java jsonobject 转换_java – 将JSONObject转换为JSONArray

我目前正在学习一些使用JAVA的

android编程.我的老师分享了这段代码,它将使用API​​,获取其

JSON文件,并将其转换为

JSONArray文件.然后,他将遍历该JSONArray并将它们放入ArrayList,然后将它们显示在一个活动上.

问题是我正在使用的API会返回一个JSONObject文件,而我不知道如何正确地将其转换为JSONArray.

import android.util.Log;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import java.io.BufferedInputStream;

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

import java.util.HashMap;

public class JSONParser {

String charset = “UTF-8”;

HttpURLConnection conn;

DataOutputStream wr;

StringBuilder result;

URL urlObj;

JSONArray jObj = null;

StringBuilder sbParams;

String paramsString;

public JSONArray makeHttpRequest(String url, String method) {

sbParams = new StringBuilder();

if(method.equals(“GET”)){

// request method is GET

if (sbParams.length() != 0) {

url += “?” + sbParams.toString();

}

try {

urlObj = new URL(url);

conn = (HttpURLConnection) urlObj.openConnection();

conn.setDoOutput(false);

conn.setRequestMethod(“GET”);

conn.setRequestProperty(“AccountKey”, “pVU56+0hI26DNLeTzlU/Dw==”);

conn.setRequestProperty(“UniqueUserId”, “33c07f2f-b4c0-4151-acd3-e0829b303d2c”);

conn.setRequestProperty(“accept”, “application/json”);

conn.setConnectTimeout(15000);

conn.connect();

} catch (IOException e) {

e.printStackTrace();

}

}

try {

//Receive the response from the server

InputStream in = new BufferedInputStream(conn.getInputStream());

BufferedReader reader = new BufferedReader(new InputStreamReader(in));

result = new StringBuilder();

String line;

while ((line = reader.readLine()) != null) {

result.append(line);

}

Log.d(“JSON Parser”, “result: ” + result.toString());

} catch (IOException e) {

// e.printStackTrace();

}

conn.disconnect();

// try parse the string to a JSON object

try {

jObj = new JSONArray(result.toString());

} catch (JSONException e) {

Log.e(“JSON Parser”, “Error parsing data ” + e.toString());

}

// return JSON Object

return jObj;

}

}

API URL及其自定义标头：

URL: http://datamall2.mytransport.sg/ltaodataservice/TaxiAvailability

包头中

AccountKey: pVU56+0hI26DNLeTzlU/Dw==

UniqueUserId: 33c07f2f-b4c0-4151-acd3-e0829b303d2c

accept: application/json

EDIT2：我使用它来获取带有自定义标头的原始数据.

http://requestmaker.com/

编辑：这是我得到的JSON.

{

“odata.metadata”: “http://datamall2.mytransport.sg/ltaodataservice/$metadata#TaxiAvailability”,

“value”: [

{

“Longitude”: 103.84009,

“Latitude”: 1.35989

},

{

“Longitude”: 103.84679,

“Latitude”: 1.35544

},

{

“Longitude”: 103.76928,

“Latitude”: 1.4419

}

….

]

}