How do you return a JSON object from a Java Servlet

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How do you return a JSON object form a Java servlet.

Previously when doing AJAX with a servlet I have returned a string. Is there a JSON object type that needs to be used, or do you just return a String that looks like a JSON object e.g.

String objectToReturn = "{ key1: 'value1', key2: 'value2' }";

I do exactly what you suggest (return a String).

You might consider setting the MIME type to indicate you're returning JSON, though (according to this other stackoverflow post it's "application/json").

Returning a JSON Response from a Servlet, getWriter(); // Assuming your json object is **jsonObject**, perform the following, it will return your json object out.print(jsonObject); out.flush();. response.setContentType("application/json"); // Get the printwriter object from response to write the required json object to the output stream PrintWriter out = response.getWriter(); // Assuming your json object is **jsonObject**, perform the following, it will return your json object out.print(jsonObject); out.flush();

Write the JSON object to the response object's output stream.

You should also set the content type as follows, which will specify what you are returning:

response.setContentType("application/json");
// Get the printwriter object from response to write the required json object to the output stream      
PrintWriter out = response.getWriter();
// Assuming your json object is **jsonObject**, perform the following, it will return your json object  
out.print(jsonObject);
out.flush();

How can we return a JSON object from a Java Servlet?, Java servlet JSON tutorial shows how to return JSON data from a Java library to serialize and deserialize Java objects to (and from) JSON. How do you return a JSON object form a Java servlet. Previously when doing AJAX with a servlet I have returned a string. Is there a JSON object type that needs to be used, or do you just return a String that looks like a JSON object e.g.

Java servlet JSON tutorial - serving JSON from Java servlet, Creating Servlet and Return JSON Response - UserServlet.java. A quick sample for converting an object to JSON representation with Gson would be: String  Comment retourner un objet JSON d'un servlet Java. précédemment en faisant AJAX avec un servlet j'ai retourné une chaîne. Est-ce qu'il y a un type d'objet JSON qui doit être utilisé, ou est-ce que vous retournez juste une chaîne qui ressemble à un objet JSON par exemple . String objectToReturn = "{ key1: 'value1', key2: 'value2' }";

How do you return a JSON object from a Java Servlet

response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();

  //create Json Object
  JsonObject json = new JsonObject();

    // put some value pairs into the JSON object .
    json.addProperty("Mobile", 9999988888);
    json.addProperty("Name", "ManojSarnaik");

    // finally output the json string       
    out.print(json.toString());

How to Return a JSON Response from a Java Servlet, Return JSON Servlet - If you want to return back data in JSON format from servlet class please follow steps below using jsp Apache Tomcatis an open source Java Servlet Container developed by the Apache Software Foundation (ASF). It is the most popular Java web server. Gsonis an open source Java library to serialize and deserialize Java objects to (and from) JSON. Java Servlet.

Just write a string to the output stream. You might set the MIME-type to text/javascript (edit: application/json is apparently officialer) if you're feeling helpful. (There's a small but nonzero chance that it'll keep something from messing it up someday, and it's a good practice.)

Return JSON Servlet - How to return JSON data from , The only important thing to keep in mind while returning a JSON object from a Java servlet is to specify the correct MIME type for JSON. In the previous section of JSON-Java example you have learned how to create a java class by using JSON classes. Now in this example we will tell you how to use JSON classes for creating Servlet. In this example we have created an object of JSONArray and then we have added elements into this array by using the method add(). To have functionality

Returning a JSON object from a Java Servlet, jQuery autocomplete example using Java Servlet Ajax request and JSON with Java Servlet using JSON We'll create a JSONObject from the static JSON data java script alert message: Return JSON Servlet Getting Json data from servlet to  you send the data as normal POST parameters (not Stringnyfied) and you tell your servlet that this is a JSON string (Which is not!!!) So to actually get this to work you have to either Stringnify the data you send to the servlet or to remove the contentType: "application/json" and 'dataType:'json' so you can treat the data as normal POST data.

Java Servlet JSON Example Tutorial, In this spring rest json example, we will learn to write RESTFul webservices capable of returning JSON for resources using MappingJackson2JsonView. Equivalent XML configuration to above java configuration is as below. bean name = "jsonTemplate" class = "org.springframework.web.servlet.view.json. Tag: java,json,spring,hibernate I am trying to get an object from my database using Spring REST API. The problem is that I am not receiving the content correctly.

How to get json data from servlet to jsp, Before you start with encoding and decoding JSON using Java, you need to install any of the JSON modules available. For this tutorial we have downloaded and installed JSON.simple and have added the location of json-simple-1.1.1.jar file to the environment variable CLASSPATH. Mapping between JSON and Java entities.

Comments
  • Nitpick; shouldn't you want more like { key1: value1, key2: value2 }?
  • Nitpick: what he really wants is { "key1": "value1", "key2": "value2" }... :-)
  • @Ankur checkout the link if you decided to use Spring 3.2.0.
  • Nitpick: we shouldn't assume the values are Strings, so what he really wants is { "key1": value1, "key2": value2 }
  • These Nitpicks (esp. in this order), are epic :)
  • This helped me. As mentioned in Mark Elliot answer, jsonObject could be just a string formatted as a json. Remember to use double quotes, as single quotes won't give you a valid json. Ex.: String jsonStr = "{\"my_key\": \"my_value\"}";
  • It will be good to use response.setCharacterEncoding("utf-8"); too
  • I'm doing this to send response to javascript and displaying the response in alert. why is it displaying the html code inside the alert..why am i getting the html code as response. i did the exact same thing like you said.
  • I have the same issue as @iLive
  • Depending on version, JsonObject is abstract. I created an answer to a newer implementation.
  • Incorrect. There is usually no reason to add overhead of constructing a String -- output should go straight to OutputStream. Or, if intermediate form is needed for some reason, can use byte[]. Most Java JSON libraries can write directly to OutputStream.
  • do I need to use getBytes("UTF-8")) or can I just return the String variable?
  • It's a safe programming practice to use UTF-8 for encoding the response of a web application.