Java JSON Example

It may not be the most convenient however it is flexible and can provides quite significant performance improvements to your particular application when necessary. If performance is not a factor in your application then the Google Gson api works just fine for the average android developer, Gson It is good for rapid development however also comes with a more a limited grantee and is not part of the new java 7 enterprise core. The stream Parser components in javax.json allow for some lightning fast parallel messaging processing capable of stripping out the components of a message you don’t need with out impacting your processing speed. you can trailer the parser to get what you need as fast as you can with out reading every thing. In systems that need to handle messages rates upwards of 10k p/s this is a must. I do agree the class mapping features of Gson are usefull however for strict java to java using json is not really the way to do serialization

- D

Nicely explained… really helpful to achieve the json response parsing.

- Ashutosh

i think you forgot os.close() in file writer after writing the json object. Please pardon me if i am wrong. Thank you for a wonderful explanation :-)

- Jayasimha

Hi Pankaj, I have a question on JSON parsing need your help over it.

- Varun

This solved my problem with converting InputStream to String because my JSON was huge and there was always OutOfMemory problem. Thank you so much!

- Djordje Nilovic

hi, I want to convert json object into java object . i am working with Spring MVC . I get Json object from Rest Controller. So the issue is that i want to convert json object to java object and transfer to controller. So all communication is happen throught RestController.

- swati

Fine example although it appears that it does not work with NetBeans. With code identical to the example and parsing a well-formed JSON file generated by NetBeans the code fails at runtime with: javax.json.stream.JsonParsingException: Unexpected char 60 at (line no=1, column no=1, offset=0).

- Philip Grove

Help me understand why this new JSON api is better than jaxb, ObjectMapper, or Jackson? In your example above, if I want to create a JSON string I do what you’ve shown above: jsonGenerator.write().write().write()…etc. etc. But this is just one notch better than doing String concatenation: String foo = “{” + “name:” + “John” + “,” … + “}”. This new api seems like a step backwards. Why can’t it create and parse JSON thru POJOs? What am I not seeing?

- David Jensen

Hi, in servlet doPost() method I wrote the following code: PrintWriter out=response.getWriter(); Object url=request.getAttribute(“authCode”); response.sendRedirect(“https://www.linkedin.com/uas/oauth2 /accessToken?grant_type=authorization_code&code=”+url+“&redirect_uri=https://localhost:8080/LinkedinMails/dem&client\_id=xxxxxxxxxxxx&client\_secret=xxxxxxxxxxxxxx”); i am getting output on browser as: {“access_token”:“AQVZ3XLxAkNZ7LowhdRP5TNoIx5svkCNmn10XQgwZb3I8tAC_JUTL44u43jJehYXtRmr2RwG9nNThkMrCVnbhqaZpJftdmK3MI1joYcHMQDozYfsWLy5FDs7POyNqK2WUuPNpJHUzHJflkPbQMMkpWAvNTeuza6PoDcb5otRN8jWqqxVE”,“expires_in”:5183999} how to retrieve value bases on access_token in servlet

- Raj

Thanks for this. One of the few JSON parsing examples around that is complex enough to be really useful.

- Joan