Jsonobject in Java

1. Introduction to jar packages

To run a program, the JSON-lib package must be introduced. The JSON-lib package depends on the following jar package:

1. commons-lang.jar

2. commons-beanutils.jar

3. commons-collections.jar

4. commons-logging.jar

5. ezmorph. Jar

6. json-lib-2.2.2-jdk15.jar

II,

Use jsonobject

JSON-
The LIB package is a bean, collections, maps, Java Arrays
Packages that are converted to XML and JSON. In this example, we will use the jsonobject class to create jsonobject objects, and then print the values of these objects. To use
Jsonobject. We will introduce the "net. SF. JSON" package. To add elements to an object, we need to use the put () method.

 

Java code

1. Import
   Net. SF. JSON. jsonarray;
   
2. Import
   Net. SF. JSON. jsonobject;
   
4. Public
    
   Class
   Jsonobjectsample {
   
6. // Create a jsonobject
   
   
7. Private
    
   Static
   Jsonobject createjsonobject (){
   
8. Jsonobject = new
   Jsonobject ();
   
9. Jsonobject. Put ("name"
   ,
   "Kevin"
   );
   
10. Jsonobject. Put ("Max. Score"
    ,
    New
    INTEGER (
    100
    ));
    
11. Jsonobject. Put ("Min. Score"
    ,
    New
    INTEGER (
    50
    ));
    
12. Jsonobject. Put ("nickname"
    ,
    "Picglet"
    );
    
13. Return
    Jsonobject;
    
14. }
15. Public
     
    Static
     
    Void
    Main (string [] ARGs ){
    
16. Jsonobject = jsonobjectsample. createjsonobject ();
17. // Output the jsonobject object
    
    
18. System. Out. println ("jsonobject =>"
    + Jsonobject );
    
20. // Interpret the type of the output object
    
    
21. Boolean
    Isarray = jsonobject. isarray ();
    
22. Boolean
    Isempty = jsonobject. isempty ();
    
23. Boolean
    Isnullobject = jsonobject. isnullobject ();
    
24. System. Out. println ("isarray :"
    + Isarray +
    "Isempty :"
    + Isempty +
    "Isnullobject :"
    + Isnullobject );
    
26. // Add attributes
    
    
27. Jsonobject. element ("Address"
    ,
    "Swap Lake"
    );
    
28. System. Out. println ("object after adding attribute =>"
    + Jsonobject );
    
30. // Return a jsonarray object
    
    
31. Jsonarray = new
    Jsonarray ();
    
32. Jsonarray. Add (0
    ,
    "This is a jsonarray value"
    );
    
33. Jsonarray. Add (1
    ,
    "Another jsonarray value"
    );
    
34. Jsonobject. element ("jsonarray"
    , Jsonarray );
    
35. Jsonarray array = jsonobject. getjsonarray ("jsonarray"
    );
    
36. System. Out. println ("A jsonarray object is returned :"
    + Array );
    
37. // Value after jsonarray is added
    
    
38. // {"Name": "Kevin", "Max. score ": 100," Min. score ": 50," nickname ":" picglet "," Address ":" swap Lake ",
    
    
39. // "Jsonarray": ["This Is A jsonarray value", "another jsonarray value"]}
    
    
40. System. Out. println (jsonobject );
42. // Returns a string based on the key.
    
    
43. String jsonstring = jsonobject. getstring ("name"
    );
    
44. System. Out. println ("jsonstring =>"
    + Jsonstring );
    
45. }
46. }

Import net. SF. JSON. jsonarray; import net. SF. JSON. jsonobject; public class jsonobjectsample {// create jsonobject object Private Static jsonobject createjsonobject () {jsonobject = new jsonobject (); jsonobject. put ("name", "Kevin"); jsonobject. put ("Max. score ", new INTEGER (100); jsonobject. put ("Min. score ", new INTEGER (50); jsonobject. put ("nickname", "picglet"); Return jsonobject;} public static void main (string [] ARGs) {jsonobject = jsonobjectsample. createjsonobject (); // output the jsonobject system. out. println ("jsonobject =>" + jsonobject); // specifies the type of the output object. boolean isarray = jsonobject. isarray (); Boolean isempty = jsonobject. isempty (); Boolean isnullobject = jsonobject. isnullobject (); system. out. println ("isarray:" + isarray + "isempty:" + isempty + "isnullobject:" + isnullobject); // Add the jsonobject attribute. element ("Address", "swap Lake"); system. out. println ("added object =>" + jsonobject); // return a jsonarray object jsonarray = new jsonarray (); jsonarray. add (0, "This is a jsonarray value"); jsonarray. add (1, "another jsonarray value"); jsonobject. element ("jsonarray", jsonarray); jsonarray array = jsonobject. getjsonarray ("jsonarray"); system. out. println ("return a jsonarray object:" + array); // value after jsonarray is added // {"name": "Kevin", "Max. score ": 100," Min. score ": 50," nickname ":" picglet "," Address ":" swap Lake ", //" jsonarray ": [" This Is A jsonarray value ", "Another jsonarray value"]} system. out. println (jsonobject); // returns a string jsonstring = jsonobject based on the key. getstring ("name"); system. out. println ("jsonstring =>" + jsonstring );}}

 

After getting the jsonobject object, we can use its method. You can view its API. I will provide an online API

 

Http://json-lib.sourceforge.net/apidocs/jdk15/index.html