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PORetrieving all the keys in a nested json in java
 

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    <p>This is the program i wrote:</p> <pre><code> /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package javaapplication1; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Map.Entry; import java.util.StringTokenizer; import net.sf.json.JSONException; import net.sf.json.JSONObject; /** * * @author 311001 */ public class NewClass { public static void main(String args[]) { JSONObject parentData = new JSONObject(); JSONObject childData = new JSONObject(); try { parentData.put("command", "login"); parentData.put("uid", "123123123"); childData.put("uid", "007"); childData.put("username", "sup"); childData.put("password", "bros"); parentData.put("params", childData); System.out.println(parentData); Map&lt;String, String&gt; map = new HashMap&lt;&gt;(); Iterator&lt;?&gt; iter = parentData.keys(); while (iter.hasNext()) { String key = (String) iter.next(); String value = parentData.getString(key); map.put(key, value); } for (Entry&lt;String, String&gt; entry : map.entrySet()) { System.out.println("key &gt; " + entry.getKey() + " : value = " + entry.getValue()); } String testData = map.get("params.uid"); System.out.println(testData); System.out.println("Tokenizing json"); String resultStr = parentData.toString(); System.out.println("String tokens "); StringTokenizer st = new StringTokenizer(resultStr); System.out.println(st.countTokens()); while (st.hasMoreTokens()) { System.out.println(st.nextToken()); } String testDat="abc :: result"; StringTokenizer simpleString = new StringTokenizer(testDat); System.out.println("Tokenizing simple string"); System.out.println(simpleString.countTokens()); while (simpleString.hasMoreTokens()) { System.out.println(simpleString.nextToken()); } } catch (JSONException e) { e.printStackTrace(); } } } </code></pre> <p>the output i got:</p> <pre><code>run: {"command":"login","uid":"123123123","params":{"uid":"007","username":"sup","password":"bros"}} key &gt; uid : value = 123123123 key &gt; command : value = login key &gt; params : value = {"uid":"007","username":"sup","password":"bros"} null Tokenizing json String tokens 1 {"command":"login","uid":"123123123","params":{"uid":"007","username":"sup","password":"bros"}} Tokenizing simple string 3 abc :: result BUILD SUCCESSFUL (total time: 0 seconds) </code></pre> <p>How can I recieve all the keys in my json object. In case I tokenize why do i get only one string token while for a simple string am getting the correct output 3 tokens.</p>
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    1. COcan you please explain why are you using map.get("params.uid") and not map.get("params").get("uid");
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    2. COthats a mistake ! I should be using map.get("params").get("uid").But what i need is a list of all the keys in my json.
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    3. CO@faizan In case i have a method which accepts a complex nested json object, how do i find all the keys in that jsob object ?
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