Servlet can't get the xmlhttp post request

Question

hi! i'm new to xmlhttp..i am trying to make a widget that will show the gps info of the device and after that the gps info will be save to mysql..why i can't save the gps info to the database here is my code..
//function sending request to servlet
function callback1( result){
var latitude = result.ReturnValue.Latitude;
var longitude = result.ReturnValue.Longitude;
var req = null;
try {
req = new XMLHttpRequest();
if (typeof req.overrideMimeType != "undefined") {
req.overrideMimeType("text/xml");
req.onreadystatechange = function() {
if (req.readyState == 4) {
if (req.status == 200) {
} else {
alert("Error");
var url = "?d=""&latitude="+latitude"&longitude="+longitude;
req.open("POST","http://localhost:8080/GPS/location",true);
req.setRequestHeader("longitude",+longitude);
req.setRequestHeader("latitude",+latitude);
req.send();
} catch (ex) {
alert(ex);
location.java
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
String connectionURL="jdbc:mysql://localhost:3306/loc";
Connection connection;
try{
Enumeration headerNames=request.getHeaderNames();
while(headerNames.hasMoreElements()){
String headerName=(String)headerNames.nextElement();
String headerValue=request.getHeader(headerName);
pw.println(headerName);
pw.println(headerValue);
Class.forName("org.gjt.mm.mysql.Driver");
connection=DriverManager.getConnection(connectionURL,"root","1234");
PreparedStatement pst = connection.prepareStatement("insert into loc values(?,?)");
pst.setString(1,headerName);
pst.setString(2,headerValue);
int i = pst.executeUpdate();
if(i!=0){
pw.println("<br>Record has been inserted");
else{
pw.println("failed to insert the data");
catch (Exception e){
pw.println(e);
--i tried to run my java servlet and it can save already the default headername and value to my repository...                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

abcdefhhij wrote:
hi! i'm new to xmlhttp...Then stop right there. Don't write Javascript code which uses XMLHttpRequest, use one of the Javascript libraries (such as JQuery) which wrap it in a layer of code which deals with all of the horrendous issues with browser incompatibilities.
It's obvious to me that you have been reading old tutorials. Not only the one about XMLHttpRequest -- which as I said, nobody should be coding to these days -- but also the one about MySQL where it uses a class name for the MySQL JDBC driver which has been outdated for I would guess at least five years. Reading tutorials is an excellent idea, but at least try to find newer tutorials.