Im trying to pass an array from javascript to java servlet using Jackson, how this can be done..thanks
2 Answers
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'
});
5 Comments
Mohd_Q
thanks matthew for reply...im using YUI 3, the array reach servlet and everything is ok, but i need to get the right parameter from request. i replaced req.getReader() with req.getParameter("myArray") but still not working
Mohd_Q
nevermind...its worked i used req.getParameterValues("myArray"), thanks for helping
Matthew Flaschen
@Mohammed, if you're using
getParameterValues, you're probably not using JSON. You most likely have a regular GET query-string.Mohd_Q
i thought its worked...im using Jackson. so is there away to pick specific parameter from HttpServletRequest using ArrayNode rootNode = mapper.readValue(req.getReader(), ArrayNode.class); ??
Matthew Flaschen
Okay, it looks like you do need both
getParameterValues and Jackson because of the way YUI is sending the request.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.
answered Aug 8, 2010 at 8:37
Behrang Saeedzadeh
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1 Comment
Matthew Flaschen
Your client code sends the data in query-string format, not JSON.