以静态的方法使用spring中的bean

约定不等于承诺〃 2022-05-27 03:17 87阅读 0赞

1.SpringContextHolder.java

package com.Nightliar.business.common.utils;
    
    import com.Nightliar.business.entity.SysMenu;
    import com.Nightliar.business.enums.CacheType;
    import com.Nightliar.business.service.ISysMenuService;
    import com.Nightliar.business.shiro.ShiroUser;
    import com.Nightliar.business.utils.BackendLoginUtil;
    import com.Nightliar.business.utils.Constant;
    import com.baomidou.mybatisplus.mapper.EntityWrapper;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    import java.util.List;
    
    /**
     *
     * Created by Nightliar
     * 2018-03-25 20:59
     *
     */
    
    @Component
    public class UserUtils {
    
        @Autowired
        private static ISysMenuService menuService = SpringContextHolder.getBean(ISysMenuService.class);
    
        /**
         * 得到当前用户权限下的所有资源
         */
        @SuppressWarnings("unchecked")
        public static List<SysMenu> getMyListMenu(){
            ShiroUser shiroUser = BackendLoginUtil.getUser();
            List<SysMenu> menuList = (List<SysMenu>)CacheUtils.get(CacheType.CACHE_SYSCACHE.getCode(), Constant.SYSCACHE_USER_INDEXMENU + shiroUser.getId());
            if (menuList == null){
                EntityWrapper<SysMenu> wrapper = new EntityWrapper<>();
                wrapper.orderBy("sort");
                wrapper.in("id", shiroUser.getMenuIds());
                menuList = menuService.selectList(wrapper);
                CacheUtils.put(CacheType.CACHE_SYSCACHE.getCode(), Constant.SYSCACHE_USER_INDEXMENU + shiroUser.getId(), menuList);
            }
            return menuList;
        }
    
    }

2.CacheUtils.java（实例）

package com.Nightliar.business.common.utils;
    
    import com.Nightliar.business.enums.CacheType;
    import net.sf.ehcache.Cache;
    import net.sf.ehcache.CacheManager;
    import net.sf.ehcache.Element;
    
    import java.util.List;
    
    /**
      *
     * Created by Nightliar
     * 2018-3-29 21:50
     *
     */
    public class CacheUtils {
    	
    	private static CacheManager cacheManager = (CacheManager)SpringContextHolder.getBean("ehcacheManager");
    
    	//默认为系统缓存
    	private static final String SYS_CACHE = CacheType.CACHE_SYSCACHE.getCode();
    
    	/**
    	 * 获取SYS_CACHE缓存
    	 * @param key
    	 */
    	public static Object get(String key) {
    		return get(SYS_CACHE, key);
    	}
    
        /**
         * 获取缓存
         * @param cacheName
         * @param key
         */
        public static Object get(String cacheName, String key) {
            Element element = getCache(cacheName).get(key);
            return element==null?null:element.getObjectValue();
        }
    	
    	/**
    	 * 写入SYS_CACHE缓存
    	 * @param key
    	 * @return
    	 */
    	public static void put(String key, Object value) {
    		put(SYS_CACHE, key, value);
    	}
    
        /**
         * 写入缓存
         * @param cacheName
         * @param key
         * @param value
         */
        public static void put(String cacheName, String key, Object value) {
            Element element = new Element(key, value);
            getCache(cacheName).put(element);
        }
    	
    	/**
    	 * 从SYS_CACHE缓存中移除
    	 * @param key
    	 * @return
    	 */
    	public static void remove(String key) {
    		remove(SYS_CACHE, key);
    	}
    	
    	/**
    	 * 从缓存中移除
    	 * @param cacheName
    	 * @param key
    	 */
    	public static void remove(String cacheName, String key) {
    		getCache(cacheName).remove(key);
    	}
    
        /**
         * 从缓存中删除某一类型的缓存
         * @param cacheName
         */
    	public static void removeCache(String cacheName){
    	    getCache(cacheName).removeAll();
        }
    	
    	/**
    	 * 获得一个Cache，没有则创建一个。
    	 * @param cacheName
    	 * @return
    	 */
    	public static Cache getCache(String cacheName){
    		Cache cache = cacheManager.getCache(cacheName);
    		if (cache == null){
    			cacheManager.addCache(cacheName);
    			cache = cacheManager.getCache(cacheName);
    			cache.getCacheConfiguration().setEternal(true);
    		}
    		return cache;
    	}
    
    	public static CacheManager getCacheManager() {
    		return cacheManager;
    	}
    	
    }