求大神帮忙解决一下我ajax 传输不到后台servlet里面

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这是jsp界面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String id=request.getParameter("id");
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>系统项目信息修改</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">
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
$(
function(){
$.ajax({
type:"post",
url:"servlet/SysItemViewServlet",
data:"id=<%=id%>",
dataType:"json",
success:getItemInfo
});
}
);
function getItemInfo(data)
{
$("#idTd").append(data.id);
$("#itemCodeTxt").val(data.itemCode);
$("#itemValueTxt").val(data.itemValue);
$("#itemNameTxt").val(data.itemName);
$("#fidTxt").val(data.fid);
}
function doReturn()
{
window.location.href="http://localhost:8080/Project2_RestaurantSystem/page/sysitem/list.jsp";
}
function doSave()
{
var itemCode=$("#itemCodeTxt").val();
var itemValue=$("#itemValueTxt").val();
var itemName=$("#itemNameTxt").val();
var fid=$("#fidTxt").val();

var paramStr="id=<%=id%>&itemCode="+itemCode+"&itemName="+itemName+"&itemValue="+itemValue+"&fid="+fid;
alert('aaaaa');
$.ajax({
type:"post",
url:"servlet/SysItemEditServlet",
data:paramStr,
dataType:"json",
success:updateSuccess
});
alert('bbbbb');
}
function updateSuccess()
{
alert('ccccc');
}
</script> </head>
<h2 align="center" style="color:red">系统项目信息</h2>
<body>
<table border="1" align="center">
<tr><td width="150">ID</td><td width="150" id="idTd"></td></tr>
<tr><td>项目编号</td><td><input type="text" value="" id="itemCodeTxt" /></td></tr>
<tr><td>项目值</td><td><input type="text" value="" id="itemValueTxt" /></td></tr>
<tr><td>项目文本</td><td><input type="text" value="" id="itemNameTxt" /></td></tr>
<tr><td>父ID</td><td><input type="text" value="" id="fidTxt" /></td></tr>
<tr align="center">
<td colspan="2"><input type="button" value="保存" onclick="doSave()"/>      
<input type="button" value="返回" onclick="doReturn()"/></td>
</tr>
</table>
</body>

</html>

这是servelt

package com.project.servlet;

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

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

import net.sf.json.JSONArray;

import com.project.dao.SysItemDao;
import com.project.dao.impl.SysItemDaoImpl;
import com.project.entity.SysItem;

public class SysItemListServlet extends HttpServlet {
/**
* 该servlet用来查询sys_item的数据，并且以列表的形式展示，查询结果封装为json数据 2015年10月15日13:54:37
* @author xjt
*/
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String itemCode = request.getParameter("itemCode");
String itemName = request.getParameter("itemName");
// /itemCode如果为空，那么就应该查询出所有的itemCode
// /itemName为模糊查询，itemCode为精确查询
SysItemDao dao = new SysItemDaoImpl();
List<SysItem> list = dao.getListByCondition(itemCode, itemName);
JSONArray json = JSONArray.fromObject(list);

response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
out.print(json.toString());//此为data值
out.flush();
out.close();
}
}

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求大神帮忙解决一下 我ajax 传输不到后台servlet里面

求大神帮忙解决一下我ajax 传输不到后台servlet里面