ShiroUtils通用工具包

import com.aaa.entity.User;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.Subject;

/**
 * Created by cws
 * @author cws
 */
public class ShiroUtils {

	public static Session getSession() {
		return SecurityUtils.getSubject().getSession();
	}

	/**获取shiro的连接器*/
	public static Subject getSubject() {
		return SecurityUtils.getSubject();
	}

	/**获取登录用户的信息*/
	public static User getUser() {
		return (User) SecurityUtils.getSubject().getPrincipal();
	}

	/**获取登录用户的id*/
	public static String getUserId() {
		return getUser().getId();
	}

	public static void setSessionAttribute(Object key, Object value) {
		getSession().setAttribute(key, value);
	}

	public static Object getSessionAttribute(Object key) {
		return getSession().getAttribute(key);
	}

	/**用于判断有没有获取登录用户的信息*/
	public static boolean isLogin() {
		return SecurityUtils.getSubject().getPrincipal() != null;
	}
	/**注销用户*/
	public static void logout() {
		SecurityUtils.getSubject().logout();
	}

	public static String getKaptcha(String key) {
		String kaptcha = getSessionAttribute(key).toString();
		getSession().removeAttribute(key);
		return kaptcha;
	}

}