HTML data for parsing can be stored in different types of sources such as local file, a string, or a URI. Let's have a look at how we can handle these types of input for parsing using Jsoup.
Create the
Documentclass structure from Jsoup, depending on the type of input.If the input is a string, use:
String html = "<html><head><title>jsoup: input with string</title></head><body>Such an easy task.</body></html>"; Document doc = Jsoup.parse(html);
If the input is from a file, use:
try { File file = new File("index.html"); Document doc = Jsoup.parse(file, "utf-8"); } catch (IOException ioEx) { ioEx.printStackTrace(); }If the input is from a URL, use:
Document doc = Jsoup.connect("http://www.example.com").get();
Include the correct package at the top.
import org.jsoup.Jsoup; import.jsoup.nodes.Document;
Basically, all the inputs will be given to the Jsoup class to parse.
For an HTML string, you just need to pass the HTML string as parameter for the method Jsoup.parse().
For an HTML file, there are three parameters inputted for Jsoup.parse(). The first one is the file object, which points to the specified HTML file; the second one is the character set of the file. There is an overload of this method with an additional third parameter, Jsoup.parse(File file, String charsetName, String baseUri). The baseUri URL is the URL from where the HTML file is retrieved; it is used to resolve relative paths or links.
For a URL, you need to use the Jsoup.connect() method. Once the connection succeeds, it will return an object, thus implementing the connection interface. Through this, you can easily get the content of the URL page using the Connection.get() method.
The previous example is pretty easy and straightforward. The results of parsing from the Jsoup class will return a Document object, which represents a DOM structure of an HTML page, where the root node starts from <html>.
Besides receiving the well-formed HTML as input, Jsoup library also supports input as a body fragment. This can be seen at the following location:
http://jsoup.org/apidocs/org/jsoup/Jsoup.html#parseBodyFragment(java.lang.String)
Tip
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