SpringBoot学习(十九)之使用 Caching- - EhCache

冷不防 2021-11-09 11:18 277阅读 0赞

我们来学习一下使用 Caching- - EhCache,我们根据Druid连接池以及SQL监控和spring监控项目改动一下, 复制springboot\_durid改为springboot\_ehcache

## 1.引入maven依赖 ##

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>
    <dependency>
        <groupId>net.sf.ehcache</groupId>
        <artifactId>ehcache</artifactId>
    </dependency>

## 2.配置application.properties ##

#echache缓存
    spring.cache.type=ehcache
    spring.cache.ehcache.config=classpath:config/ehcache.xml

## 3.配置config/ehcache.xml ##

## 4.启用@EnableCaching 注解支持 ##

@EnableCaching

## 5.编写控制器 ##

package com.cicoding.controller;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import com.cicoding.bean.User;
    import com.cicoding.service.CacheUserService;
    
    @Controller
    @RequestMapping(value="/user")
    public class UserController {
    
    	@Autowired
    	private CacheUserService userMapper;
    	
    	@ResponseBody
    	@RequestMapping(value="/get")
    	public User get() {
    		return userMapper.getOne(1);
    	}
    	
    	@ResponseBody
    	@RequestMapping(value="/list")
    	public List<User> list() {
    		return userMapper.list();
    	}
    }

## 6.编写服务接口和实现类 ##

package com.cicoding.service;
    
    import java.util.List;
    
    import com.cicoding.bean.User;
    
    public interface CacheUserService {
    	public User getOne(int id);
    
    	public List<User> list();
    }
    
    package com.cicoding.service.impl;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cache.annotation.CacheConfig;
    import org.springframework.cache.annotation.Cacheable;
    import org.springframework.stereotype.Service;
    
    import com.cicoding.bean.User;
    import com.cicoding.mapper.UserMapper;
    import com.cicoding.service.CacheUserService;
    
    @CacheConfig(cacheNames = "roncooCache")
    @Service
    public class CacheUserServiceImpl implements CacheUserService {
    
    	@Autowired
    	private UserMapper userMapper;
    
    	@Cacheable(key = "#p0")
    	@Override
    	public User getOne(int id) {
    		System.out.println("缓存不存在,读取数据库, id=" + id);
    		return userMapper.getOne(id);
    	}
    
    	@Override
    	public List<User> list() {
    		return userMapper.list();
    	}
    
    }

*  启动项目
 *  第一次访问，所以没有缓存，故发出一条sql语句查询。
 *   然后在访问“[http://localhost:8080/user/get][http_localhost_8080_user_get]” 结果如下：

![20190802220806723.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW9rZWppbjUyMQ_size_16_color_FFFFFF_t_70][]

再次刷新还是没有打印；说明在缓存读取的

![20190802220849870.png][]

结束。。。

[http_localhost_8080_user_get]: http://localhost:8080/user/get
[20190802220806723.png]: /images/20211109/968f192d95dd498f928044019b0b2e17.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW9rZWppbjUyMQ_size_16_color_FFFFFF_t_70]: /images/20211109/0f170668e3d647d2a3028bced4d5733a.png
[20190802220849870.png]: /images/20211109/d8a1e8b5eb284b27b6f68c97c21b1ad7.png