再温jsp自定义标签

再温jsp自定义标签

java:

package  com.rwclp.usermanager.util;

import  java.io.IOException;

import  javax.servlet.http.HttpServletRequest;
import  javax.servlet.jsp.JspException;
import  javax.servlet.jsp.JspWriter;
import  javax.servlet.jsp.tagext.BodyContent;
import  javax.servlet.jsp.tagext.BodyTagSupport;

import  com.framework.commons.util.StrUtil;
import  com.rwclp.global.util.UserSessionDTO;

/** */ /**
 * <ul>
 * <li>Title:[UserRightTag]</li>
 * <li>Description: [用户权限JSP标签]</li>
 * <li>All right reserved.</li>
 * <li>Created by [Huyvanpull] [2010-8-18]</li>
 * <li>Midified by [修改人] [修改时间]</li>
 * </ul>
 * 
 * @version 1.0
 */
@SuppressWarnings( " serial " )
public   class  UserRightTag  extends  BodyTagSupport
{
    /** *//** 标签体内容 */
    private BodyContent bodyContent;
    
    /** *//** 权限名称 */
    private String name = "";
    
    public int doEndTag() throws JspException
    {
        // 获取JSPWriter对象
        JspWriter out = bodyContent.getEnclosingWriter();
        try
        {
            String content = bodyContent.getString();
            // 判断标签体是否有值和权限名是否有值
            if (StrUtil.noVal(content))
            {
                content = "标签体为空";
                out.write(content);
                return EVAL_PAGE;
            }
            
            // 判断权限名是否为空
            if (StrUtil.noVal(name))
            {
                content = "权限名为空";
                out.write(content);
                return EVAL_PAGE;
            }
            
            HttpServletRequest request = null;
            request = (HttpServletRequest) pageContext.getRequest();
            UserSessionDTO userSessionDTO = UserSessionDTO.get(request);
            
            // 判断用户是否登陆
            if (userSessionDTO == null)
            {
                content = "用户没有登陆";
                out.write(content);
                return EVAL_PAGE;
            }
            
            // 得到权限值
            if (userSessionDTO.getRightByName(name).equals("0"))
            {
                out.write(content);
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        return EVAL_PAGE;
    }
    
    public void setBodyContent(BodyContent bodyContent)
    {
        this.bodyContent = bodyContent;
    }
    
    public void setName(String name)
    {
        this.name = name;
    }
}

xml:

<? xml version="1.0" encoding="GBK" ?>
< taglib  xmlns ="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd"
    version ="2.0" >
     < tlib-version > 1.0 </ tlib-version >
     < short-name > mytaglib </ short-name >
     < uri > http://www.crazyit.org/mytaglib </ uri >
     < tag >
         < name > right </ name >
         < tag-class >  com.rwclp.usermanager.util.UserRightTag </ tag-class >
         < body-content > JSP </ body-content >
         < attribute >   
             < name > name </ name >   
             < required > true </ required >   
             < rtexprvalue > true </ rtexprvalue >   
         </ attribute >   
     </ tag >
</ taglib >

jsp:

<% @taglib uri="/WEB-INF/myTag.tld" prefix="myTag"  %>
< myTag:right  name ="addUserRight" >
是否可能显示
</ myTag:right >