AJAX SERVLET ... ...

HTML:js

	  //查询二级节点
	  function getSonNote(noteId){ 
	  	//alert('test...');
	  	url="<%=request.getContextPath()%>/HomepageInitServlet?noteId="+noteId+"&flag=1";
		sendServer(); 
		return stateString;
	   }	
	  function sendServer() { 
		 if (window.ActiveXObject){ 
	                       req = new ActiveXObject("Microsoft.XMLHTTP"); 
	      	}else if(window.XMLHttpRequest){ 
	         	       req = new XMLHttpRequest(); 
	      	}
		   req.open("POST",url,false); 
		   req.onreadystatechange = getResponseText; 
		   req.send(null); 
	  }	
	  //ajax通用返回文本	  
	  function getResponseText(){ 	  	 
	     if (req.readyState == 4){ 
	       if (req.status == 200){ 
	           stateString = req.responseTEXT;  
	       } 
	     }          
	  }

 

JAVA:servlet

public class HomepageInitServlet extends HttpServlet implements Servlet {
	private static final String HOME_PAGEID_EN ="homepage_en";
	private static final String HOME_PAGEID_CN ="homepage_cn"; 
	
	public void init() throws ServletException {}
		public void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException
		{
			doPost(req, resp);
		}
		public void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException
		{	
			String resultValue = null ;
			int flag = Integer.parseInt(req.getParameter("flag"));
			if(flag==1){
				Map parameterMap = new HashMap();
				String id = req.getParameter("noteId");				
				try {
						IPageDelegate ip=new IPageDelegate();					
						List opList = ip.getNoteRelationByID(id);
						StringBuffer sb=new StringBuffer();
						
						if(null!=opList){
						
							sb.append("<SPAN id=\"checkbox").append(id).append("\">");
							for (int i = 0; i < opList.size(); i++) {
								PageVO pvo = new PageVO();
								pvo = (PageVO) opList.get(i);
								String nodeid=pvo.getTypeid();
								String treenode=pvo.getTreenode();
								String nodename=pvo.getTypename();								
								if(i==0){
									sb.append("<input name=\"typeId\" type=\"radio\" class=\"noBorder\" value=\"").append(treenode).append("\" checked>");
								}else{
									sb.append("<input name=\"typeId\" type=\"radio\" class=\"noBorder\" value=\"").append(treenode).append("\">");
								}								
								sb.append(nodename).append("&nbsp;&nbsp;&nbsp;&nbsp;");	
							}
							sb.append("</SPAN>");
							
							resp.getWriter().write(sb.toString());
							
						}else{
							sb.append("<SPAN id=\"checkbox").append(id).append("\">");
							sb.append("</SPAN>");
							resp.getWriter().write(sb.toString());
						}

				} catch (ApplicationException e) {
					e.printStackTrace();
				}			
			}
								
		}
}