以静态的方法使用spring中的bean

最新推荐文章于 2023-09-01 15:10:21 发布

Nightliar

最新推荐文章于 2023-09-01 15:10:21 发布

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分类专栏：实例文章标签： spring

本文链接：https://blog.youkuaiyun.com/Nightliar/article/details/79884550

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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;
	}
	
}