缓存ecache使用

「爱情、让人受尽委屈。」 2022-10-27 05:13 117阅读 0赞

1、配置ecache.xml文件内容如下：

注释：<diskStore path="java.io.tmpdir"/>代表默认临时文件路径   user.home 代表用户主目录  user.dir 代表当前工作目录

<?xml version="1.0" encoding="UTF-8"?>
    <ehcache name="es">
        <diskStore path="java.io.tmpdir"/>
        
        
        <cache name="dictCache"
               maxEntriesLocalHeap="5000"
               eternal="true"
               overflowToDisk="false"
               statistics="true">
        </cache>
    
    </ehcache>

2、springmvc配置文件中添加如下配置：

<bean id="cacheManagerFactory"
              class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
            <property name="configLocation">
                <value>classpath:ehcache/ehcache.xml</value>
            </property>
        </bean>
    
        
        <bean  class="org.springframework.cache.ehcache.EhCacheCacheManager">
            <property name="cacheManager" ref="cacheManagerFactory"></property>
        </bean>

3、代码中通过注解的方式 将cacheManager注入进来使用。例如：

@Resource
        EhCacheCacheManager cacheManager;
         /**
         * 初始化数据字典缓存
         */
        public void initDictCatch(){
            Cache cache = cacheManager.getCache("dictCache");
            cache.clear();
            //排序规则
            List<Order> orders = new ArrayList<Order>();
            orders.add(Order.asc("dicType"));
            orders.add(Order.asc("dicKey"));
    //        List<Map<String, Object>> result = jdbcTemplate.queryForList("select * from sys_dic");
            List<DicBean> result = (List<DicBean>) hibernateTemplate.find("from DicBean order by dicType,dicKey");
    
    //        List<DicBean> result =  this.getDataList(DicBean.class,null,orders);
            //用于存放字典类型
            List<String> types = new ArrayList<String>();
            Map<String,Map<String,String>> map = new HashMap<String,Map<String,String>>();
            for(DicBean dic : result){
                String keyType = dic.getDicType();
                if(!types.contains(keyType)){
                    types.add(keyType);
                }
            }
    
            //封装cache
            for(int i=0;i<types.size();i++){
                Map<String,String> chilmap = new HashMap<String,String>();
                for(DicBean dic : result){
                    if(types.get(i).equalsIgnoreCase(dic.getDicType())){
                        chilmap.put(dic.getDicKey(),dic.getDicValue());
                    }
                }
                map.put(types.get(i),chilmap);
                cache.put(types.get(i),map);
            }
    
        }
         /**
         * 根据dictype获取字典项
         */
        public Map getItemsByType(String dictype){
            //获取字典项缓存
            Cache cache = cacheManager.getCache("dictCache");
            if(cache.get(dictype)==null){//说明缓存没有，则查询数据库 添加到缓存
                List<DicBean> result = (List<DicBean>) hibernateTemplate.find("from DicBean where dicType=? order by dicKey",new Object[]{dictype});
                Map<String,String> chilmap = new HashMap<String,String>();
                Map<String,Map<String,String>> prentmap = new HashMap<String,Map<String,String>>();
                for(DicBean dic : result){
                    chilmap.put(dic.getDicKey(),dic.getDicValue());
                }
                prentmap.put(dictype,chilmap);
                cache.put(dictype,prentmap);
                return chilmap;
            }
            Map map = (Map) cache.get(dictype).get();
            return (Map) map.get(dictype);
        }
    
    /**
    *清除缓存
    */
        public SuccessMsg clearCache(String name){
            //获取字典项缓存
            Cache cache = cacheManager.getCache(name);
            cache.clear();
            return  new SuccessMsg(true,"清除缓存成功!");
        }
    /**
    *缓存列表
    */
        public Collection<String>  getCacheNames(){
            Collection<String> cacheNames =cacheManager.getCacheNames();
            return cacheNames;
        }