JSON Interview Questions and Answers
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Ques 11. How to receive JSON Data at the Client Side?
• JSON data is received as a string
• Calling eval() will generate JSON object in JavaScript code
var JSONdata = eval(req.responseText);
• Once you have JSON object, you can use . notation to access its properties
var name = JSONdata.name;
var address = JSONdata.addresses[3];
var streetname = JSONdata.addresses[3].street;
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Ques 12. How to Generate/Send JSON Data at the Client Side?
• Create JSON JavaScript object
• Use "POST" HTTP method in the open method of the XMLHttpRequest object
• Pass JSON JavaScript object in the send method of XMLHttpRequest object
var carAsJSON = JSON.stringify(car);
var url = "JSONExample?timeStamp=" + new Date().getTime(); createXMLHttpRequest();
xmlHttp.open("POST", url, true);
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlHttp.send(carAsJSON);
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Ques 13. How to receive JSON Data at the Server Side?
• Read the JSON data as a String type
• Create JSONObject Java object from the string String json = readJSONStringFromRequestBody(request);
//Use the JSON-Java binding library to create a JSON object in Java JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(json);
}
catch(ParseException pe) {
}
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Ques 14. What is JSON-RPC and JSON-RPC-Java?
• JSON-RPC is a simple remote procedure call protocol similar to XML-RPC although it uses the lightweight JSON format instead of XML
• JSON-RPC-Java is a Java implementation of the JSON-RPC protocol
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Ques 15. Why JSON-RPC-Java?
• It allows you to transparently call server-side Java code from JavaScript with an included lightweight JSON-RPC JavaScript client.
• It is designed to run in a Servlet container such as Tomcat and can be used with J2EE Application servers to allow calling of plain Java or EJB methods from within a JavaScript DHTML web application.
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