使用Java从html页面提取单个值:

问题描述：

我正在继续从事一段时间的项目，而我一直在努力从网站上获取一些数据.该网站有一个iframe，可从未知来源提取一些数据.数据在iframe中的代码中是这样的:

I am continuing work on a project that I've been at for some time now, and I have been struggling to pull some data from a website. The website has an iframe that pulls in some data from an unknown source. The data is in the iframe in a tag something like this:

<DIV id="number_forecast"><LABEL id="lblDay">9,000</LABEL></DIV>

上面有很多其他废话，但是这个div id/标签是完全唯一的，在代码中的其他任何地方都没有使用.

There is a BUNCH of other crap above it but this div id / label is totally unique and is not used anywhere else in the code.

答

jsoup 可能就是您想要的，它表现出色从HTML文档中提取数据.

jsoup is probably what you want, it excels at extracting data from an HTML document.

有许多示例显示了如何使用API: http://jsoup. org/cookbook/extracting-data/selector-syntax

There are many examples available showing how to use the API: http://jsoup.org/cookbook/extracting-data/selector-syntax

该过程将分为两个步骤:

The process will be in two steps:

解析页面并找到iframe的网址
解析iframe的内容并提取所需的信息

代码如下:

 // let's find the iframe
 Document document = Jsoup.parse(inputstream, "iso-8859-1", url);
 Elements elements = document.select("iframe");
 Element iframe = elements.first();

 // now load the iframe
 URL iframeUrl = new URL(iframe.absUrl("src"));
 document = Jsoup.parse(iframeUrl, 15000);

 // extract the div
 Element div = document.getElementById("number_forecast");

使用Java从html页面提取单个值:

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