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Apex T. G. India Pvt. Ltd

Json with Java

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Json JSON is JavaScript Object Notation [ it's the damn default

definition  ], and was invented by Douglas Crockford. Actually

JSON is lightweight alternative

to XML,language and platform independent script.

Even JSON parsers & libraries are exists for

many programming languages.

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Json

Converting JSON text to something in JavaScript will takes

one line of code by using eval ( ) function  , to create an object

from JSON text, just pass the string to eval ( ) function after

surrounding the text with parentheses that’s it.

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JSON Object From JSON textJSON Object:

var names = "{"nameslist": ["java","php",“dotnet"]}";

The variable names will hold the JSON textWhole JSON text must be surrounded by quotes

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Variable (names) Into JS object Actually we can convert JSON text into  JavaScript object

with  eval function. eval() . eval function. eval() is the JavaScript function which

converts JSON text into an JavaScript object.

For Example:var jsObject = eval("(" + names + ")");

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Access JSON Object var arr_name = jsObject["nameslist"];

arr_name[0] will prints - java arr_name[1] will prints - php arr_name[2] will prints – dotnet Note: Index always start from zero

Instead of using eval() function It is safer to use a JSON parser to convert a JSON text to a JS object.

A JSON parser will recognize only JSON text and will not compile scripts.

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JSON text to JS Object JSON arrays are written inside square brackets Array can contain any number of objectsFor Example:

{"names": ['+'{"name" : “Shashi",  "address"  : “Patna",  "age"  : 26},'+'{"name" : “Kamlesh",  "address"  : “Delhi",  "age"  : 28}'+']}

Here names is an array containing 2 objects. By using JavaScript syntax we can access the values with the help of “.” operator, 

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JSON text to JS Object Example:

<script language="javascript" > 

var JsonObjecttext = {"names": ['+'{"name" : “Shashi",  "address"  : “Patna",  "age"  : 26},'+'{"name" : “Kamlesh",  "address"  : “Delhi",  "age"  : 28}'+']}

 var JsonObjectName = eval ("(" + JsonObjecttext + ")"); document.write("<font color='#148ee3' size='2' face='verdana'>Name - <font color='#000'>" +JsonObjectName.names[0].name+"</font></font> || ");document.write("<font color='#148ee3' size='2' face='verdana'>Age. - <font color='#000'>" +JsonObjectName.names[0].age+"</font></font> || ");document.write("<font color='#148ee3' size='2' face='verdana'>name - <font color='#000'>" +JsonObjectName.names[1].name+"</font></font> || ");document.write("<font color='#148ee3' size='2' face='verdana'>name - <font color='#000'>" +JsonObjectName.names[1].age+"</font></font>"); </script>

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Requirement to use Json in javaJars required:

json-lib-2.2.2-jdk15.jarezmorph.jarcommons-lang.jarcommons-logging.jarcommons-beanutils.jarcommons-collections.jar

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Json in javaimport net.sf.json.JSONObject;public class JsonEx {     public static void main(String args[])    {        JSONObject jo=new JSONObject();         jo.put(“company",“apex tgi");         jo.put(“address",“E-20,Sec-63,Noida");         jo.put(“state",”UP”);         System.out.println(jo);    } }

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