A brief introduction to the--json-lib of Json experience (II.)

This section focuses on using the Json-lib package to convert Java data types to JSON data types, that is, Java-->json.

First introduced Jsonserializer, which uses I simple clean interface way to convert any Java and JSON directly, Java-->json, using Jsonserializer.tojson (), Json-->java Use Tojava ().

 1  //  2  String s1 = new  String ("{1:1}"  3  string s2 = new  String ("[All]" ); 4  jsonobject json1 = (Jsonobject) Jsonserializer.tojson (S1);  5  System.out.println ("--Converts a string with Jsonserializer json--" + Json1);  6  jsonarray json2 = (Jsonarray) Jsonserializer.tojson (S2);  7  System.out.println ("--convert string Jsonserializer with jsonarray--" + json2); 

Show results

1 --convert string with Jsonserializer json--{"1": 1}2 --convert string with Jsonserializer jsonarray--[1,1]

Convert Java arrays and collections to JSON

1     //working with arrays and collections,—— >json2     Boolean[] Booleanarray =New Boolean[] {true,false,true };3Jsonarray Fromobject =Jsonarray.fromobject (booleanarray);4 System.out.println (fromobject);5 6List List =NewArrayList ();7List.add ("First");8List.add ("Second");9Jsonarray FromObject2 =jsonarray.fromobject (list);TenSystem.out.println (FROMOBJECT2);

Results

1 [true,false,true]2 ["First", "second"]

Convert beans and map to JSON

1      　　 //Working with Objects2         //From Beans & Maps ToJSON3Map map =NewHashMap ();4Map.put ("name", "JSON");5Map.put ("bool", boolean.true);6Map.put ("int",NewInteger (1));7Map.put ("Arr",NewString[] {"A", "B" });8Map.put ("func", "function (i) {return this.arr[i];}");9 TenJsonobject JsonObject2 =jsonobject.fromobject (map); OneSystem.out.println ("--map conversion json--\n" + jsonObject2);

Results

1 --map Conversion json-- 2 return this. Arr[i]; }, "bool":True}

The beans transformation first customizes the object Mybean,

1  Public classMybean {2 3     PrivateString name = "JSON";4     Private intPojoid = 1;5     Private Char[] options =New Char[] {' A ', ' F ' };6     PrivateString func1 = "function (i) {return this.options[i];}";7     PrivateJsonfunction Func2 =NewJsonfunction (NewString[] {"I" },8"Return this.options[i];");9      //Custom TypesTen     PrivateMyBean2 mybean2 =NewMyBean2 ("1", "Mybean"); One  A      PublicString GetName () { -         returnname; -     } the      Public voidsetName (String name) { -          This. Name =name; -     } -      Public intgetpojoid () { +         returnpojoid; -     } +      Public voidSetpojoid (intpojoid) { A          This. pojoid =pojoid; at     } -      Public Char[] getoptions () { -         returnoptions; -     } -      Public voidSetOptions (Char[] options) { -          This. options =options; in     } -      PublicString getFunc1 () { to         returnfunc1; +     } -      Public voidsetFunc1 (String func1) { the          This. func1 =func1; *     } $      Publicjsonfunction GetFunc2 () {Panax Notoginseng         returnFunc2; -     } the      Public voidSetFunc2 (jsonfunction func2) { +          This. Func2 =Func2; A     } the      PublicMyBean2 getMybean2 () { +         returnmybean2; -     } $      Public voidsetMybean2 (MyBean2 mybean2) { $          This. mybean2 =mybean2; -     } -}

The Mybean contains custom objects Mybean2

 Public classMyBean2 {PrivateString ID; PrivateString name;  PublicString getId () {returnID; }     Public voidsetId (String id) { This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicMyBean2 (string ID, string name) {Super();  This. ID =ID;  This. Name =name; }     PublicMyBean2 () {Super(); }}

Convert Beans to JSON

1 // The custom Mybean object contains the MyBean2 object, so bean-->json, whether or not a custom object, can convert the Json format 2         Jsonobject jsonObject3 = Jsonobject.fromobject (new  Mybean ()); 3         System.out.println ("--beans conversion json--\n" + jsonObject3); 　　　　

Results

1 --beans Conversion json-- 2 return  This return this. Options[i]; }, "Options": ["a", "F"]}

Summary: Convert Java objects to JSON, relatively simple, if beans or maps with jsonobject.fromobject (), if an array or collections, with Jsonarray.fromobject ().

A brief introduction to the--json-lib of Json experience (II.)