Java Web Start - Wikipedia. In computing, Java Web Start (also known as Java. WS, javaws or JAWS) is a framework developed by Sun Microsystems (now Oracle) that allows users to start application software for the Java Platform directly from the Internet using a web browser. Some key benefits of this technology include seamless version updating for globally distributed applications and greater control of memory allocation to the Java virtual machine. Functionality. By default they run in the same sandbox as applets, with several minor extensions like allowing to load and save the file that is explicitly selected by the user through the file selection dialog. Only signed applications can be configured to have additional permissions.
Official list of all MIME types assigned by the IANA (Internet Assigned Number Authority). In computing, Java Web Start (also known as JavaWS, javaws or JAWS) is a framework developed by Sun Microsystems (now Oracle) that allows users to start application software for the Java Platform directly from the Internet using a web browser. FO Designer for the Java . Documentation J4L FO Designer 1.6 Introduction Requirements Setup & startup Delivered files The user interface The information panel. This topic describes signed JNLP files and JNLP templates. A signed JNLP file is a JNLP file that is included in a signed JAR file before the JAR file is signed. This FAQ complements Sun's official Java Web Start FAQ page and aims to provide you with information that is not included on the official page for whatever reason. If you just started with Web Start, please check Sun's Official Java Web Start/JNLP FAQ page first. Web Start has an advantage over applets in that it overcomes many compatibility problems with browsers' Java plugins and different JVM versions. Web Start programs are no longer an integrated part of the web page, they are independent applications that run in a separate frame. Web Start can also launch unmodified applets that are packaged inside . JNLP file. This file can also pass the applet parameters. Such applets also run in a separate frame. Applet launcher may not support some specific cases like loading class as resource. Like applets, Java Web Start is cross- platform. Implementation. This file describes the application requirements, code location, parameters and additional permissions (if any). The browser downloads this file as any other and (following its MIME type, application/x- java- jnlp- file) opens it with Web Start tool. Web Start tool downloads all necessary resources and launches the application. Java Web Start provides a series of classes in the javax. Sun designed most of these services with the aim of allowing carefully controlled access to resources (such as files and the system clipboard) while restricting the application to authorized operations. Sun introduced version 1. Web Start in March 2. Since J2. SE 1. 4 Web Start comes as a default part of Java Runtime Environment (JRE) called javaws, computer administrators no longer have to install it separately. Java Network Launching Protocol (JNLP). The JNLP protocol, defined with an XML schema, specifies how to launch Java Web Start applications. JNLP consists of a set of rules defining how exactly to implement the launching mechanism. JNLP files include information such as the location of the jar package file and the name of the main class for the application, in addition to any other parameters for the program. A properly configured browser passes JNLP files to a Java Runtime Environment (JRE) which in turn downloads the application onto the user's machine and starts executing it. The development of JNLP took place under the Java Community Process as JSR 5. It includes the original 1. The user does not have to remain connected to the Internet to execute the downloaded programs, because they execute from a locally maintained cache. Updates of the software download from the Web and become available when the user has a connection to the Internet, thus easing the burden of deployment. Any computer user can use JNLP simply by installing a JNLP client (most commonly Java Web Start). The installation can occur automatically such that the end- user sees the client launcher downloading and installing the Java application when first executed. JNLP works in a similar fashion to how HTTP/HTML works for the web. For rendering an HTML webpage, after the user clicks on a weblink, the browser submits a URL to a webserver, which replies with an HTML file. The browser then requests the resources referred to by this file (images, css), and finally renders the page once it has received enough information. Page rendering usually starts before all resources have downloaded; some resources not critical to the layout of the page (such as images) can follow on afterwards. JNLP mirrors this process; in the same way that a Web browser renders a webpage, a JNLP client . After the user clicks on a weblink, the browser submits an URL to a webserver, which replies with a JNLP file (instead of a HTML file) for the application. The JNLP client parses this file, requests the resources specified (jar files), waits for the retrieval of all required resources, and then launches the application. The JNLP file can list resources as . Such file contains all necessary references and is self- sufficient to launch the application. As no permissions are requested, the code will run in a sandbox. JNLP also states that this application can run offline (if already cached) and should be updated as a background process.< ? It can compress a large jar file to one- ninth of its original size if it contains only Java classes. When Sun introduced Java SE 6u. Pack. 20. 0 support became available without the need for special server support. Application designers can enable or disable this feature within JNLP files. On slow connections Pack. Signed Web Start applications. But publishers can remove these restrictions by signing their Web Start applications with the jarsigner tool that comes with the JDK.
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