shiro-重写标签功能----shiro：hasPermission 标签重写

public abstract class ShiroAuthorizingRealm extends AuthorizingRealm{

    private static final String OR_OPERATOR = " or ";  
    private static final String AND_OPERATOR = " and ";  
    private static final String NOT_OPERATOR = "not ";

    @Override
    public boolean isPermitted(PrincipalCollection principals, String permission) {
        /*理解问题：传递过来的字符串的格式：
            或者格式 ： 权限1 or 权限2
            与格式：      权限1 and 权限2
           非格式：       not 权限1 
          */
        
        //步骤：通过判断来实现三种操作符
        if (permission.contains(OR_OPERATOR)) {
            //如果有任何一个权限，返回true，否则返回false
            String[] permissions = permission.split(OR_OPERATOR);
            for (String p : permissions) {
                //只要有一个权限是通过验证的就返回true
                if (this.isPermittedWithNotOperator(principals, p)) {
                    return true;
                }
            }
            return false;
            
        }else if (permission.equals(AND_OPERATOR)) {
            //必须两个权限都有，返回true.否则返回false
            String[] permissions = permission.split(AND_OPERATOR);
            for (String p : permissions) {
                //只要有一个权限是false的，我们就返回假
                if (this.isPermittedWithNotOperator(principals, p)==false) {
                    return false;
                }
            }
            return true;
            
        }else {
            //如果没有关键字，按正常方式执行
            return this.isPermittedWithNotOperator(principals, permission);
        }
        

        
    }
    
    private boolean isPermittedWithNotOperator(PrincipalCollection principals, String permission) {  
        //判断权限字符串前缀是否有"not "关键字。
        if(permission.startsWith(NOT_OPERATOR)) {  
            //如果有，就返回相反的结构
            return !super.isPermitted(principals, permission.substring(NOT_OPERATOR.length()));  
        } else {  
            return super.isPermitted(principals, permission); 
           
        }  
    }  
}
<shiro:hasPermission name="modular:to_edit or modular:delete">

</shiro:hasPermission>