@Configuration
//enable caching
@EnableCaching
public class CacheConfig 
{
}

package com.nhooo;
public class Student 
{
    private int id;
    private String name;
    private String gender;
    private String city;
    public Student(int id, String name, String gender, String city) 
    {
        super();
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.city = city;
    }
    public int getId() 
    {
    return id;
    }
    public void setId(int id) 
    {
    this.id = id;
    }
    public String getName() 
    {
    return name;
    }
    public void setName(String name) 
    {
    this.name = name;
    }
    public String getGender() 
    {
    return gender;
    }
    public void setGender(String gender) 
    {
    this.gender = gender;
    }
    public String getCity() 
    {
    return city;
    }
    public void setCity(String city) 
    {
    this.city = city;
    }
    @Override
    public String toString() 
    {
        return "Student [id=" + id + ", name=" + name + ", gender=" + gender + ", city=" + city + "]";
    }
}

StudentManager.java
package com.nhooo;
import java.util.HashMap;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
@Service
public class StudentManager 
{
    static HashMap<Integer, Student> student = new HashMap<>();
    static 
    {
        student.put(1, new Student(100, "Alex", "Male", "Berlin"));
        student.put(2, new Student(101, "Tony", "Male", "Maxico"));
        student.put(3, new Student(102, "Andrew", "Male", "Chicago"));
        student.put(4, new Student(103, "Alexa", "Female", "Brussels"));
        student.put(5, new Student(104, "Maria", "Female", "Houston"));
    }
    @Cacheable(cacheNames="demoCache", key="#id")public Student getStudentById(Integer id) 
    {
        System.out.println("Fetching student data from cache");
        return student.get(id);
    }
}

<config
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xmlns='http://www.ehcache.org/v3'
xmlns:jsr107='http://www.ehcache.org/v3/jsr107'>
<ehcache>
<diskStore path="java.io.tmpdir" />
<defaultCache maxElementsInMemory="2000" 
            eternal="true"
            overflowToDisk="false" 
            timeToLiveSeconds="1200" />
    <cache name="demoCache" 
            maxElementsInMemory="2000"
            eternal="false" 
            overflowToDisk="false" 
            timeToLiveSeconds="10000" />
</ehcache>
</config>

Getting Students from Cache
[id=100, name=Alex, gender=Male, city=Berlin]
[id=101, name=Tony, gender=Male, city=Mexico]
[id=102, name=Andrew, gender=Male, city=Chicago]
[id=103, name=Alexa, gender=Female, city=Brussels]
[id=104, name=Maria, gender=Female, city=Houston]