Accessing json string using java code

Question

I had following json format :

[
 { "Otype" : "win"},
 { "Otype" : "win"},
 { },
 { },
 { "Otype" : " win 7"},
 { "Otype" : " Linux"}
]

for accessing Otype I write java code as below:

while(cur.hasNext() && !isStopped()) {
    String json = cur.next().toString(); 
    JSONObject jObject = new JSONObject(json);
    System.out.print(jObject.getString("Otype"));
}//end of while

So above print statement print only following results:

win
win

but not print:

{ "Otype" : " win 7"}
{ "Otype" : " Linux"}

I think it may be first white space in value field that's why it not print above two key so I changed in print statement as below:

System.out.print(jObject.getString("Otype").trim());

but still not work :( .

How I can access all above json value using java code?

include the code u used to initialize the cur object as well.. — Naresh
– Naresh, Commented Apr 11, 2014 at 6:51
I guess, the empty objects ({ }) will cause a problem when you try to access the Otype field. Did the code throw an exception? — Henry
– Henry, Commented Apr 11, 2014 at 6:54
Hi by mistake I write wrong json format but now I changed json format — Neo-coder
– Neo-coder, Commented Apr 11, 2014 at 7:01

Michal Kordas · Accepted Answer · 2015-04-27 18:34:57Z

1

I found my solution. I changed my code as below:

while(cur.hasNext() && !isStopped()) {
String json = cur.next().toString(); 
JSONObject jObject = new JSONObject(json);
if(jObject.has("Otype")){
       System.out.print(jObject.getString("Otype"));
   }//end of if
}//end of while

edited Apr 27, 2015 at 18:34

Michal Kordas

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answered Apr 11, 2014 at 7:07

Neo-coder

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2 Comments

chris polzer Over a year ago

I am wondering how you get an iterator out of your given JSON String?

Neo-coder Over a year ago

Hi I read mongo data using java code so before while I was write my query and set cur as DBCursor so in while it iterates all my json data .

Balayesu Chilakalapudi · Accepted Answer · 2014-04-11 06:53:14Z

0

use toString() like this

System.out.print(jObject.toString());

answered Apr 11, 2014 at 6:53

Balayesu Chilakalapudi

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2 Comments

Neo-coder Over a year ago

If I print above then it shows me all json formatted string, I just wanted to access values of given key.

Balayesu Chilakalapudi Over a year ago

try this, System.out.print("{ \"Otype\" : \""+jObject.getString("Otype")+"\"}");

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