配置缓存EhCache

说明

当前使用的缓存方式

配置方式

1、开启缓存配置

在启动类加入注解 @EnableCaching

@SpringBootApplication
@EnableCaching
public class EhcacheApplication {
    
    public static void main(String[] args) {
        SpringApplication.run(EhcacheApplication.class, args);
    }
}

2、引入jar包

        
        
            org.springframework.boot
            spring-boot-starter-cache
        
        
        
            net.sf.ehcache
            ehcache
        

3、添加配置

spring:
#  设置缓存类型和缓存配置文件
  cache:
    type: ehcache
    ehcache:
      config: classpath:/ehcache.xml

4、向 resources 中添加 ehcache 配置文件

ehcache.xml

5、添加测试实体类

/**
 * 测试实体类
 */
public class User {

    private String username;
    private String password;

    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;
    }
}

6、添加核心service类

import com.liucz.ehcache.model.User;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

@Service
public class UserService {

    @CachePut(value = "user", key = "#user.username")
    public User save(User user) {
        System.out.println("@CachePut，为username、key为:" + user.getUsername() + "的数据做了缓存");
        return user;
    }

    @CacheEvict(value = "user")
    public void remove(String username) {
        System.out.println("@CacheEvict，删除username、key为" + username + "的数据缓存");
        //这里不做实际删除操作
    }

    @Cacheable(value = "user", key = "#user.username")//3
    public User findOne(User user) {
        System.out.println("@Cacheable，为username、key为:" + user.getUsername() + "的数据做了缓存");
        return user;
    }

}

7、手动缓存测试

import javax.annotation.Resource;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserServiceTest {

    @Resource
    private CacheManager cacheManager;

    @Test
    public void cacheTest() {
        // 显示所有的Cache空间
        System.out.println(cacheManager.getCacheNames());

        Cache cache = cacheManager.getCache("user");
        cache.put("key", "123");
        System.out.println("缓存成功");
        String res = cache.get("key", String.class);
        System.out.println(res);
    }

}

8、自动缓存测试

import com.liucz.ehcache.model.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserServiceTest {

    @Resource
    private CacheManager cacheManager;
    @Autowired
    UserService userService;

    @Test
    public void save() {

        User user = new User();
        user.setUsername("username1");
        user.setPassword("password1");
        userService.save(user);

        Cache cache = cacheManager.getCache("user");
        User res = cache.get(user.getUsername(), User.class);
        System.out.println("查询缓存数据："+res.toString());

    }

    @Test
    public void remove() {

        User user = new User();
        user.setUsername("username2");
        user.setPassword("password2");
        userService.save(user);

        Cache cache = cacheManager.getCache("user");
        User res1 = cache.get(user.getUsername(), User.class);
        System.out.println("查询缓存数据1："+res1.toString());

        //执行删除操作
        userService.remove(user.getUsername());

        User res2 = cache.get(user.getUsername(), User.class);
        System.out.println("查询缓存数据2："+res2);

    }

    @Test
    public void findOne() {

        User user = new User();
        user.setUsername("username3");
        user.setPassword("password3");
        userService.findOne(user);

        Cache cache = cacheManager.getCache("user");
        User res = cache.get(user.getUsername(), User.class);
        System.out.println("查询缓存数据："+res.toString());

    }

}