在 arraylist 中使用 Jsoup 进行解析

Question

我如何用 jsoup 解析它？

    <!-- NOVINEEE -->
<div class="right_naslov"><a href="/e-novine">e-novine</a></div>

  <div class="right_post">
    <span class="right_post_nadnaslov"><font class="nadnaslov">Zanimljiv zadatak</font></span><span class="right_post_datum"><font class="datum">12.12.2014.</font></span>
    <span class="right_post_naslov_v"><font class="naslov"><a href="/e-novine/n/?id=340">Profesor učenicima zadao najbolji zadatak ikad!</a></font></span>
    <span class="right_post_podnaslov"><font class="podnaslov"></font></span>
    <div class="right_post_tekst"><a href="/e-novine/n/?id=340"><img width="180" align="left" class="novine_slika_thumbm" border="0" src="/fajlovi/slike/thumbm/4161-zadatak_naslovna.jpg" /></a><p>72-godi&scaron;nji profesor biv&scaron;im učenicima iz godine u godinu &scaron;alje pisma &scaron;to nije lak zadatak jer mnogi ne žive u istoj državi. Iako radi ne&scaron;to stvarno posebno, Bruce sebe i dalje smatra prosječnim profesorom. Učenici ipak smatraju suprotno...</p>
<div>&nbsp;</div></div>
    </div>
</div>

我想获取 right_naslov 的内容，以及 nadnaslov、naslov 的字体 class 以及 right_post_tekst 的 img src 和 a href。

我试过这样做：

Document doc = Jsoup.connect(url).get();
            Elements post = doc.select("right_naslov right_post nadnaslov");
            HashMap<String, String> map = new HashMap<String, String>();

            map.put("rank", post.text());
            // Get the second td
            map.put("country", post.text());
            // Get the third td
            map.put("population", post.text());

            // Set all extracted Jsoup Elements into the array
            arraylist.add(map);

然后我做：

resultp = data.get(position);

// Locate the TextViews in listview_item.xml
rank = (TextView) itemView.findViewById(R.id.rank);
country = (TextView) itemView.findViewById(R.id.country);
population = (TextView) itemView.findViewById(R.id.population);


// Capture position and set results to the TextViews
rank.setText(resultp.get(PocetnaFragment.RANK));
country.setText(resultp.get(PocetnaFragment.COUNTRY));
population.setText(resultp.get(PocetnaFragment.POPULATION));

我一直在学习这个教程：http://www.androidbegin.com/tutorial/android-jsoup-listview-images-texts-html-tables-tutorial/

有多个right_posts

谢谢

更新

在下面的答案之后（在所有评论之后）出现以下错误：

02-14 23:50:17.490    2469-2530/gimbi.edu.ba W/System.err﹕ java.lang.NullPointerException: Attempt to invoke virtual method 'org.jsoup.select.Elements org.jsoup.nodes.Element.select(java.lang.String)' on a null object reference
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at gimbi.edu.ba.PocetnaFragment$JsoupListView.doInBackground(PocetnaFragment.java:147)
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at gimbi.edu.ba.PocetnaFragment$JsoupListView.doInBackground(PocetnaFragment.java:103)
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at android.os.AsyncTask.call(AsyncTask.java:288)
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:231)
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
02-14 23:50:17.494    2469-2530/gimbi.edu.ba W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
02-14 23:50:46.713    2469-4859/gimbi.edu.ba W/System.err﹕ java.lang.NullPointerException: Attempt to invoke virtual method 'org.jsoup.select.Elements org.jsoup.nodes.Element.select(java.lang.String)' on a null object reference
02-14 23:50:46.718    2469-4859/gimbi.edu.ba W/System.err﹕ at gimbi.edu.ba.PocetnaFragment$JsoupListView.doInBackground(PocetnaFragment.java:147)
02-14 23:50:46.718    2469-4859/gimbi.edu.ba W/System.err﹕ at gimbi.edu.ba.PocetnaFragment$JsoupListView.doInBackground(PocetnaFragment.java:103)
02-14 23:50:46.719    2469-4859/gimbi.edu.ba W/System.err﹕ at android.os.AsyncTask.call(AsyncTask.java:288)
02-14 23:50:46.719    2469-4859/gimbi.edu.ba W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
02-14 23:50:46.719    2469-4859/gimbi.edu.ba W/System.err﹕ at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:231)
02-14 23:50:46.719    2469-4859/gimbi.edu.ba W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
02-14 23:50:46.719    2469-4859/gimbi.edu.ba W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
02-14 23:50:46.719    2469-4859/gimbi.edu.ba W/System.err﹕ at java.lang.Thread.run(Thread.java:818)

正如我在下面所说的，我尝试删除 img element，但是当我调用 map.put 方法时，所有元素都相同。

Answer 1

阅读此link，了解如何使用 Jsoup 提取数据。

以下是我根据您的场景举例。

    Document doc = null;
    Element aEle = null;
    Element fontEle = null;

    try {
        doc = ......

