Processing of Java JSON

Maven Dependency

<dependencies>        <dependency>    <groupId>com.alibaba</groupId>    <artifactid >fastjson</artifactId>    <version>1.2.5</version></dependency>    </ Dependencies>

Read JSON

classreadjson{ Public Static voidMain (string[] args) {String jsonstr= "{\" one\ ": \" one\ ", \" two\ ": [{\" two_1_1\ ": 2.11, \" two_1_2\ ": 2.12}, {\" two_2_1\ ": \" 2.21\ "}], \" three\ ": [\" Abc\ ", FALSE], \ "four\": {\ "four_1\": 4.1, \ "four_2\": 4.2}} "; //One : Simple Type//One: Object array (most complex)//three: Array type//Four : Object TypesJsongoogle (JSONSTR);    Jsonalibaba (JSONSTR); }    //gosn Read processing JSON     Public Static voidJsongoogle (String jsonstr) {jsonparser parser=NewJsonparser (); Jsonobject Jsonobj=(Jsonobject) parser.parse (JSONSTR); String One= Jsonobj.get ("One"). getasstring (); System.out.println (one);// OneJsonarray Twoobjarray= Jsonobj.get ("the"). Getasjsonarray (); System.out.println (Twoobjarray);//[{"Two_1_1": 2.11, "two_1_2": 2.12},{"two_2_1": "2.21"}]Jsonobject twoobj = (jsonobject) twoobjarray.get (0); String of= Twoobj.get ("Two_1_1"). Getasstring ();//can be treated as StringSystem.out.println (both);//2.11Jsonarray Threearray= Jsonobj.get ("three"). Getasjsonarray (); String Three_1= Threearray.get (0). getasstring (); Booleanthree_2 = Threearray.get (1). Getasboolean (); System.out.println (Three_1+ three_2);//AbcfalseJsonobject fourobj= Jsonobj.get ("Four"). Getasjsonobject (); Doublefour_1 = Fourobj.get ("four_1"). getasdouble (); System.out.println (four_1);//4.1    }    //Fastjson Read processing JSON     Public Static voidJsonalibaba (String jsonstr) {jsonobject jsonobj=Json.parseobject (JSONSTR); String One= Jsonobj.getstring ("One"); System.out.println (one);// OneJsonarray Twoobjarray= Jsonobj.getjsonarray ("the"); System.out.println (Twoobjarray);//[{"Two_1_1": 2.11, "two_1_2": 2.12},{"two_2_1": "2.21"}]Jsonobject twoobj = twoobjarray.getjsonobject (1); String two_2= Twoobj.getstring ("Two_2_1"); System.out.println (two_2);//2.21Jsonarray Threearray= Jsonobj.getjsonarray ("three"); String Three_1= threearray.getstring (0); Booleanthree_2 = Threearray.getboolean (1); System.out.println (Three_1+ three_2);//AbcfalseJsonobject fourobj= Jsonobj.getjsonobject ("Four"); String four_1= Fourobj.getstring ("four_1"); System.out.println (four_1);//4.1    }}

Write JSON

 Public class person{    private  String name;     Private int Age ;     Private Double salary;     Private Boolean Hasbaby;     Private List<string> babynames;     // setter/getter/tostring etc }

 Public classwritejson{ Public Static voidMain (string[] args) {writejsongoogle ();    Writejsonalibaba (); }    //Gson Writing JSON     Public Static voidWritejsongoogle () {jsonobject jsonobj=NewJsonobject (); Jsonobj.addproperty ("One", "Onestr"); Jsonobj.addproperty ("The Other",false); Jsonobject Threeobj=NewJsonobject (); Threeobj.addproperty ("Three", 3); Jsonobj.add ("Three", Threeobj); Jsonarray Jsonarray=NewJsonarray (); Jsonobject four_1=NewJsonobject (); Four_1.addproperty ("Four_1", 4.1); Jsonobject four_2=NewJsonobject (); Four_2.addproperty ("Four_2",true);        Jsonarray.add (four_1);        Jsonarray.add (four_2); Jsonobj.add ("Four", Jsonarray);        System.out.println (Jsonobj.tostring ()); //{"One": "Onestr", "one": false, "three": {"three": 3}, "four": [{"four_1": 4.1},{"four_2": True}]}    }    //Fastjson Writing JSON     Public Static voidWritejsonalibaba () {Map<string, object> jsonmap =NewTreemap<string, object>(); Jsonmap.put ("One", "Onestr"); Jsonmap.put ("The Other",false); Map<string, object> threeobj =NewHashmap<string, object>(); Threeobj.put ("Three_1", "3.1"); Threeobj.put ("Three_2", 3.2); Jsonmap.put ("Three", Threeobj); Jsonobject Jsonobj=NewJsonobject (JSONMAP); List<String> Babynames =NewArraylist<string>(); Babynames.add ("ABC"); Babynames.add ("Def"); Person Person=NewPerson ("Gusi", 12, 7000.00,true, Babynames); Jsonobj.put ("Four", person); Jsonobj.put ("Five", 5);        System.out.println (Jsonobj.tojsonstring ()); //{"Five": 5, "four": {"Age": "Babynames": ["abc", "Def"], "Hasbaby": True, "name": "Gusi", "Salary": 7000}, "one": " Onestr "," three ": {" Three_1 ":" 3.1 "," Three_2 ": 3.2}," both ": false}    }}

Common conversions for object types and JSON

 Public classDemoImplementsserializable{String name; intAge ; BooleanMan ;  PublicDemo () {Super(); }     PublicDemo (String name,intAgeBooleanMans) {        Super();  This. Name =name;  This. Age =Age ;  This. Man =Man ; }    //Setter/getter, must not forget, otherwise fastjson cannot set the value@Override PublicString toString () {return"Demo [name=" + name + ", age=" + Age + ", man=" + man + "]"; }}

//GsonDemo Demo1 =NewDemo ("A", 1,false); String Json1=NewGson (). ToJson (DEMO1);//JavaBean to StringSystem.out.println (json1);D emo demo2=NewGson (). Fromjson (Json1, Demo.class);//string to JavaBeanSystem.out.println (DEMO2); Jsonobject jsonObj1= (Jsonobject)NewJsonparser (). Parse (Json1);//string to JsonobjectSystem.out.println (JSONOBJ1); String Json2= Jsonobj1.tostring ();//Jsonobject to StringSystem.out.println (json2);//FastjsonDemo Demo3 =NewDemo ("B", 2,true); String Json3= Json.tojsonstring (DEMO3);//JavaBean to StringSystem.out.println (json3);D emo Demo4= Json.parseobject (Json3, Demo.class);//string to JavaBeanSystem.out.println (DEMO4); Jsonobject JsonObj2= Json.parseobject (Json3);//string to JsonobjectSystem.out.println (JSONOBJ2); String Json4= Jsonobj2.tojsonstring ();//Jsonobject to StringSystem.out.println (JSON4); Jsonobject jsonObj3= (jsonobject) Json.tojson (DEMO3);//JavaBean to JsonobjectSystem.out.println (JSONOBJ3);

Processing of Java JSON