menutag.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 MenuTag 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' width='202' height='401' cellspacing='0' cellpadding='0' bgcolor='#FAF6EB'>");
			jspwriter.write("<tr><td align='center' width='202' height='76' background='image/left/menu_top.jpg'></td></tr>");			
			if(menulist==null||menulist.size()==0){
				jspwriter.write("<td align='center' background='image/left/none_back.jpg'>没有菜单显示！</td>");
				System.out.println("功能列表为空！");
			}
			else{
				jspwriter.write("<td align='center' valign='top'>");
				jspwriter.write("<table border='0' width='202' cellspacing='0' cellpadding='0'>");
				for(int i=0;i<menulist.size();i++){
					MenuSingle menusingle=(MenuSingle)menulist.get(i);
					jspwriter.write("<tr>");
					if(selectmenu.equals(menusingle.getMenuId())){
						jspwriter.write("<td valign='middle' height='30' style='text-indent:25' background='image/left/over.gif'><img src='"+menusingle.getMenuPic()+"' width='30' height='25'>&nbsp;&nbsp;<b><font color='black'>"+menusingle.getMenuName()+"</font></b></td></tr>");						
					}
					else{
						jspwriter.write("<td valign='middle' height='30' style='text-indent:25' background='image/left/out.gif' onMouseOver='this.background=\"image/left/over.gif\"' onMouseOut='this.background=\"image/left/out.gif\"'><img src='"+menusingle.getMenuPic()+"' width='30' height='25'>&nbsp;&nbsp;<a href='"+menusingle.getMenuDoOp()+"'>"+menusingle.getMenuName()+"</a></td></tr>");						
					}
					jspwriter.write("<tr height='1'><td background='image/left/space.jpg'></td></tr>");
				}
				jspwriter.write("</table></td>");
			}
			jspwriter.write("<tr><td align='center' height='47' background='image/left/menu_end_back.jpg'><a href='admin/exit'><img src='image/left/menu_end_b.jpg'></a></td></tr>");	
			jspwriter.write("</table>");
		} catch (IOException e) {
			e.printStackTrace();
		}		
		return SKIP_BODY;
	}
}