在Android中向urlConnection添加头部

Question

我正在尝试通过url api在android中解析一个XML文件。

尽管我一直收到以下错误：

I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
    (HTTPLog)-Static: isSBSettingEnabled false
W/System.err: java.io.FileNotFoundException: 
W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:251)
        at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getInputStream(DelegatingHttpsURLConnection.java:210)
        at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:26)
        at com.example.finalyearapp.Carbonfootprint.HandleXml$1.run(HandleXml.java:102)
        at java.lang.Thread.run(Thread.java:764)

我相信没有找到文件，因为我没有正确地添加标题，目前我是这样调用链接的：

我的Stringurl：

  String url = "https://apis.berkeley.edu/coolclimate/footprint input_size=" + population +
                "&input_footprint_transportation_fuel1=1"+
                "&input_footprint_transportation_miles1="+miles+
                "&input_footprint_transportation_mpg1="+ mpg +
                "&input_footprint_transportation_bus="+ bushours +
                "&input_footprint_transportation_commuter=" + trainhours +
                "&input_footprint_shopping_goods_default_furnitureappliances=" + household +
                "&input_footprint_shopping_goods_default_clothing=" + clothes +
                "&input_footprint_shopping_goods_default_other_personalcare=" + beauty +
                "&input_footprint_shopping_goods_default_other_entertainment=" + entertainment +
                "&input_footprint_housing_electricity_dollars="+yearlyvalue+
                "&input_footprint_housing_naturalgas_dollars="+ yearlyvalue +
                " -H \"accept: application/json\" -H \"app_id: #\" -H \"app_key: #";

你可以看到url的末尾，我有头。

我怎么称呼它：

public void fetchXML(){
Thread thread = new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            URL url = new URL(urlstring);
            HttpURLConnection connect = (HttpURLConnection) url.openConnection();
            connect.setReadTimeout(100000);
            connect.setConnectTimeout(150000);
            connect.setRequestMethod("GET");
            connect.setDoInput(true);
            connect.connect();

            InputStream stream = connect.getInputStream();
            xmlFactoryObject = XmlPullParserFactory.newInstance();
            XmlPullParser myparser = xmlFactoryObject.newPullParser();
            myparser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
            myparser.setInput(stream, null);
            parseXMLAndStoreIt(myparser);
            stream.close();


        }catch (Exception e){
            e.printStackTrace();
        }


    }
});

Answer 1

您可以通过在HttpURLConnection上调用setRequestProperty来添加标头。

connect.setRequestProperty("Content-Type", "application/json");

在尝试解析回复之前，您可能应该检查响应代码并继续处理http 200。

在这里提问时，您还应该注意不要共享API密钥之类的私有数据。