使用 JSoup 抓取 XML

Question

我正在尝试抓取位于 here 的 RSS 提要。

目前我只是想了解一下 JSoup，所以下面的代码只是概念证明（或者至少是一种尝试）。

    public static void grabShakers(String url) throws IOException {

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


    desc = doc.select("title");
    links = doc.select("link");
    price = doc.select("span.price");

}

它完美地抓住了每个项目的标题。每个链接的输出只是十个重复的结束链接标签，它永远不会找到任何价格。我想也许 CDATA 是问题所在，所以我将 doc 转换为 html，使用 .replace 删除了 cmets，然后将其转换回 Document 以进行解析，但无济于事。任何见解将不胜感激。

以下代码是我用来打印每个元素的代码：

for (Element src : price) {
        System.out.println(src);
    }

Answer 1

该提要存在两个问题：

1. 文档只包含<link />..actual link..，而不是完整的链接标签
2. 描述（包含price标签）是转义 Html，不会被解析

解决方案：

    final String url = "http://www.amazon.com/gp/rss/movers-and-shakers/appliances/ref=zg_bsms_appliances_rsslink";
    Document doc = Jsoup.connect(url).get();


    for( Element item : doc.select("item") ) // Select all items
    {
        final String title = item.select("title").first().text(); // select the 'title' of the item
        final String link = item.select("link").first().nextSibling().toString().trim(); // select 'link' (-1-)

        final Document descr = Jsoup.parse(StringEscapeUtils.unescapeHtml4(item.select("description").first().toString()));
        final String price = descr.select("span.price").first().text(); // select 'price' (-2-)

        // Output - Example
        System.out.println(title);
        System.out.println(link);
        System.out.println(price);
        System.out.println();
    }

注意 1： 链接的解决方法；选择（空）link 标记并获取 next 节点的文本（= 带有实际链接的 TextNode）。

注意 2： 解决价格问题；选择description 标签，取消转义html，解析它并选择价格。为了避免转义，我使用了来自Apache Commons Lang 的StringEscapeUtils.unescapeHtml4()。

输出：
_{（使用上面的链接）}

#1: Epicurean Gourmet Series 20-Inch-by-15-Inch Cutting Board with Cascade Effect, Nutmeg with Natural Core
http://www.amazon.com/Epicurean-Gourmet-20-Inch-15-Inch-Cutting/dp/B003MU9PLU/ref=pd_zg_rss_ms_la_appliances_1
$72.95

#2: GE 45600 Z-Wave Basic Handheld Remote
http://www.amazon.com/GE-45600-Z-Wave-Handheld-Remote/dp/B0013V6RW0/ref=pd_zg_rss_ms_la_appliances_2
$3.00

#3: First Alert RD1 Radon Gas Test Kit
http://www.amazon.com/First-Alert-RD1-Radon-Test/dp/B00002N83E/ref=pd_zg_rss_ms_la_appliances_3
$10.60

#4: Presto 04820 PopLite Hot Air Popper, White
http://www.amazon.com/Presto-04820-PopLite-Popper-White/dp/B00006IUWA/ref=pd_zg_rss_ms_la_appliances_4
$9.99

#5: New 20 oz Espresso Coffee Milk Frothing Pitcher, Stainless Steel, 18/8 gauge
http://www.amazon.com/Espresso-Coffee-Frothing-Pitcher-Stainless/dp/B000FNK3Z4/ref=pd_zg_rss_ms_la_appliances_5
$8.19

#6: PUR 18 Cup Dispenser with One Pitcher Filter DS-1800Z
http://www.amazon.com/PUR-Dispenser-Pitcher-Filter-DS-1800Z/dp/B0006MQCA4/ref=pd_zg_rss_ms_la_appliances_6
$22.17

#7: Hamilton Beach 70610 500-Watt Food Processor, White
http://www.amazon.com/Hamilton-Beach-70610-500-Watt-Processor/dp/B000SAOF5S/ref=pd_zg_rss_ms_la_appliances_7
$21.95

#8: West Bend 77203 Electric Can Opener, Metallic
http://www.amazon.com/West-Bend-77203-Electric-Metallic/dp/B00030J1U2/ref=pd_zg_rss_ms_la_appliances_8
$35.79

#9: Custom Leathercraft 2077L Black Ski Glove, Large
http://www.amazon.com/Custom-Leathercraft-2077L-Black-Glove/dp/B00499BS9A/ref=pd_zg_rss_ms_la_appliances_9
$8.83

#10: Cuisinart CPC-600 1000-Watt 6-Quart Electric Pressure Cooker, Brushed Stainless and Matte Black
http://www.amazon.com/Cuisinart-CPC-600-1000-Watt-Electric-Stainless/dp/B000MPA044/ref=pd_zg_rss_ms_la_appliances_10
$64.95