categoryservlet.java

树形菜单

package com.sdjs.tree.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sdjs.tree.pojo.Chapter;
import com.sdjs.tree.service.CategoryService;


public class CategoryServlet extends HttpServlet
{

	/**
	 * Constructor of the object.
	 */
	public CategoryServlet()
	{
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy()
	{
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{

		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();
		String sid = request.getParameter("id");
		String root=request.getParameter("root");
		int id = Integer.parseInt(sid);
		CategoryService cs = new CategoryService();
		
		
		List cpList=null;
		if(root!=null)
		{
			cpList = cs.getRootChapters(id);
		}
		else
		{
			cpList = cs.getChaptersByParentid(id);
		}
		if(cpList!=null && !cpList.isEmpty())
		{
			Iterator itr = cpList.iterator();
			while(itr.hasNext())
			{
				Chapter cp = (Chapter)itr.next();
				
				if(cp.isIsendnode())
				{
					out.print("<li id=\""+cp.getChapterid()+"\"><img src=\"images/tree/sheet.gif\"><a href=\"#\" >"+cp.getChaptername()+"</a></li>");
				}
				else
				{
					out.print("<li id=\""+cp.getChapterid()+"\"><img src=\"images/tree/plus.gif\" onClick=\"showHide(\'"+cp.getChapterid()+"\')\"/><img src=images/tree/folder.gif><a href=\"javascript:showHide(\'"+cp.getChapterid()+"\')\">"+cp.getChaptername()+"</a><ul style=\"display:none;\"></ul></li>");
				}
			}
		}
		
		
		
		
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException
	{

		this.doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException
	{
		// Put your code here
	}

}