java-generating JSON data in any format

A recent study of Java stuff. Previously, by their own groping, the implementation of the Java object into the JSON format of the data, the ability to return to the front end. The Jsonobject.fromobject (object) method was used to replace the Java object with the JSON format. That is, there is a Java entity class first, such as user. Then the list data is isolated from the database, that is, a list, where each piece of data is a user entity object. If the front-end requirements change and you need to return more than one field in the current interface, you need to modify the user entity class to add new fields. In this way, all the interfaces that use this user entity class will have the new field added to the JSON data returned by the interface. Later found that you can use a method to dynamically splice the required fields as needed.

1. Demo

 PackageCom.lin.domain;ImportNet.sf.json.JSONArray;ImportNet.sf.json.JSONObject; Public classTest { Public Static voidMain (string[] args)throwsException {jsonobject createjsonobject=Createjsonobject ();    System.out.println (Createjsonobject); }         //Create a Jsonobject object    Private Staticjsonobject Createjsonobject () {jsonobject result=NewJsonobject (); Result.put ("Success",true); Result.put ("TotalCount", "30"); Jsonobject User1=NewJsonobject (); User1.put ("id", "12"); User1.put ("Name", "Zhang San"); User1.put ("Createtime", "2017-11-16 12:12:12"); Jsonobject User2=NewJsonobject (); User2.put ("id", "13"); User2.put ("Name", "John Doe"); User2.put ("Createtime", "2017-11-16 12:12:15"); Jsonobject Department=NewJsonobject (); Department.put ("id", 1); Department.put ("Name", "technical department"); User1.put ("Department", department); User2.put ("Department", department); //returns a Jsonarray objectJsonarray Jsonarray =NewJsonarray (); Jsonarray.add (0, User1); Jsonarray.add (1, User2); Result.element ("Data", Jsonarray); returnresult; } }

The JSON data returned:

2. Interface Demo

The following is a real Java interface that queries data from a database

@ResponseBody @RequestMapping (value= "/getrolemenulist.do", method=requestmethod.get) Public voidGetrolemenulist (httpservletrequest req, httpservletresponse res, Integer Roleid)throwsioexception{Res.setheader ("Content-type", "Application/json;charset=utf-8"); Res.setcharacterencoding ("UTF-8"); Reslistdata Rld=NewReslistdata (); Jsonobject result=NewJsonobject (); Try{Map<string, object> params1 =NewHashmap<>(); Params1.put ("Roleid", Roleid); Params1.put ("MenuLevel", 1); List<RoleJuri> fmenulist = Rjservice.getrolemenulist2 (PARAMS1);//level MenuJsonarray firstlist =NewJsonarray ();  for(inti=0; I<fmenulist.size (); i++) {Rolejuri Firstmenu=Fmenulist.get (i); Jsonobject Firstresult=NewJsonobject (); Firstresult.put ("id", Firstmenu.getid ()); Firstresult.put ("Name", Firstmenu.getmenuname ()); Firstresult.put ("url", Firstmenu.getmenuurl ()); Map<string, object> params2 =NewHashmap<>(); Params2.put ("Roleid", Roleid); Params2.put ("Menupid", Firstmenu.getmenuid ()); List<RoleJuri> smenulist = Rjservice.getrolemenulist2 (PARAMS2);//Level Two menuJsonarray secondlist=NewJsonarray ();  for(intj=0; J<smenulist.size (); J + +) {Rolejuri Secondmenu=Smenulist.get (j); Jsonobject Secondresult=NewJsonobject (); Secondresult.put ("id", Secondmenu.getid ()); Secondresult.put ("Name", Secondmenu.getmenuname ()); Secondresult.put ("url", Secondmenu.getmenuurl ());                Secondlist.add (Secondresult); } firstresult.put ("Children", secondlist);            Firstlist.add (Firstresult); }            if(Fmenulist.size () > 0) {//query to the first level menuResult.put ("Success", 1); Result.put ("Data", firstlist); }Else{//The first level menu is not queriedResult.put ("Success", 0); Result.put ("Data",NewArray ()); Result.put ("Error", "No access to menu data"); }        } Catch(Exception e) {result.put ("Success", 0); Result.put ("Data",NewArray ()); Result.put ("Error", "Server Run Error");    } res.getwriter (). Write (result.tostring ()); }

The JSON data returned

java-generating JSON data in any format