将空元素添加到不存在的元素

Question

我想在以下 div 中解析来自网页的数据：

我想从可以提供以下内容的网页中解析数据：

<div class="InseratDaten">
    <div class="Art">Rent</div>
    <div class="Ort">TestCity 3., Roads Street</div>
    <div class="Preis"><span class='Label'>Miete:</span> 950 EUR</div>
    <div class="Groesse"><span class='Label'>Fläche:</span> 72 m²</div>
    <div class="Zimmer"><span class='Label'>Zimmer:</span> 3</div>
</div>

但是，有时这些结构看起来完全不同，例如：

<div class="InseratDaten">
    <div class="Art">Rent</div>
    <div class="Ort">Test 3., Road Street</div>
    <div class="Preis"><span class='Label'>Miete:</span> 919 EUR</div>
    <div class="Groesse"><span class='Label'>Fläche:</span> 84 m²</div>
    <div class="Zimmer"><span class='Label'>Zimmer:</span> 3</div>
    <div class="EigTitel">weitere Eigenschaften:</div>
    <div class='EigListe'>Shower, Balcony, Dog</div>
</div>

或

<div class="InseratDaten">
    <div class="Art">Sale</div>
    <div class="Ort">Test 4., Road Street</div>
    <div class="Preis"><span class='Label'>Miete:</span> 919 EUR</div>
    <div class="Groesse"><span class='Label'>Fläche:</span> 84 m²</div>
</div>

如您所见，后面的代码被<div class="EigTitel"> 扩展或缺少某些元素。

目前我正在这样解析我的数据：

    if (page.getParseData() instanceof HtmlParseData) {
        HtmlParseData htmlParseData = (HtmlParseData) page.getParseData();
        String html = htmlParseData.getHtml();
        Document doc = Jsoup.parseBodyFragment(html);
        Elements title = doc.select("div[class=Title]");
        Elements art = doc.select("div[class=Art]");
        Elements location = doc.select("div[class=Ort]");
        Elements price = doc.select("div[class=Preis]");
        Elements size = doc.select("div[class=Groesse]");
        Elements numberOfRooms = doc.select("div[class=Zimmer]");
        Elements furtherProperties = doc.select("div[class=EigListe]");

        /**
         * get each element as List
         */
        if (!(art.isEmpty()) && !(location.isEmpty()) && !(title.isEmpty()) && !(price.isEmpty())) {
            //iterate over art cause all elems have the same size
            titleList = new ArrayList<String>();
            artList = new ArrayList<String>();
            locationList = new ArrayList<String>();
            priceList = new ArrayList<String>();
            sizeList = new ArrayList<String>();
            numberOfRoomsList = new ArrayList<String>();
            furtherPropertiesList = new ArrayList<String>();

            //price
            for (Element element : price) {
                priceList.add(element.text().toString());
            }
            //size
            for (Element element : size) {
                sizeList.add(element.text().toString());
            }
            //numberOfRooms
            for (Element element : numberOfRooms) {
                numberOfRoomsList.add(element.text().toString());
            }
            //furtherProperties
            for (Element element : furtherProperties) {
                furtherPropertiesList.add(element.text().toString());
            }
            //location
            for (Element element : location) {
                locationList.add(element.text().toString());
            }   
            //art
            for (Element element : art) {
                artList.add(element.text().toString());
            }
            //title
            for (Element element : title) {
                titleList.add(element.text().toString());
            }

            log.info(ListstoString());

            //add everything to the main domain List
            for (int i = 0; i < locationList.size(); i++) {
                Property prop = new Property();
                //price
                prop.setPrice(priceList.get(i));
                //size
                prop.setSize(sizeList.get(i));
                //number of rooms
                prop.setNumberOfRooms(numberOfRoomsList.get(i));
                //furtherProperties
                prop.setFurtherProperties(furtherPropertiesList.get(i));
                //location
                prop.setLocation(locationList.get(i));
                //art
                prop.setTransactionType(artList.get(i));
                //title
                prop.setTitle(titleList.get(i));
                //set date
                prop.setCrawlingDate(new Date());
                list.add(prop);
            }
            log.info(list.toString());
   }
}

我的问题是，在某些情况下，我的列表长度可能会有所不同，因为数据可能会丢失，因此我会收到错误消息：

[sizeList=16, priceList=16, locationList=16, numberOfRoomsList=12, furtherPropertiesList=12]

我想将空元素放在 div 没有此类属性的地方，以保持我的数据一致。我想这与 jsoup 将空元素放在那里有关吗？有什么想法可以实现吗？

非常感谢您的回答！

Answer 1

您可以创建预定义大小的列表，例如：

titleList = Arrays.asList(new String[locationList.size()]);

然后在设置元素的时候使用索引：

for (int i = 0; i < title.size(); i++) {
  titleList.set(i, title.get(i).text().toString());
}