Java中的JSON字符串到JSON

Question

I have a couple of txt files that gets some information from android's (call,messages,etc) database and stores it as a Cursor object.

I then convert the Cursor onto a JSON object which is then stored on a txt file on an SD card on the device. When I read from the file I get lines as a String like this one:

{"date":1332969098495,"duration":0,"number":"7038673588","Device_ID":"streak"}

I have to store the values of the String onto a MySQL table. Is there a way that I can convert this back onto a JSON or maybe a Map?

I thought about editing the String so the values are surrounded by a single quote and use the MySQL syntax to simply load the fields on the file.

Thanks!

Answer 1

You need to use JSon-lib (or) GSon libraries for this purpose.

Example GSon code would be:

YourObject obj = gson.fromJson(inputJson, YourObject.class);

Note: YourObject is java class with getter/setter.

Answer 2

You can create a JSONObject from the string that you have. That will pretty much give the same functionality as that of java.util.Map. For eg,

String jsonStr = "json representation of your data";
JSONObject jObj = new JSONObject(jsonStr);
jObj.get(yourKeyString);
//do more with your jObj here...

Hope this helps. Refer the JSONObject documentation for more details.

Answer 3

Here is an tutorial of using GSON library to achieve typed object conversion.

http://java.sg/parsing-a-json-string-into-an-object-with-gson-easily/

Answer 4

Sathishpaul is correct but just to clarify :

JSONObject obj =  new JSONObject(YourJSONString);
Long date = obj.getLong("date");
int duration = obj.getInt("duration");

etc..