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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String[] inputs = {
  13. 			"String Notify : {\"id\": \"1234\", \"transactionId\": \"TR-001\", \"timestamp\": \"1575445871\"} with result success",
  14. 			"String Notify : {\"id\": \"1234\", \"transaction\": { \"id\" : \"TR-002\" }, \"timestamp\": \"1575445871\"} with result success",
  15. 			"String Notify : {\"id\": \"1234\", \"transaction\": { \"id\" : \"TR-002\" }, \"timestamp\": \"1575445871\" which should fail"
  16. 		};
  17. 		for (String input : inputs) {
  18. 			System.out.println("Parsing " + input);
  19. 	    	System.out.println(extractJson(input));
  20. 		}
  21. 	}
  22.  
  23. 	public static String extractJson(String input) {
  24. 		int depth=0;
  25. 	    StringBuilder currentJsonString=new StringBuilder();
  26. 	    boolean containsValidJson = false;
  27. 	    for (char c: input.toCharArray()) {
  28. 	        if (c == '{') { depth++; }
  29. 	        else if (c == '}' && depth > 0) { // if depth==0, the } isn't part of a JSON object
  30. 	            depth--;
  31. 	            if (depth == 0) {
  32. 	                currentJsonString.append(c);
  33. 	                containsValidJson = true;
  34. 	                break;
  35. 	            }
  36. 	        }
  37. 	        if (depth > 0) { currentJsonString.append(c); }
  38. 	    }
  39. 	    if (containsValidJson) {
  40. 	    	return currentJsonString.toString();
  41. 	    } else {
  42. 	    	return null; // or better, throw exception
  43. 	    }
  44. 	}
  45. }
Success #stdin #stdout 0.1s 35980KB
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Standard input is empty
stdout
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Parsing String Notify : {"id": "1234", "transactionId": "TR-001", "timestamp": "1575445871"} with result success
{"id": "1234", "transactionId": "TR-001", "timestamp": "1575445871"}
Parsing String Notify : {"id": "1234", "transaction": { "id" : "TR-002" }, "timestamp": "1575445871"} with result success
{"id": "1234", "transaction": { "id" : "TR-002" }, "timestamp": "1575445871"}
Parsing String Notify : {"id": "1234", "transaction": { "id" : "TR-002" }, "timestamp": "1575445871" which should fail
null
https://ideone.com/4SWwEI
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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