springboot 中应用缓存（二）

#springboot 中应用缓存（二）

项目中如果引用了shiro框架的话，缓存实例的引用需要增加@lazy标签或者采用手动注入Bean的方式

##Spring Boot默认的ConcurrentMapCacheManager

1. 添加缓存
2. application中开启**@EnableCaching**标注
3. 创建service层

   @Service
   public class CacheDemoService {
   
       @CachePut(value = "test", key = "#key")//将返回的数据写入缓存 
       public String getMessage(String msg, String key) {
           System.out.println("CachePut the message, key : " + key);
           return msg;
       }
   
       @Cacheable(value = "test", key = "#key")    //第一次执行方法缓存，第二次若参数相同时则不会触发方法，而是从缓存中直接返回数据
       public String getDemo(String key) {
           String msg = "hello world cache";
           System.out.println("Cacheable the message, key : " + key);
           return msg;
       }
   
       @CacheEvict(value = "test", key = "#key")
       public void deleteCache(String key) {
           System.out.println("delete the cache key : " + key);
       }
   }

##SpringBoot中使用其他缓存技术
###EhCache

<dependency> 
    <groupId>net.sf.ehcache</groupId> 
    <artifactId>ehcache</artifactId> 
</dependency>

Springboot 会自动配置EhCacheManager的Bean
###Guava

<dependency> 
    <groupId>com.google.guava</groupId> 
    <artifactId>guava</artifactId> 
    <version>18.0</version> 
</dependency>

###Redis

<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-redis</artifactId> 
</dependency>