parse json faster in java

Question

I have the scenario. I will send a request to the web service, and get the XML response. Used XML class from json.lib to convert the XML to JSON. Time to get response from the web service is 7s, and parsing takes anywhere around 4-8 seconds. Then all i need to do is, parse the JSON to an much desired format.

Ex : JSON after convert the XML

{"Response":{"Response":{"type" : [{1,2,3}]},"value":[{100,200,300}]}}

I am converting this JSON to below format

[{"type":1,"value":100},{"type":2,"value":200},{"type":3,"value":300}]

The problem is, this particular conversion of JSON -> JSON takes hell-a-lot of time, so instead of display result within 15 secs, it's taking around 25 secs, and the worst part is, if JSON is bit big, it takes upto 90 secs. Can you tell me what should i do to make this fast?

I am using Spring 3.0 + Tomcat 6.0.29 + json.lib for JSON parsing.

Updated :

Code i am using to convert the XML to JSON.

JSONObject ResponseObj = XML.toJSONObject(elementToString.getelementToString((Element)Responses.item(0)));

Could you share an example of a JSON response? Spending 90 seconds of time parsing JSON seems like a lot of time unless the JSON itself is a bit odd. — Jeff Foster
– Jeff Foster, Commented Sep 4, 2012 at 14:56
Please provide us with the info/code how you are currently transforming the JSON, so we can give you hints if it's possible and where to improve your code. — Jan Gerlinger
– Jan Gerlinger, Commented Sep 4, 2012 at 14:57
I would get a better internet connection and/or a better pc. 90 secs are endless to parse.. — Enrichman
– Enrichman, Commented Sep 4, 2012 at 14:58
Can you please post your code for the json-to-json conversion? — Philipp
– Philipp, Commented Sep 4, 2012 at 14:59
why do json-to-json at all? why not xml-to-object and object-tojson using GSON ? — aishwarya
– aishwarya, Commented Sep 4, 2012 at 15:48

Karl-Bjørnar Øie · Accepted Answer · 2012-09-04 16:10:33Z

1

First, why json-to-json? Is it necessary or is it 'nice to have'?

I would think that the problem is object creation, first you create lots of objects by parsing the xml to DOM, then you must build a new object-tree for the xml->json conversion, and then again you create another object-tree for the json->json conversion. And object creation is one of the more expensive operations you can do in Java.

To prevent all the object creation, look at event driven xml and json handling like SAX for XML and Json Simple and/or Jackson for JSON.

But ofcourse the fastes possible solution would be to handle the XML SAX style and skip all the transformations.

edited Sep 4, 2012 at 16:10

answered Sep 4, 2012 at 15:51

Karl-Bjørnar Øie

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2 Comments

Rajkumar Over a year ago

My result is an SOAP Response, and i mapped it to an Object using JAXB. Will Jackson be of any help in that scenario?

Karl-Bjørnar Øie Over a year ago

If you are using JAXB take a look at Jersy's JSON features: jersey.java.net/nonav/documentation/latest/…

kodstark · Accepted Answer · 2012-09-04 15:31:25Z

0

You can test speed in json parser in xstream. Generally xstream uses pull parsing what is really fast in case of XML (pull parsing is the same idea like behind Java StAX - newer standard in Java after SAX and DOM).

When I used xstream, parsing from JSON to java object hasn't been noticable (RCP application with embedded browser).

answered Sep 4, 2012 at 15:31

kodstark

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Rajkumar Over a year ago

XStream again took the same time as json-lib. Not much of help

Rajkumar · Accepted Answer · 2016-01-25 08:20:07Z

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It's been more than a year old since I've posted this, but I felt I need to close this question with my solution, in case if someone faced exactly the same scenario!

So all I did was, parsed the JSON, and sent it as it is to the HTML page, in which I've done the parsing of data as I liked using lodash plugin! It was much faster and since conversion happened at front-end, we displayed data as and when it is parsed, like 5 after 5 and it felt fast. Hope it helps!

answered Jan 25, 2016 at 8:20

Rajkumar

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