ajax树形菜单 动态显示

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 } }