无法使用JAVA从网站提取xml数据 [英] Unable to extract xml data from website using JAVA

问题描述

我正在尝试使用JAVA在给定的经度和纬度下提取酒店名称的数据.我收到以下错误:[致命错误]:1:1:序言中不允许内容. 这是我尝试从中提取信息的代码和URL.关于这个问题有什么建议吗?

I'm trying to extract data for the hotel names at the given latitude and longitude in JAVA. I'm getting the following error: [Fatal Error] :1:1: Content is not allowed in prolog. Here is the code and the URL from where I am trying to extract my information. Any suggestion about the issue?

              URL url = new URL("https://api.eancdn.com/ean-services/rs/hotel/v3/list?apiKey=vkndmgahz5aekd65pxg4rvvp&locale=en_US&currencyCode=USD&latitude=51.514&longitude=-0.269"");
              InputStream is = url.openStream();
              DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
              DocumentBuilder db = dbf.newDocumentBuilder();
              Document doc = db.parse(is);

                NodeList itemList = 
                        doc.getElementsByTagName("HotelSummary");
                Node itemNode;
                Element itemElt;


                for(int k=0; k < itemList.getLength(); k++)
                {
                    itemNode = itemList.item(k);

                    if(itemNode.getNodeType() == Node.ELEMENT_NODE) {
                        itemElt = (Element) itemNode;
                        System.out.println("Hotel name: "+itemElt.getElementsByTagName("name").item(0).getTextContent());

推荐答案

出了什么问题

如果运行以下代码，您将看到返回的数据不是XML，而是JSON.

What's Going Wrong

If you run the following code, you will see the data you are getting back is not XML, but JSON.

import java.net.URL;
import java.io.InputStream;

public class Demo {

    public static void main(String[] args) throws Exception {
        URL url = new URL("https://api.eancdn.com/ean-services/rs/hotel/v3/list?apiKey=vkndmgahz5aekd65pxg4rvvp&locale=en_US&currencyCode=USD&latitude=51.514&longitude=-0.269");
        InputStream is = url.openStream();

        int next = is.read();
        while(next != -1) {
            System.out.print((char) next);
            next = is.read();
        }
    }

}

以XML格式获取数据

您可以使用HttpURLConnection以XML格式请求数据:

Getting the Data as XML

You can use an HttpURLConnection to request the data as XML:

import java.net.HttpURLConnection;
import java.net.URL;
import java.io.InputStream;
import javax.xml.parsers.*;
import org.w3c.dom.Document;

public class Demo {

    public static void main(String[] args) throws Exception {
        URL url = new URL("https://api.eancdn.com/ean-services/rs/hotel/v3/list?apiKey=vkndmgahz5aekd65pxg4rvvp&locale=en_US&currencyCode=USD&latitude=51.514&longitude=-0.269");

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setRequestProperty("Accept", "application/xml");
        InputStream is = connection.getInputStream();

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc = db.parse(is);
    }

}

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