CODEWITHSUNDEEP
javajqueryjsonservlets
Kebs
Kebs

Reputation: 29

How to fetch jQuery JSON request parameters in servlet?

I have the following javascript code:

var data = {message:"Hi"}

var sendJson = function (){
    alert(data);
    $.ajax({
        url:"./jsonTest",
        data: data,
        contentType:"application/json",
        type:"post",
        dataType:"json"
    }).success(function(reply) {
        alert("successful");
    });
}

How can I fetch the JSON object on my servlet?

I was previously trying to get it using

request.getParameter("data")

and trying to convert it to a JsonObject, but I kept getting null.

Upvotes: 1

Views: 9569

Answers (4)

Shrayas
Shrayas

Reputation: 7004

@Kebs,

If this isn't figured out yet .. You can find the answer here :)

Upvotes: 1

StaxMan
StaxMan

Reputation: 116620

You might want to check out JAX-RS containers (Jersey) which build on top of basic Servlet API, but make it much more convenient to get data binding for JSON.

But if you must use raw Servlet API, then POST contents will be available through request object; get the InputStream, and use a JSON library like Jackson to bind to object:

MyBean bean = new ObjectMapper().readValue(httpRequest.getInputStream(), MyBean.class);

and similarly if you need to return a JSON object, do the reverse:

objectMapper.writeValue(httpResponse.getOutputStream(), resultObject);

Upvotes: 0

Alenka
Alenka

Reputation: 31

In case data is object it will be transformed to request parameter string like

pameterName1=value1&pameterName2=value2

and you can get it by using

request.getParameter("pameterName1");

Upvotes: 0

joelbyler
joelbyler

Reputation: 125

try the line below. data is only the javascript variable but jquery will put the message member in the URL params instead of data.

request.getParameter("message");

Upvotes: 0

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