JSON-tree-structured data is turned into Java objects and stored in a database implementation-a super simple JSON complex data processing.

In the development of the site often encounter cascading data display, such as the choice of cities when the city of the provinces and counties to choose the interface. Many front-end producers are accustomed to getting provincial and county data from JSON rather than from a database. Then in the choice of cities and counties in a city, stored in the database needs to store the selected city code. So you need an ability to import JSON data (typically stored in JavaScript scripts) into the database.

JSON is characterized by support for hierarchies, objects that support array representations. The following example describes how to save the city and county data of JSON to a database in a very simple way: by using the JSON Java Toolkit API, the hierarchical JSON object array is preferred to be converted to a Java object array recursively, and then saved to the database.

The implementation steps are:

(i) first define a Jsonitem entity class:

Package org.openjweb.core.entity;

public class Jsonitem
{
Private String sub_id;
Private String Sub_name;
Private jsonitem[] items;

Public jsonitem[] GetItems () {
return items;
}
public void Setitems (jsonitem[] items) {
This.items = items;
}
Public String getsub_id () {
return sub_id;
}
public void setsub_id (String sub_id) {
this.sub_id = sub_id;
}
Public String Getsub_name () {
return sub_name;
}
public void Setsub_name (String sub_name) {
This.sub_name = Sub_name;
}

}

(b) Define a tool class, read the JSON data file in the tool class, and make a recursive call:

public static string Importjson (String fullfilename,string jsontype,string encoding,httpservletrequest request) throws Exception
{
JSON conversion to entity class reference: Http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html
String Sreturn = "";
String jsondata = "";
Try
{
Jsondata = Fileutil.gettextfilecontent (fullfilename, encoding);
}
catch (Exception ex)
{
Sreturn = "Read JSON file failed!";
}

Get Rootid
Logger.info ("");
Jsondata = Jsondata.replace ("\" items\ ": \" "", ""); Get rid of empty items
String parentid = jsondata.substring (Jsondata.indexof ("\" id\ ":") +5);
ParentID = parentid.substring (0,parentid.indexof (",")). Trim ();
ParentID = Parentid.replace ("\", "");
Logger.info ("root id==" +parentid);
String parentname = jsondata.substring (Jsondata.indexof ("\" name\ ":") +7);
ParentName = parentname.substring (0,parentname.indexof (",")). Trim ();
ParentName = Parentname.replace ("\", "");
Logger.info ("root name==" +parentname);
String rootdata = jsondata.substring (Jsondata.indexof ("\" items\ ":") +8,jsondata.lastindexof ("}"));
Rootdata = jsondata.substring (Jsondata.indexof ("[") +1,jsondata.lastindexof ("]"));
Different JSON id,name representations are not the same, uniformly replaced by Sub_id,subname to match the Jsonitem class attributes
Facilitate unified processing after replacement
Rootdata = Rootdata.replace ("city_id", "sub_id");
Rootdata = Rootdata.replace ("sub_city", "sub_name");
Rootdata = Rootdata.replace ("City", "Sub_name");

Rootdata = Rootdata.replace ("Sub_txt", "sub_name");

Rootdata = Rootdata.replace ("Sub_industry", "sub_name");
Rootdata = Rootdata.replace ("industry_id", "sub_id");
Rootdata = Rootdata.replace ("Industry", "Sub_name");

Rootdata = Rootdata.replace ("Sub_profession", "sub_name");
Rootdata = Rootdata.replace ("profession_id", "sub_id");
Rootdata = Rootdata.replace ("profession", "sub_name");



Convert Rootdata to Array
Rootdata = "[" + Rootdata + "]";
Try
{
Fileutil.str2file (Rootdata, "D:/jsondata.txt", "utf-8");//Storage to disk check string conversion is correct
}
catch (Exception ex)
{

}
Jsonarray Jsonarray = Jsonarray.fromobject (Rootdata);
object[] os = Jsonarray.toarray ();
jsonitem[] items = (jsonitem[]) Jsonarray.toarray (Jsonarray, Jsonitem.class);

Savejsonent (Jsontype,parentid,parentname, "-1", New Long (1));

Dealjson (Items,parentid,jsontype,new Long (1));
return sreturn;
}

private static void Savejsonent (String jsontype,string jsonid,string jsonname,string parentid,long levelid) throws Excep tion
{
Logger.info (jsontype+ "/" +jsonid+ "/" +jsonname+ "/" +parentid+ "/" +string.valueof (Levelid) ");
Commjsondata ent = new Commjsondata ();
Ent.setjsontype (Jsontype);
Ent.setjsoncode (Jsonid);
Ent.setjsonname (Jsonname);
Ent.setrowid (Stringutil.getuuid ());
Ent.setparentcode (ParentID);
Ent.setlevelid (Levelid);
Idbsupportservice service = (idbsupportservice) servicelocator.getbean ("IDBSupportService3");
Service.saveorupdate (ENT);

}

private static String Dealjson (jsonitem[] jsonitem,string parentid,string jsontype,long level)
{
String Sreturn = "";
if (jsonitem!=null&&jsonitem.length>0)
{
for (int i=0;i<jsonitem.length;i++)
{
Jsonitem ent = jsonitem[i];
System.out.println (ent.getsub_id ());
System.out.println (Ent.getsub_name ());
Try
{
Savejsonent (jsontype,ent.getsub_id (), Ent.getsub_name (), parentid,level+1);
}
catch (Exception ex)
{
Ex.printstacktrace ();
}
if (Ent.getitems ()!=null)
{
System.out.println ("Number of subkeys:" +ent.getitems (). length);
Dealjson (Ent.getitems (), ent.getsub_id (), jsontype,level+1);
}
Else
{
System.out.println ("No subkeys!");
}
}
}
This function
return sreturn;


}

Sample data (partial):

{
"Name": "National",
"id": "0000000000",
"description": "Chong Tak Yi City Data",
"Modified": "August 2012",
"Copyright": "http://www.chongdeyi.com/",
"Items": [
{
"City": "Beijing",
"city_id": "1001000000",
"Items": [
{
"Sub_city": "Dongcheng District",
"sub_id": "2001001000"
},
{
"Sub_city": "Xicheng District",
"sub_id": "2001002000"
},
{
"Sub_city": "Chaoyang District",
"sub_id": "2001006000"
},
{
"Sub_city": "Fengtai District",
"sub_id": "2001007000"
},
{
"Sub_city": "Shijingshan District",
"sub_id": "2001008000"
},
{
"Sub_city": "Haidian District",
"sub_id": "2001009000"
},
{
"Sub_city": "Mentougou District",
"sub_id": "2001010000"
},
{
"Sub_city": "Fangshan District",
"sub_id": "2001011000"
},
{
"Sub_city": "Tongzhou District",
"sub_id": "2001012000"
},
{
"Sub_city": "Shunyi District",
"sub_id": "2001013000"
},
{
"Sub_city": "Changping District",
"sub_id": "2001014000"
},
{
"Sub_city": "Daxing District",
"sub_id": "2001015000"
},
{
"Sub_city": "Huairou",
"sub_id": "2001016000"
},
{
"Sub_city": "Pinggu District",
"sub_id": "2001017000"
},
{
"Sub_city": "Yanqing County",
"sub_id": "2001018000"
},
{
"Sub_city": "Miyun County",
"sub_id": "2001019000"
}]
},{
"City": "Tianjin",
"city_id": "1002000000",
"Items": [
{
"Sub_city": "Zone of Peace",
"sub_id": "2002001000"
},