Passing array from javascript to java servlet using Jackson

Question

Hello Im trying to pass an array from javascript to java servlet using Jackson, how this can be done..thanks

Answer 1

For passing the array from the browser to the server side you don't need Jackson. You just need Ajax. For example, using jQuery you can do it this way:

$.ajax({
  url: 'your servlet url',
  data: yourArray
});

Then on the server side, you might want to deserialize the JSON into a JavaBean or, in your case, a java.util.List using Jackson. You can do that this way:

ObjectMapper mapper = new ObjectMapper();
List array = mapper.readValue(jsonText, List.class);

Where jsonText contains the String representation of yourArray that is sent to the server-side from the browser.

Answer 2

The basic idea should be straightforward:

Server:

doPost(HttpServletRequest req, HttpServletResponse resp)
{
  ObjectMapper mapper = new ObjectMapper();
  ArrayNode rootNode = mapper.readValue(req.getReader(), ArrayNode.class);
}

Client:

Using jQuery (you can also do it with other frameworks, or manually). Load a copy of json2.js to make sure you have JSON.stringify.

jQuery.ajax({
  type: 'POST',
  url: servletURL,
  data: JSON.stringify(jsArray),
  dataType: 'json',
  contentType: 'application/json'
});