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I am building web application using jsp and servlet, I send ajax request from jsp and I want to return two json objects from servlet. I tried to do the following but the code did not work.

// in jquery I wrote this code

        var id = $(this).attr('id');

        var paramenters = {"param":id};

        $.getJSON("MyServlet", paramenters, function (data1,data2){

            $("h3#name").text(data1["name"]);

            $("span#level").text(data1["level"]);

            $("span#college").text(data2["college"]);

            $("span#department").text(data2["department"]);

        });

// in the servlet I wrote this code

    String json1 = new Gson().toJson(object1);

    String json2 = new Gson().toJson(object2);

    response.setContentType("application/json");

    response.setCharacterEncoding("utf-8");

    response.getWriter().write(json1);

    response.getWriter().write(json2);

can someone help me???

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4 Answers

up vote 11 down vote accepted

You should do it like this:

Server side:

String json1 = new Gson().toJson(object1); 
String json2 = new Gson().toJson(object2); 
response.setContentType("application/json"); 
response.setCharacterEncoding("utf-8"); 
String bothJson = "["+json1+","+json2+"]"; //Put both objects in an array of 2 elements
response.getWriter().write(bothJson);

Client side:

$.getJSON("MyServlet", paramenters, function (data){ 
   var data1=data[0], data2=data[1]; //We get both data1 and data2 from the array
   $("h3#name").text(data1["name"]); 
   $("span#level").text(data1["level"]); 
   $("span#college").text(data2["college"]); 
   $("span#department").text(data2["department"]);
});

Hope this helps. Cheers

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thank you very much – sasola May 7 '11 at 20:25
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up vote 2 down vote

Wrap them in JSON array:

[ {..}, {..}, {..}]

or, wrap them in another object:

{ "result1":{..}, "result2":{..} }
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up vote 1 down vote

You could return a JSON array with both objects as elements of the array. Have your servlet return JSON that has a structure like this one:

[{"name": "object1"}, {"name": "object2"}]

Then your javascript code can be something like this:

$.getJSON("MyServlet", paramenters, function (data){
        var data1 = data[0];
        var data2 = data[1];

        $("h3#name").text(data1["name"]);

        $("span#level").text(data1["level"]);

        $("span#college").text(data2["college"]);

        $("span#department").text(data2["department"]);

    });
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thaaaaaaaaaak you ,, – sasola May 7 '11 at 20:25
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up vote 1 down vote

you're going to need to put both into a single json string like so

response.getWriter().write("[");
response.getWriter().write(json1);
response.getWriter().write(",");
response.getWriter().write(json2);
response.getWriter().write("]");

this puts them in a json array

you could also put them in a json object

response.getWriter().write("{\"object1\":");
response.getWriter().write(json1);
response.getWriter().write(",\"object2\":");
response.getWriter().write(json2);
response.getWriter().write("}");
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