AJAX SERVLET ... ...

yangy608

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("    ");}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();}}}}