I want to send an array of arrays to a java servlet via ajax, receive that data and go through it.
Ex:
var datos=[[1,2,3],[4,5,6],[7,8,9]];
$.ajax({
url: servlet,
dataType: 'json',
type: 'post',
data: { lista: datos },
success:function(){}
});
Send that by ajax to a servlet. How do I receive it and go through it in java?
You are using datatype json , so jQuery will send your parameters as body of the request, not as the classic multipart/form-data so you can not receive them with getParameters , you have to read the body of the request , and that will return a json as a string, then you can pass it to some parser of json and get the data of your arrangement.
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
StringBuffer jb = new StringBuffer();
String line = null;
try {
BufferedReader reader = request.getReader();
while ((line = reader.readLine()) != null)
jb.append(line);
} catch (Exception e) { /*Error leyendo los datos, ejm. conexión interrumpida, etc. */}
try {
// jb.toString(); // el json como cadena
JSONObject objetoJson = HTTP.toJSONObject(jb.toString());
} catch (JSONException e) {
// error formateando el json
throw new IOException("Error convirtiendo el Json");
}
JSONArray arr = objetoJson.getJSONArray("lista"); // obteniendo tu lista
}