shiro动态更新权限

转至 http://zgzty.blog.163.com/blog/static/83831226201361134047834/ 有删减

自定义一个shiroFilterFactoryBean

import java.util.Map;

import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.filter.mgt.DefaultFilterChainManager;
import org.apache.shiro.web.filter.mgt.PathMatchingFilterChainResolver;
import org.apache.shiro.web.servlet.AbstractShiroFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.aomaisoft.openfire.plugin.usionmrg.web.service.permission.PermissionService;

/**
 * 自定义shiro过滤器，初始化时从数据库读入url权限
 * 
 * @author 20005
 * @createDate 2014-7-23 上午09:38:26
 */
public class MyShiroFilterFactory extends ShiroFilterFactoryBean {
	private static ShiroFilterFactoryBean shiroFilterFactoryBean = null;
	private static Logger logger = LoggerFactory
			.getLogger(MyShiroFilterFactory.class);

	/**
	 * 初始化时加载filterChainDefinitions
	 */
	public MyShiroFilterFactory() {
		super();
		// 从数据库中读入URL权限列表
		setFilterChainDefinitions(new PermissionService().getAllPermissions());
		shiroFilterFactoryBean=this;
	}

	/**
	 * 重新加载数据库权限
	 * 
	 * @author 20005
	 * @createDate 2014-7-28 下午05:28:04
	 */
	public static void reloadChainDefinitions() {
		AbstractShiroFilter shiroFilter = null;
		try {
			shiroFilter = (AbstractShiroFilter) shiroFilterFactoryBean
					.getObject();
		} catch (Exception e) {
			logger.error("getShiroFilter from shiroFilterFactoryBean error!", e);
		}

		PathMatchingFilterChainResolver filterChainResolver = (PathMatchingFilterChainResolver) shiroFilter
				.getFilterChainResolver();
		DefaultFilterChainManager manager = (DefaultFilterChainManager) filterChainResolver
				.getFilterChainManager();

		// 清空老的权限控制
		manager.getFilterChains().clear();

		shiroFilterFactoryBean.getFilterChainDefinitionMap().clear();
		shiroFilterFactoryBean
				.setFilterChainDefinitions(new PermissionService()
						.getAllPermissions());
		// 重新构建生成
		Map<String, String> chains = shiroFilterFactoryBean
				.getFilterChainDefinitionMap();
		for (Map.Entry<String, String> entry : chains.entrySet()) {
			String url = entry.getKey();
			String chainDefinition = entry.getValue().trim().replace(" ", "");
			manager.createChain(url, chainDefinition);
		}
	}
}