如何请求 JSON 在 URL 中有空格？

Question

当我尝试不使用 space 的 URL 时，它运行良好。但是，当我添加 space 时，会出现以下错误：

Caused by: java.lang.IllegalArgumentException: Illegal character in path at index 79: http://api.wunderground.com/api/81eb946ab954bdcb/hourly/lang/q/Canada/Bachelors Island Marine.json

当我在浏览器中尝试时，它有效。
PS：我尝试对 URL 进行编码，但出现了同样的错误。

代码：

    package com.example.elie.myapplication;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.util.Log;

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

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

/**
 * Async task class to get json by making HTTP call
 * */
public class GetWeatherInfo extends AsyncTask<Void, Void, Void> {

    private  String mCity;
    private OnTaskComplete onTaskComplete;

    private ProgressDialog pDialog;

    // URL to get Country
    private static String url ;

    // JSON Node names
    private static final String TAG_FORECAST="hourly_forecast";
    private static final String TAG_CONDITION="condition";
    private static final  String TAG_HOUR="hour";
    private static final  String TAG_DATE="pretty";
    private static final  String TAG_FCTTIME="FCTTIME";
    private static final  String TAG_HUMIDITY="humidity";
    private static final  String TAG_UVI="uvi";


    //The calling Activity
    private Activity mActivity;

    private WeatherInfo mWeather;

    //Country name
    private String mCountry;
    private JSONArray mForecast;

    //Constructor
    public GetWeatherInfo(Activity act,String country,String city)  {
        mWeather=new WeatherInfo();
        mCountry=country;
        mCity=city;
        mActivity=act;
        url = "http://api.wunderground.com/api/81eb946ab954bdcb/hourly/lang/q/"+country+"/"+mCity+".json";
        url.replaceAll(" ","%20");
        Log.d("URL",url);
        this.execute();

    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        // Showing progress dialog
        pDialog = new ProgressDialog(mActivity);
        pDialog.setMessage("Getting weather conditions...");
        pDialog.setCancelable(false);
        pDialog.show();

    }

    @Override
    protected Void doInBackground(Void... arg0) {
        // Creating service handler class instance
        ServiceHandler sh = new ServiceHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

        Log.d("Response: ", "> " + jsonStr);

        if (jsonStr != null) {
            try {

                mWeather.setCityName(mCity);
                mWeather.setCountryName(mCountry);

                JSONObject jsonObj = new JSONObject(jsonStr);

                // Getting JSON Array node
                mForecast = jsonObj.getJSONArray(TAG_FORECAST);

                // 1st element JSON object
                JSONObject firstElement =mForecast.getJSONObject(0);

                // FCTTIME JSON object
                JSONObject FCTTIME =firstElement.getJSONObject(TAG_FCTTIME);
                mWeather.setHour24(Integer.parseInt(FCTTIME.getString(TAG_HOUR)));
                mWeather.setDate(FCTTIME.getString(TAG_DATE));

                mWeather.setHumidity(Integer.parseInt(firstElement.getString(TAG_HUMIDITY)));
                mWeather.setUVIndex(Integer.parseInt(firstElement.getString(TAG_UVI)));

                mWeather.setCondition(firstElement.getString(TAG_CONDITION));

            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }

        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        // Dismiss the progress dialog
        if (pDialog.isShowing())
            pDialog.dismiss();
        onTaskComplete.setMyTaskComplete(mWeather);
    }

    public String getCountry()
    {
        return mCountry;
    }

    public interface OnTaskComplete {
        public void setMyTaskComplete(WeatherInfo message);
    }
    public void setMyTaskCompleteListener(OnTaskComplete onTaskComplete) {
        this.onTaskComplete = onTaskComplete;
    }
}

错误：

02-12 18:43:04.098 5547-6459/com.example.elie.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #3 java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask.done(AsyncTask.java:299) at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) at java.util.concurrent.FutureTask.setException(FutureTask.java:124) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) at java.util.concurrent.FutureTask.run(FutureTask.java:137) at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:230) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) at java.lang.Thread.run(Thread.java:856) Caused by: java.lang.IllegalArgumentException: Illegal character in path at index 80: http://api.wunderground.com/api/81eb946ab954bdcb/hourly/lang/q/Canada/Addenbroke Island.json at java.net.URI.create(URI.java:727) at org.apache.http.client.methods.HttpGet.(HttpGet.java:75) at com.example.elie.myapplication.ServiceHandler.makeServiceCall(ServiceHandler.java:68) at com.example.elie.myapplication.ServiceHandler.makeServiceCall(ServiceHandler.java:34) at com.example.elie.myapplication.GetWeatherInfo.doInBackground(GetWeatherInfo.java:77) at com.example.elie.myapplication.GetWeatherInfo.doInBackground(GetWeatherInfo.java:18) at android.os.AsyncTask.call(AsyncTask.java:287)

Answer 1

Space 个 URL 中的字符必须编码。将 ' ' 替换为 %20.

像这样：

http://api.wunderground.com/api/81eb946ab954bdcb/hourly/lang/q/Canada/Bachelors%20Island%20Marin.json

一般来说你应该使用URLEncoder来编码URL。

url = URLEncoder.encode(url, "UTF-8");

Answer 2

尝试使用“+”或“%20”代替空格。

例如 'http://api.wunderground.com/api/81eb946ab954bdcb/hourly/lang/q/Canada/Bachelors%20Island%20Marine.json'

Answer 3

逃离你的url。应该是这样的：http://api.wunderground.com/api/81eb946ab954bdcb/hourly/lang/q/Canada/Bachelors%20Island%20Marine.json

假设你有一个字符串作为你的 url ，你可以这样做：

 url.replaceAll(" " ,"%20");

编辑

正如许多人所建议的那样，最正确的方法是：

 url = URLEncoder.encode(url, "UTF-8");

为了避免以后出现类似的问题。

如何请求 JSON 在 URL 中有空格？

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