menmenutag.java

java web开发宝典源代码

package com.yxq.menu;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

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

public class menMenuTag extends TagSupport {

	public int doStartTag() throws JspException {
		HttpSession session=pageContext.getSession();
		String selectmenu=(String )session.getAttribute("selectmenu");
		if(selectmenu==null)
			selectmenu="";		
		List menulist=(ArrayList)session.getAttribute("menulist");
		JspWriter jspwriter=pageContext.getOut();
		
		try {
			jspwriter.write("<table border='0' height='21' cellspacing='0' cellpadding='0' style='margin-left:300'>");
			jspwriter.write("<tr>");
			if(menulist==null||menulist.size()==0){
				jspwriter.write("<td align='center'>没有菜单显示！</td>");
				System.out.println("功能列表为空！");
			}
			else{
				for(int i=0;i<menulist.size();i++){
					menMenuSingle menusingle=(menMenuSingle)menulist.get(i);
					if(selectmenu.equals(menusingle.getMenuId())){
						jspwriter.write("<td width='66' align='center'><b><font color='black'>"+menusingle.getMenuName()+"</font></b></td>");						
					}
					else{
						jspwriter.write("<td width='66' align='center'><a href='"+menusingle.getMenuAction()+"'>"+menusingle.getMenuName()+"</a></td>");						
					}
					if(i<menulist.size()-1){
						jspwriter.write("<td align='center' valign='middle'><img src='image/compart.gif'></td>");
					}
				}
			}
			jspwriter.write("</tr>");
			jspwriter.write("</table>");
		} catch (IOException e) {
			e.printStackTrace();
		}		
		return SKIP_BODY;
	}
}