1.spring缓存注解，可以丢在controller，也可以丢在service，也可以丢在mapper。

2.手动操作缓存使用：

    @Autowiredprivate CacheManager cacheManager;

3.添加缓存

//添加缓存
@Override
@Cacheable(cacheNames = "test", key = "'test_model' + #id",unless="#result == null") //如果结果为空，不缓存
public TestModel selectByIdCache(Long id) {return baseMapper.selectById(id);
}
//等于代码：
@Override
public TestModel selectByIdCache(Long id) {TestModel model baseMapper.selectById(id);if(model!=null){//如果结果为空，不缓存Cache cache = cacheManager.getCache("test");cache.put("test_model"+id,model);}return model;
}

4.删除缓存

//注解删除缓存
@CacheEvict(cacheNames = "test", key = "'test_model' + #bo.id")
@Override
public Boolean updateByBo(TestModelBo bo) {
}
//等于代码：
@Override
public Boolean updateByBo(TestModelBo bo) {Cache cache = cacheManager.getCache("test");cache.evict("test_model"+bo.getId());
}

5.清空缓存

//注解清空缓存
@CacheEvict(cacheNames = "test", allEntries = true)
@Override
public Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid) {
}
//等于代码：
@Override
public Boolean deleteWithValidByIds(Collection<Long> ids, Boolean isValid) {Cache cache = cacheManager.getCache("test");cache.clear();
}