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Questions : 1 | What is The JSON(JavaScript Object Notation) ? |
Answers : 1 |
JavaScript Object Notation(JSON) is a lightweight text-based open standard designed for human-readable data interchange. It is derived from the JavaScript programming language for representing simple data structures and associative arrays, called objects. And JSON is language-independent, with parsers available for virtually every programming language. Uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python,php The JSON format is often used for serializing and transmitting structured data over a network connection. When third party data interchane(REST Services) then JSON may used there LIKE SHOP .It is primarily used to transmit data between a server and web application, serving as an alternative to XML. |
Questions : 2 | Who is the Father or creater of JSON ? |
Answers : 2 | Douglas Crockford called as the Father of JSON |
Questions : 3 | what the file extension of JSON |
Answers : 3 | The JSON filename extension is .json. |
Questions : 4 | Explain Json with php |
Answer : 4 |
Json is too much easy with php There is no installation needed to use these functions; they are part of the PHP core. nothing more need to know just only use { ,[ and create json format string and use three php function json_encode() to get JSON representation of a value, json_decode() for Decodes a JSON string, ¦json_last_error() to get the last error occurred in process.
write your desire string in below format and use php funtions : advertisements $string='{ "firstName": "Rohit", "lastName": "Singh", "age": 26, "address": { "streetAddress": "Mira Road Thane ", "city": "Mumbai", "state": "maharshtra", "postalCode": "401107" }, "phoneNumber": [ { "type": "home", "number": "022 333-1234" }, { "type": "fax", "number": "022 444-4567" } ] }'; $decodeString = json_decode($string); echo 'First Name - '.$decode->{"firstName"}; echo 'Last Name - '.$decode->{"lastName"}; echo 'Address - '.$decode->{"address"}->{"streetAddress"}; Out put : Print below First Name - Rohit Last Name - Singh Address - Mira Road Thane |
Questions : 5 | Why Use JSON over XML |
Answers : 5 |
Lighter and faster than XML as on-the-wire data
format JSON objects are typed while XML data is typeless > JSON types: string, number, array, boolean, > XML data are all string Native data form for JavaScript code > Data is readily accessible as JSON objects in your JavaScript code vs. XML data needed to be parsed and assigned to variables through tedious DOM APIs > Retrieving values is as easy as reading from an object property in your JavaScript code |
Questions : 6 | Explain JSON Structures |
Answers : 6 |
A collection of name/value pairs > In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array An ordered list of values > In most languages, this is realized as an array, vector, list, or sequence These are universal data structures supported A JSON object is an unordered set of name/value pairs A JSON object begins with { (left brace) and ends with } (right brace) Each name is followed by : (colon) and the name/value pairs are separated by , (comma) |
Questions : 7 | Compare JSON with JavaScript |
Answers : 7 |
JSON is a subset of the object literal notation of
JavaScript > JSON can be used in the JavaScript language with no muss or fuss Example: JSON Object var myJSONObject = {"bindings": [ {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"}, {"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"}, {"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"} ] }; In this example, a JSON JavaScript object is created containing a single member "bindings", which contains an array containing three objects, each containing "ircEvent", "method", and "regex" members Members can be retrieved using dot or subscript operators myJSONObject.bindings[0].method // "newURI" Text to Object Conversion in JavaScript code var myObject = eval('(' + myJSONtext + ')'); To convert a JSON text into an JSON object, use the eval() function > eval() invokes the JavaScript compiler > Since JSON is a proper subset of JavaScript, the compiler will correctly parse the text and produce an object structure |
Questions : 8 | what the Security and JSON Parser |
Answers : 8 |
Security and JSON Parser to understand by below examples // Include http://www.json.org/json.js var myObject = myJSONtext.parseJSON(); eval() can compile and execute any JavaScript program, so there can be security issues (cross-site scripting) > Use eval() when the source can be trusted When security is a concern - the source cannot be trusted -, it is better to use a JSON parser > A JSON parser will only recognize JSON text and so is much safer Object to Text Conversion var myJSONText = myObject.toJSONString(); You can convert JSON object into JSON text JSON does not support cyclic data structure > Do not give cyclical structures to the JSON stringifier |
Questions : 9 | Do you know JSON Tools for Java Developer |
Answers : 9 |
Ya some of JSON tool for java developer is Parser > Parse JSON text files and convert these to a Java model Renderer > Render a Java representation into text Serializer > Serialize plain POJO clusters to a JSON representation Validator > Validate the contents of a JSON file using a JSON schema JSONObject Java Class A JSONObject is an unordered collection of name/value pairs The put methods adds a name/value pair to an object The texts produced by the toString methods strictly conform to the JSON syntax rules myString = new JSONObject().put("JSON", "Hello, World!").toString(); // myString is {"JSON": "Hello, World"} |
Questions : 10 | How to Generate or Send JSON Data at the Server Side |
Answers : 10 |
Create JSONObject Java object Add name and value pairs using put method Convert it to String type using toString method and send it to the client with content-type as "text/xml" or "text/plain" myString = new JSONObject().put("JSON", "Hello, World!").toString(); // myString is {"JSON": "Hello, World"} |
Questions : 11 | How to Receive JSON Data at the Client Side |
Answers : 11 |
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; |
Questions : 12 | How to Generate/Send JSON Data at the Client Side |
Answers : 12 |
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); |
Questions : 13 | How to Receive JSON Data at the Server Side |
Answers : 13 |
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) { } |
Questions : 14 | What is JSON-RPC? What is JSON-RPC-Java? |
Answers : 14 |
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 |
Questions : 15 | Why JSON-RPC-Java? |
Answers : 15 |
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 |
Questions : 16 | Features of JSON-RPC-Java |
Answers : 16 |
Dynamically call server-side Java methods from JavaScript
DHTML web applications. No Page reloading. Asynchronous communications. Transparently maps Java objects to JavaScript objects. Lightweight protocol similar to XML-RPC although much faster. Leverages J2EE security model with session specific exporting of objects. Supports Internet Explorer, Mozilla, Firefox, Safari, Opera and Konqueror |