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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>
posted on 2010-08-18 14:05 HUIKK 阅读(192) 评论(0)  编辑  收藏 所属分类: Java

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