Javahelp API introduction and basic concepts
Javahelp API is a Java library for creating an online help system.It provides a simple and flexible way to add help documents to Java applications.The Javahelp API allows developers to create and organize help content to provide users with simple and clear documents.
The basic concepts of Javahelp API include:
1. HelpSet: Help set is the main concept of Javahelp API.It is a collection of help documents, which can include a series of topics, table of contents, and indexes.
2. Topic: The theme is the independent unit of the document, which is usually expressed as the HTML file.It can contain various contents such as text, images, links.
3. Table of Contents: The directory is used to organize and navigate the theme in the document.It provides a hierarchical structure that can quickly browse and find the required themes.
4. Index: The index provides a keyword list, which users can find related topics through keywords.Developers can define one or more themes for each keyword.
5. Search: Search function allows users to search for themes in the document through keywords.Javahelp API provides search engines for developers to integrate search functions into applications.
Below is a simple example of creating a help system using Javahelp API:
import javax.help.*;
import javax.swing.*;
import java.net.URL;
public class HelpExample {
public static void main(String[] args) {
try {
// Create a help set
URL hsURL = HelpExample.class.getResource("/help/HelpSet.hs");
HelpSet helpSet = new HelpSet(null, hsURL);
// Create the help window
HelpBroker helpBroker = helpSet.createHelpBroker();
helpBroker.setSize(new java.awt.Dimension(800, 600));
// Create the help button
JButton helpButton = new JButton("帮助");
helpButton.addActionListener(e -> helpBroker.setDisplayed(true));
// Add the help button to the application interface
Jframe frame = new jframe ("java application");
frame.getContentPane().add(helpButton);
frame.setSize(400, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
In the above example, we first loaded helpset.hs through the HELPSET class.We then create a HelpBroker object that will be used to display help content.Finally, we create a help button and add it to the application interface.
Please note that this is just a simple example. The actual Javahelp application may involve more complex help document organizations and more custom configurations.
To sum up, the Javahelp API provides a powerful tool that can easily create an online help system for Java applications.Developers can use it to create and organize help documents to provide users with effective help and support.
