submenutag.java

java web开发宝典源代码

package com.yxq.menu;

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 SubMenuTag extends TagSupport {

	public int doStartTag() throws JspException {
		HttpSession session=pageContext.getSession();
		String selectsubmenu=(String)session.getAttribute("selectsubmenu");
		if(selectsubmenu==null)
			selectsubmenu="";		
		List submenulist=(ArrayList)session.getAttribute("submenulist");
		JspWriter jspwriter=pageContext.getOut();
		
		try{
			jspwriter.write("<table cellspacing='3' height='25' cellpadding='0'>");
			jspwriter.write("<tr>");
			if(submenulist!=null&&submenulist.size()!=0){
				for(int i=0;i<submenulist.size();i++){
					MenuSingle submenusingle=(MenuSingle)submenulist.get(i);
					jspwriter.write("<td background='image/submenu/submenu_b.jpg' width='77' height='25' align='center'>");
					if(selectsubmenu.equals(submenusingle.getMenuId())){
						jspwriter.write("<b><font color='black'><a href='"+submenusingle.getMenuDoOp()+"'>"+submenusingle.getMenuName()+"</a></font></b>");
					}
					else{
						jspwriter.write("<a href='"+submenusingle.getMenuDoOp()+"'>"+submenusingle.getMenuName()+"</a>");
					}
					jspwriter.write("</td>");
				}
			}
			else{
				jspwriter.write("<td align='center'>请选择管理功能！</td>");
			}
			jspwriter.write("<td width='8'></td>");
			jspwriter.write("</tr>");
			jspwriter.write("</table>");
		}catch(Exception e){
			System.out.println("SubMenuTag类中出错！");
			e.printStackTrace();
		}
		return SKIP_BODY;
	}
}