Java thousand ask _08jdk detailed (011) _JNLP file is what

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1. What is a JNLP file?

JNLP (Java Network launching Protocol, Java Web Execution protocol file) is a way for Java to execute Java applications directly from a browser, It allows you to open a Java application directly from a URL link on a Web page.

Java Desktop applications can be published in a JNLP manner. If the version is upgraded, it is not necessary to release the version to all users, only the version of the server needs to be updated, which is equivalent to the advantages of having a Java application with a Web application. If you use JNLP to package an application, it can:

• Install and use the correct version of the JRE (Java Runtime Environment).
• Load the application from a browser or desktop.
• Detects the new version and automatically downloads the latest version.
• To speed up the startup, the classes that the application needs are cached in the native cache.
• Download the original library if necessary.
• Use native resources such as file systems in a secure manner.
• Automatically locates and loads externally dependent resources.

We can use the Javaws command to download and run the Java applications maintained in the JNLP file. Learn Javaws See here: What is the difference between Java, JAVAW, javaws

2. What are the benefits of using JNLP?

Publishing an app with the JNLP file has the following benefits:

• Others cannot change the content of your JNLP file, such as adding a random library, or changing the application's information.
• Allows arbitrary Java Virtual Machine (JVM) options and Java System Properties to be used in the application.
• Prevent others from referencing your applet jar file directly in the HTML browser.

3. What is the Jnlp file like?

JNLP is a standard file that describes the URL of the application, the basic information about the application (application name, version, vendor, app icon, etc.), the necessary system environment, and so on.

Template name: Jnlp-inf/application_template. JNLP. The name must be uppercase. The template content is as follows:

<?xml version= "1.0" encoding= "UTF-8"?><jnlp codebase="*"><information><title>SampleApp</title><vendor>Sample Company</Vendor><icon href="*"/><offline-allowed/></Information><resources><java version="1.3+"/><jar href="Sampleapp.jar"/></Resources><application-desc main-class="com.sample.SampleApp"/></jnlp>

Java thousand ask _08jdk detailed (011) _JNLP file is what