The use of Java background JSON data

1. The list collection is converted into JSON code
List List = new ArrayList ();
List.add ("first");
List.add ("second");
Jsonarray jsonArray2 = jsonarray.fromobject (list);

2. Map collection into JSON code
Map map = new HashMap ();
Map.put ("name", "JSON");
Map.put ("bool", boolean.true);
Map.put ("int", new Integer (1));
Map.put ("arr", new string[] {"A", "B"});
Map.put ("func", "function (i) {return this.arr[i];}");
Jsonobject JSON = jsonobject.fromobject (map);

3. Bean converted to JSON code
Jsonobject jsonobject = jsonobject.fromobject (New Jsonbean ());

4. Convert arrays into JSON code
boolean[] Boolarray = new boolean[] {true, false, true};
Jsonarray jsonArray1 = Jsonarray.fromobject (Boolarray);

5. Conversion of general data into JSON code
Jsonarray jsonArray3 = Jsonarray.fromobject ("[' json ', ' is ', ' easy ']");

Add Json-lib package to your app ... Usage above
Jsonobject jsonobject = jsonobject.fromobject (message);
GetResponse (). Getwriter (). Write (jsonobject.tostring ());

When the data is converted to JSON, it is sent to the client using the method as above. The front end is ready to get JSON data. You can also use List List1 = new arraylist<listdate> () listdate ListDate2 = new Listdate ();
Listdate2.setid (Examsubject.getid ());
Listdate2.setvalue (Examsubject.getsubjectname ());     List1.add (LISTDATE2); Jsonarray jsonArray1 = Jsonarray.fromobject (List1); The foreground loop takes $.each (date, function (i, obj) {
$ ("#examName"). Append ("<option value=" + obj.id + ">" + obj.value+ "</option>");
});

The use of Java background JSON data