Shulou(Shulou.com)06/02 Report--

Today, I would like to talk to you about how to understand Applet and Servlet. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something from this article.

In the design of today's multi-tier web applications, we can use both Java Applet and Servlet. Applet provides a convenient mechanism for establishing a powerful dynamic interface, and Servlet provides an efficient means for web servers or other application servers to process requests. Sun's application model describes the specification for developing enterprise-level Java applications on the Java 2 platform. One recommended specification is to use Applet, HTML, and JSP on the front end, and Servlet and other components supported by Enterprise JavaBeans on the back end.

The key to this architecture is the communication between the Applet on the client and the ervlet on the server. However, because Applet is limited by the browser security mode, accessing data and information in an Applet is not as simple as it seems. In this article, we will explain the limitations faced by developers in the Applet-Servlet architecture and explore several different communication strategies that can transfer data between Applet and Servlet. If you are already familiar with Applet and Servlet, this will certainly help you read this article, and if you are not already familiar with it, it doesn't matter, we will briefly introduce them.

Brief introduction of Applet and Servlet

Java Applets is actually a Java program that runs on a web page. It is a Java class that inherits from java.Applet.Applet and is embedded in a HTML page by reference, just like an image. The combination of Applet and HTML can create a more powerful dynamic interface. For some Applet that is used only for scrolling text and playing animations, we can use it in an enterprise application to display and process data from resources on the server. For example, an Applet can be used to browse and modify records in a database or to control other applications running on the server.

Java Applet can use other classes in addition to its own defined class files, whether they exist independently or are packaged into a JAR file. Applet and its class files are distributed through standard HTTP requests, so Applet can be sent over the firewall of the platform where the web page data resides. Except when it comes to maintaining application integrity, Applet automatically refreshes every time a user revisits the web host and retains it on the client for a period of time.

Thanks to the platform independence of the Java operating system, Applet can run on any browser with a Java virtual machine (JVM). Sun's Java plugin can even use the * * version of JVM to create pages without having to worry about being limited by the version of JVM on your user's browser.

Because Applet is an extension of the Java platform, you can reuse existing Java components when you build an interface to build your web applications with Applet. As we can see in the following example, you can use complex Java objects in your Applet components to develop work that would otherwise be done by a server-side application. In fact, you can write Java code that can be executed either on Applet or within an application.

Applet has the capabilities of all traditional Java applications, including the use of Sun's JFC/Swing components. Applets can also be used to make graphics and user interfaces in applications (although some auxiliary windows will be marked "Warning, Java Applet Window"). But no matter how similar they are, there are some key differences between the application and Applet. For example, we have to consider that our Applet is limited by the security mode.

After reading the above, do you have any further understanding of how to understand Applet and Servlet? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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