Java TagSupport实现Web非权限验证标签

package com.sunfairs.tags;

import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

import com.sunfairs.constant.ShopConstants;

public class NoAuthorityTag extends TagSupport {
private String power;

public String getPower() {
return power;
}

public void setPower(String power) {
this.power = power;
}

@Override
public int doAfterBody() throws JspException {
return super.doAfterBody();
}

@Override
public int doEndTag() throws JspException {
return super.doEndTag();
}

@Override
public int doStartTag() throws JspException {
HttpSession session = pageContext.getSession();
String userPower = (String) session.getAttribute(ShopConstants.LOGIN_POWER);
if(power.indexOf(userPower) == -1||power.equals("*")){
return EVAL_PAGE;
}
return SKIP_BODY;
}
}