常用公共工具类——Shiro工具类

public class ShiroUtils {

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

    public static Subject getSubject() {
        return SecurityUtils.getSubject();
    }

    public static SysUserEntity getUserEntity() {
        return (SysUserEntity)SecurityUtils.getSubject().getPrincipal();
    }

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

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

    public static boolean isLogin() {
        return SecurityUtils.getSubject().getPrincipal() != null;
    }

    public static String getKaptcha(String key) {
        Object kaptcha = getSessionAttribute(key);
        if(kaptcha == null){
            throw new RRException("验证码已失效");
        }
        getSession().removeAttribute(key);
        return kaptcha.toString();
    }

}