파일 JSON 파일 읽기

[주인장]

package data.process;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStreamReader;

import org.json.simple.JSONArray;

import org.json.simple.JSONObject;

import org.json.simple.parser.JSONParser;

import org.json.simple.parser.ParseException;

public class ParsingJSONFiles {

       public static void main(String[] args) {

             File dataFile = new File("datas/files/Books.json");

             try {

                    InputStreamReader isr = new InputStreamReader(new FileInputStream(dataFile));

                    JSONParser parser = new JSONParser();

                    Object obj = parser.parse(isr);

                    JSONObject jsonObj = (JSONObject)obj;

                    Object obj2 = jsonObj.get("books");  // StudyingAzae 출력

                    JSONArray jsonArr = (JSONArray)obj2;

                    if (jsonArr.size() > 0){

                        for(int i=0; i<jsonArr.size(); i++){

                            JSONObject jsonBook = (JSONObject)jsonArr.get(i);

                            System.out.println("Title : " + (String)jsonBook.get("title"));

                            Object edition = jsonBook.get("edition");

                            if(edition != null) {

                                 System.out.println("edition : " + (Long)edition);

                            }

                            JSONArray authors = (JSONArray)jsonBook.get("authors");

                            if (authors != null){

                                     for(int j=0; j <authors.size(); j++){                                       

                                         System.out.println("author : " + (String)authors.get(j));

                                     }

                            } 

                            Object author = jsonBook.get("author");

                            if(author != null) {

                                 System.out.println("author : " + (String)author);

                            }

                            System.out.println("publisher : " + (String)jsonBook.get("publisher"));

                            System.out.println("year : " + (Long)jsonBook.get("year"));

                            Object isbn = jsonBook.get("isbn");

                            if(isbn != null) {

                                 System.out.println("isbn : " + (String)isbn);

                            }

                            System.out.println();

                        }

                    }

             } catch (FileNotFoundException e) {

                    e.printStackTrace();

             } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

             } catch (ParseException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

             }

       }

}