Analysis and excellent principle of Bootstrap framework in the Java class library
Analysis and optimization of the principle of Bootstrap framework in the Java class library
introduce:
Bootstrap is an open source front -end framework and is widely used in Web development.In the Java library, the Bootstrap framework is used to quickly build a user interface and enhance the user experience.This article will analyze the principle of the Bootstrap framework and put forward some optimization methods to better use Bootstrap to develop Java applications.
1. Analysis of the principle of Bootstrap framework
1. HTML/CSS/JavaScript: Bootstrap framework is based on HTML, CSS and JavaScript.It provides a rich CSS style and JavaScript plug -in, allowing developers to use predefined classes and methods to create various interface elements and functions.
2. grid system: The Bootstrap framework uses a response grid system, which can automatically adjust the layout according to the different screen size of the device.By specifying different CSS classes, adaptive page layouts can be achieved.
3. Components: Bootstrap provides many components including navigation bar, buttons, forms, modal frames, etc.These components have predefined styles and interaction behaviors, which greatly simplify the development process.
4. Response design: Bootstrap framework supports the response design, which can be automatically adapted according to the screen size of different devices.Developers can provide a better user experience by specifying different CSS classes on different devices.
Second, optimization method
1. Minimize file loading: The bootstrap frame contains a large number of CSS and JavaScript files. In order to increase the page loading speed, you can use Bootstrap custom tools to select the required components and generate minimized files.
2. Compression file: Use the tool to compress the CSS and JavaScript files of Bootstrap, which can reduce the volume of the file and speed up the page loading speed.
3. Localized resources: Storage of Bootstrap's CSS and JavaScript files in the local area instead of loading from the CDN server, which can reduce network requests and increase page loading speed.
4. Caches: For the Bootstrap files often used, you can use the browser cache to improve access speed.Set the correct HTTP header information so that the browser can cache these files.
5. Non -blocking rendering: Place Bootstrap's CSS file on the head of the page, and place the JavaScript file at the bottom of the page.This can ensure that the page will not be blocked when loading the CSS file, and increase the rendering speed of the page.
Example code:
The following is a sample code for creating a simple web page using Bootstrap:
<!DOCTYPE html>
<html>
<head>
<title>My Webpage</title>
<link rel="stylesheet" href="bootstrap.min.css">
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">My Webpage</a>
</nav>
<div class="container">
<h1>Welcome to my webpage!</h1>
<button type="button" class="btn btn-primary">Click me</button>
</div>
<script src="jquery.min.js"></script>
<script src="bootstrap.min.js"></script>
</body>
</html>
In the above example, we use the `navbar` component provided by Bootstrap to create a navigation bar and use the` Container` class to wrap the content area.At the same time, we also use the Bootstrap button style to create a button.
Summarize:
By analyzing the principle of the Bootstrap framework in the Java library and proposing some optimization methods, we can better use Bootstrap to develop Java applications.The optimization method can improve the loading speed of the page and improve the user experience.It is hoped that this article can provide readers with some references using the Bootstrap framework in Java development.