        /** Get A tag that is under DIV with classname right_naslov **/
        aEle = doc.select("div.right_naslov > a").first();
        if (aEle != null) {
            System.out.println("right_naslov content: " + aEle.ownText());
        }

        /** Get Font tag with [classname=nadnaslov] under span[classname=right_post_nadnaslov] under div[lassname=right_post]  **/
        /** Try to get Font[classname=naslov] with the following method **/
        fontEle = doc.select("div.right_post > span.right_post_nadnaslov > font.nadnaslov").first();
        if (fontEle != null) {
            System.out.println("font nadnaslov content: " + fontEle.ownText());
        }

        /** Get A tag that is under div[classname=right_post_tekst] under div[classname=right_post] **/
        aEle = doc.select("div.right_post > div.right_post_tekst > a").first();
        if (aEle != null) {
            System.out.println("a href: " + aEle.attr("href"));

            /** Get inner IMG tag with classname as 'novine_slika_thumbm' **/
            Element imgEle = aEle.select("img.novine_slika_thumbm").first();
            if (imgEle != null) {
                System.out.println("img src: " + imgEle.attr("src"));
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

以上示例仅在您正在解析的 HTML 文档中只有一个 DIV[classname=right_naslov] 或 DIV[classname=right_post] 时才有效，因为我在提取数据时使用 Elements.first()，这意味着我总是 select 第一个符合我们提取标准的元素。尝试使用 Jsoup，玩得开心。获得所有数据后，根据需要将它们存储在 Hashmap 或 ArrayList 中。

已更新

你可以做的是 select 多个 DIV[classname=right_post] 和 Document.select()，你 returns 对象 Elements。然后循环每个Element得到它的内部数据。在我的以下示例中，您将在 arraylist 变量中获得两个 HashMap 项。

有2div[classname=right_naslov]，我只检索了评论部分之后的第二个。有 5 div[classname=right_post] 我已经忽略了那些没有内部元素 span[classname=right_post_nadnaslov].

    List<HashMap<String, String>> arraylist = new ArrayList<HashMap<String, String>>();
    Elements aEles = null;
    Elements divRightPostEles = null;
    String rightNaslov = null;
    Document doc = null;

    try {
        doc = Jsoup.connect(url).get();

        /** Get A tag that is under DIV with classname right_naslov **/
        aEles = doc.select("div.right_naslov > a");
        if (aEles != null && aEles.size() > 0) {
            if (aEles.size() == 2)
                rightNaslov = aEles.get(1).ownText();
            else
                rightNaslov = aEles.first().ownText();
        }

        /**
         * Since you say there are multiple DIV with right_post as
         * classname, we will get all those right post elements and loop
         * them one by one to retrieve its inner elements
         **/
        divRightPostEles = doc.select("div.right_post");

        for (Element rightPostDiv : divRightPostEles) {
            /** Each loop of this represents a right_post DIV element **/

            HashMap<String, String> map = new HashMap<String, String>();

            /**
             * Get Font tag with [classname=nadnaslov] under
             * span[classname=right_post_nadnaslov] under
             * div[lassname=right_post]
             **/
            /** Try to get Font[classname=naslov] with the following method **/
            Elements fontNadnaslov = rightPostDiv
                    .select("span.right_post_nadnaslov > font.nadnaslov");

            /**
             * Get A tag that is under div[classname=right_post_tekst] under
             * div[classname=right_post]
             **/
            Element aRightPostTekst = rightPostDiv.select(
                    "div.right_post_tekst > a[href]").first();

            // Retrive Jsoup Elements
            if (fontNadnaslov != null && fontNadnaslov.size() > 0) {
                map.put("country", fontNadnaslov.first().ownText());

                if (aRightPostTekst != null) {
                    map.put("population", aRightPostTekst.attr("href"));

                    Element img = aRightPostTekst.select("img[src]").first();

                    if (img != null)
                        map.put("image", img.attr("src"));
                }

                if (rightNaslov != null)
                    map.put("rank", rightNaslov);
                // Set all extracted Jsoup Elements into the array
                arraylist.add(map);
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

在 arraylist 中使用 Jsoup 进行解析

Parsing with Jsoup in arraylist

xml

android

html-parsing

jsoup