java - 安卓 : Reading XML data from URL using JAVA

Question

您好，我正在尝试从 URL 读取 XML 数据

XML 结构如下:

<specialoffers>
  <categories>...</categories>
  <categories>...</categories>
  <categories>...</categories>
  <categories>...</categories>
  <categories>...</categories>
  <categories>...</categories>

XML:

<specialoffers>
<categories>
   <category>
       <![CDATA[ 0% Installment Payment Plan Offers ]]>
   </category>
   <merchants>
       <merchantname>
         <![CDATA[ EmaxIPP ]]>
       </merchantname>
       <merchantbigimage>
         <![CDATA[
         http://www.XXX.com/Images/Emax%20New%20-%20190x73-1_tcm20-48180.jpg]]>
         </merchantbigimage>

        <merchantsmallimage>
         <![CDATA[
         http://www.XXX.com/Images/Emax%20New%20-%20104x75-1_tcm20-48179.jpg
          ]]>
         </merchantsmallimage>

        <merchantmobileimage>
         <![CDATA[ http://www.XXX.com ]]>
       </merchantmobileimage>
       <mobilehighlight>
         <![CDATA[
        Enjoy 0% Installment Payment Plan for 3 months on 
        all purchases made </b>
        ]]>
       </mobilehighlight>
        <locations>
             <location>
                <emirate>
               <![CDATA[ XXX]]>
                </emirate>
               <address>
               <![CDATA[ Center 1 ]]>
               </address>
               <latitude>
               <![CDATA[ 51.169601 ]]>
                  </latitude>
               <longitude>
               <![CDATA[ 61.240395 ]]>
               </longitude>
             </location>
       </merchants>

   </categories>
 </specialoffers>

Java代码如下:

    URL url = new URL(URL);
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    DocumentBuilder db = dbf.newDocumentBuilder();
    Document doc = db.parse(url.openStream());

    NodeList nodeList = doc.getElementsByTagName("category");

    for (int i = 0; i < nodeList.getLength(); i++) {
        Element element = (Element)nodeList.item(i);
        System.out.println(element.getFirstChild().getTextContent());



        NodeList nodeList2 = doc.getElementsByTagName("merchants");
        Element getChds = (Element)nodeList2.item(i);

        for (int  j=0; j < nodeList.getLength() ; j++){

            NodeList nodeList3 = doc.getElementsByTagName("merchantname");
            Element element1 = (Element)nodeList3.item(j);
            System.out.println("--"+element1.getFirstChild().getTextContent());
        }
    } 

我尝试在所有“类别”中显示类别和商家名称，并且能够显示所有类别的类别名称，但无法显示商家名称。

这是实际的 xml 字符串:http://www.adcb.com/specialoffers-test.xml

尝试打印:

0% Installment Payment Plan Offers 
 --EmaxIPP 
 --Delma Medical Centre
 .
 .
Dining Offers
 --Lounge Cafe
 --India Palace Restaurant
 .
 .

Answer 1

当尝试打印商家时，您实际上是在迭代名为nodeList的category NodeList的长度>。您需要迭代nodeList2。

for (int  j=0; j < nodeList2.getLength() ; j++){ 
    NodeList nodeList3 = doc.getElementsByTagName("merchantname");
    Element element1 = (Element)nodeList3.item(j);
    System.out.println("--"+element1.getFirstChild().getTextContent());
} 

您使用的是 nodeList 的长度(6)，而不是 nodeList2 的长度(16)。使用上面的内容将打印

--EmaxIPP
--Delma Medical Centre
--Lounge Cafe
--India Palace Restaurant
--Ashas-Wafi
--Dome Cafe
--Delma Medical Center
--Jacky's Electronics
--Dreamland Aqua Park
--Yas Island Rotana
--Dubai Dolpharium
--Autodrome
--Singapore - Grand Hyatt Singapore
--Thailand - Dusit Thani Laguna Phuket
--Joyalukkas
--LifeStyle Fine Jewelry