URL에 JSON의 Java 배열을 만듭니다.

Question

URL이 있습니다. 내가 할 필요가 자바에서이 읽기 및 ArrayList에 넣어됩니다

["england","france","germany","america","denmark","italy","greece","portugal","poland"] 

: 그것에서는 이러한 형식의 간단한 JSON 배열이있다.

너무 간단하게 들렸지 만 몇 시간 동안 사용해 보았습니다.

package com.example.landmarksapp; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.Reader; 
import java.net.URL; 
import java.nio.charset.Charset; 
import java.util.ArrayList; 
import java.util.List; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

/** 
* Fetches JSON results and returns into correct format for the GUI 
* @author Alicia 
* 
*/ 
public class Conector { 
    private String urlToCities = "http://jagdeep.co:8080/LandmarkServers-0.1/city/listJSON/"; 

    /** 
    * Fetches list of cities 
    * @param urlToCities the link to the JOSN file with the list of cities 
    * @return ArrayList<String> of cities 
    * @throws IOException 
    * @throws JSONException 
    */ 
    public List<String> fetchCities(String urlToCities) throws IOException, JSONException { 
     List<String> result = new ArrayList(); 
     JSONObject jsonResults = readJsonFromUrl(urlToCities); 
     return result; 
    } 

    /** 
    * @inheritDoc 
    */ 
    public List<String> fetchCities() throws IOException, JSONException { 
     return fetchCities(urlToCities); 
    } 

    /** 
    * 
    * @param rd 
    * @return 
    * @throws IOException 
    */ 
    private String readAll(Reader rd) throws IOException { 
     StringBuilder sb = new StringBuilder(); 
     int cp; 
     while ((cp = rd.read()) != -1) { 
      sb.append((char) cp); 
      System.out.println(cp); 
     } 
     return sb.toString(); 
    } 

    /** 
    * 
    * @param url 
    * @return 
    * @throws IOException 
    * @throws JSONException 
    */ 
    private JSONObject readJsonFromUrl(String url) throws IOException, JSONException { 
     InputStream is = new URL(url).openStream(); 
     try { 
      BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); 
      String jsonText = readAll(rd); 
      JSONObject json = new JSONObject(jsonText); 
      return json; 
     } finally { 
      is.close(); 
     } 
    } 
} 

Answer 1

랩 응답 텍스트를 JSONArray로 대신 :

이것은 내가 지금까지 한 일이다.

List<String> countries = new ArrayList<String>(); 
String json = "[\"england\",\"france\",\"germany\",\"america\"," + 
     "\"denmark\",\"italey\",\"greece\",\"portugal\",\"poland\"]"; 

JSONArray countryArr = new JSONArray(json); 
for (int i = 0; i < countryArr.length(); i++) { 
    countries.add(countryArr.getString(i)); 
} 
System.out.println(countries); 

출력 :

[england, france, germany, america, denmark, italey, greece, portugal, poland]