如何通过Java程序读取网页内容？

Question

I am planning to write a Java program to read some exchange rates from a web site (http://www.doviz.com) and was wondering what is the best approach to only read (or read the whole and strip the parts needed) the content that I need.

Any help is appreciated.

Answer 1

My advice is to use the Jsoup library

It's very easy to parse an external content with a css/jquery-like syntax

// Only one line to parse an external content
Document doc = Jsoup.connect("http://jsoup.org").get();

// "Javascript-like" syntax
Element content = doc.getElementById("content");
Elements links = content.getElementsByTag("a");
for (Element link : links) {
  String linkHref = link.attr("href");
  String linkText = link.text();
}

// "Jquery/Css-like" syntax
Elements resultLinks = doc.select("h3.r > a");
Elements pngs = doc.select("img[src$=.png]");

Just add the jsoup.jar library to your classpath and enjoy !
Open-Source and free to use of course.

Answer 2

我建议您（以编程方式）实现网页的RSS读取机制，并使用标准解析器提取RSS xml的内容。