这里介绍Ehcache 2.X 缓存
添加基本的web项目 添加Ehcache 依赖
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.3.1.RELEASE
com.example
demo
0.0.1-SNAPSHOT
demo
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-cache
2.3.1.RELEASE
net.sf.ehcache
ehcache
2.10.6
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.junit.vintage
junit-vintage-engine
org.springframework.boot
spring-boot-maven-plugin
添加ehcache 配置缓存文件
在启动类上添加相关的注解
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@SpringBootApplication
@EnableCaching
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
创建实体类和BookService
创建实体类package com.example.demo;
import java.io.Serializable;
public class Book implements Serializable {
private Integer id;
private String name;
private String author;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}
package com.example.demo;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Repository;
@Repository
// 使用缓存的名称
@CacheConfig(cacheNames = "book_cache")
public class BookDao {
// 对该方法进行缓存
@Cacheable
public Book getBookById(Integer id){
System.out.println("调用Service方法");
Book book = new Book();
book.setAuthor("ming");
book.setId(id);
book.setName("ming");
return book;
}
@CachePut(key = "#book.id")
// 用在更新方法上，数据库数据更新，缓存数据也要更新，方法的返回值自动更新在已经保存的key上
public Book updateBookById(Book book){
System.out.println("更新ById");
book.setName("ming2");
return book;
}
@CacheEvict(key = "#id")
// 用在删除方法上，数据删除以后，其方法也会删除
public void deleteBookById(Integer id){
System.out.println("id删除");
}
}
创建测试类，对Service方法进行测试
package com.example.demo;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import static org.junit.jupiter.api.Assertions.*;
@ExtendWith(SpringExtension.class) //导入spring测试框架[2]
@SpringBootTest
//提供spring依赖注入
class BookDaoTest {
@Autowired
private BookDao bookDao;
@Test
public void test(){
bookDao.getBookById(1);
bookDao.getBookById(1);
bookDao.deleteBookById(1);
Book book = bookDao.getBookById(1);
System.out.println(book);
book.setName("mingming");
book.setAuthor("mingming");
book.setId(1);
bookDao.updateBookById(book);
Book book1 = bookDao.getBookById(1);
System.out.println(book1);
}
}
