如果有牛人，，，（虽然还不是我）
最近好几周都在搞一个动态菜单，利用了dtree控件，感觉问题出在$Ajax上边，求大神帮忙看看，很苦恼，搞不出来也很无语，不懂dtree的大神也可以帮我看看$Ajax这块是不是出了问题，个人感觉dtree这块不可能有错误
以下我详细列出我各个文件内容，劳烦各位
文件一
node类：
package com.dao;
public class Node {
private String nodeId;
private String parentId;
private String nodeName;
public String getNodeId() {
return nodeId;
}
public void setNodeId(String nodeId) {
this.nodeId = nodeId;
}
public String getParentId() {
return parentId;
}
public void setParentId(String parentId) {
this.parentId = parentId;
}
public String getNodeName() {
return nodeName;
}
public void setNodeName(String nodeName) {
this.nodeName = nodeName;
}
}
------------------------------------------------------
文件二
DaoTest类：
package com.dao;
import java.sql.*;
import java.util.*;
import com.dao.Node;
public class DaoTest {
private Connection conn = null;
public void initConnection() throws Exception {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost/tree","root","mysqladmin");
}
public ArrayList<Node> getNodeInfo() throws Exception{
ArrayList<Node> nodes = new ArrayList<Node>();
initConnection();
String sql = "select id,pid,name from t_tree";
Statement stat=conn.createStatement();
ResultSet rs = stat.executeQuery(sql);
while (rs.next()){
Node node = new Node();
//node.setHrefAddress(rs.getString("hrefAddress"));
node.setNodeId(rs.getString("id"));
node.setParentId(rs.getString("pid"));
node.setNodeName(rs.getString("name"));
nodes.add(node);
}
closeConnection();
return nodes;
}
public void closeConnection() throws Exception{
conn.close();
}
}
---------------------------------------------------------
文件三（servlet,得到数据库信息，并以XML形式输出）
package com.handler;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.DaoTest;
import com.dao.Node;
public class NodesPrint extends HttpServlet {
/**
* 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
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* 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 {
request.setCharacterEncoding("utf-8");
response.setContentType("text/xml;charset=utf-8");
PrintWriter out = response.getWriter();
DaoTest test = new DaoTest();
try{
ArrayList<Node> list=test.getNodeInfo();
if(list!=null&&list.size()>0){
out.println("<?xml version="1.0" encoding="UTF-8"?>");
out.println("<nodes>");
for(int i=0;i<list.size();i++){
Node node = list.get(i);
out.println("<node nodeId='"+node.getNodeId()+"' parentId='"+node.getParentId()+"'>"+node.getNodeName()+"</node>");
}
out.println("</nodes>");
}
}catch(Exception e){}
}
}
-----------------------------------------------------------------------------------------------------------------------------------
JSP调用Dtree控件，利用$ajax方法实现菜单--tree.jsp：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<!--
<title>My JSP 'tree.jsp' starting page</title>
-->
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<title>树形结构___ajax请求方式</title>
<script type="text/javascript" src="dtree.js"></script>
<script type="text/javascript" src="jQuery.js"></script>
<link rel="stylesheet" href="dtree.css" type="text/css"></link>
<script type="text/javascript">
tree = new dTree('tree');
$.ajax({
url:'NodesPrint',
type:'post', //数据发送方式
dataType:'xml', //接受数据格式
error:function(json){
alert( "not lived!");
},
async: false ,//同步方式
success: function(xml){
$(xml).find("node").each(function(){
var nodeId=$(this).attr("nodeId");
var parentId=$(this).attr("parentId");
var nodeName=$(this).text();
tree.add(nodeId,parentId,nodeName,"","","","","",false);
});
}
});
document.write(tree);
</script>
</head>
<body>
</body>
</html>
--------------------------------------------------------------------------------------------------------------------------
工程部署到web后显示 not lived!
[解决办法]
$.ajax({
url:'NodesPrint',
type:'post', //数据发送方式
dataType:'xml', //接受数据格式
error:function(json){
alert( "not lived!");
},
那就是ajax请求出错了。你看看报了什么错
[解决办法]
url:'NodesPrint',你这URL写的没问题吗？什么也不加就会调用到你的Servlet 里了？建议楼主先在Servlet 里打断点，看看AJAX到底调用到你的Servlet 里没，然后建议你去掉out.println("<?xml version="1.0" encoding="UTF-8"?>"); 这句话，有的时候解析XML格式文件的东西是不识别头的。
[解决办法]
writer.flush();
writer.close();
谢谢！
[解决办法]
碰到这种问题，就是debug起，打断点，一步步看
[解决办法]
该回复于2013-12-16 19:12:52被版主删除
[解决办法]
建议楼主用firefox firebug调试下，firebug可以看到你的ajax请求内容和返回内容是否正确。
