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<HTML><HEAD> <TITLE>BBS水木清华站∶精华区</TITLE></HEAD><BODY><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER>发信人: Yapith (早起的鸟儿有食吃), 信区: Java <BR>标 题: Java Plugin使用说明---如何使用jdk1.2的applet(一) <BR>发信站: BBS 水木清华站 (Sat Sep 18 19:35:11 1999) <BR> <BR>老有网友问在jdk1.2下编写的applet如何使用的问题。因此贴一下这 <BR>方面的资料。大家在SUN的主页上也是可以看到的。 <BR> 因为时间的原因,没有翻译,直接给大家贴上的了。原文虽然 <BR>很罗嗦,但不是很难懂。:-) <BR> 如果你只是关心如何让applet工作起来,本篇java plugin overview <BR>就可以不看了,直接去看第二篇就可以了。不过建议大家看看此文。 <BR> <BR>Java Plug-in 1.2.2 Overview <BR>Introduction <BR>JavaTM Plug-in software from Sun Microsystems Inc. enables <BR>web page authors to direct Java applets or JavaBeansTM components <BR>on their intranet web pages to run using Sun's Java 2 Runtime <BR>Environment, Standard Edition (JRE), instead of the browser's <BR>default runtime. This release provides support for Microsoft <BR>Internet Explorer and Netscape Navigator on various Win32 platforms. <BR>Java Plug-in delivers full Java 2 SDK, Standard Edition v 1.2.2 <BR>support for Internet Explorer and Navigator users. <BR>Java Plug-in is designed for enterprise customers who wish to <BR>deploy Java 2 SDK 1.2.2-based applets on their intranet web <BR>pages today. Specifically, web pages modified to support Java <BR>Plug-in enable users to run Java 2 SDK 1.2.2-based applets in <BR>Internet Explorer or Navigator. Java Plug-in integrates today's <BR>widely adopted web browsers with the benefits of all of the new <BR>features and capabilities of Java 2 SDK 1.2.2 <BR>(see <A HREF="http://java.sun.com/products/jdk/1.2/docs/relnotes/">http://java.sun.com/products/jdk/1.2/docs/relnotes/</A> <BR>features.html for a list of new features found in Java 2 SDK 1.2.2). <BR>Java Plug-in is ready for the high-performance "Project Java(tm) <BR>HotSpot(tm)" virtual machine with a future-ready architecture. <BR>This means that when Sun adds new features or functionality to <BR>the Java 2 SDK, users can take full advantage of them in <BR>Internet Explorer and Navigator immediately by deploying the <BR>latest release of the Java Plug-in. This makes the process of <BR>upgrading all users in an enterprise to the latest Java 2 SDK <BR>feature set as easy as modifying one web page on your intranet. <BR>Java Plug-in Features <BR>Java Plug-in delivers several key capabilities to enterprises <BR>using Internet Explorer and Navigator: <BR> Full Java 2 SDK 1.2.2 support: Enables enterprise <BR>developers to develop and deploy applets, taking full advantage <BR>of Java 2 SDK 1.2.2 features and functionality, such as JFC 1.1, <BR>JavaBeans enhancements and so on. <BR> Future-ready Java 2 SDK Architecture: Java Plug-in features <BR>an architecture that makes it easy for Sun to bring new Java 2 SDK <BR>features and functionality, including those contained in the high <BR>performance Project Java HotSpot virtual machine, to Windows and <BR>Solaris desktops much more quickly than has been previously possible. <BR> Free public download and easy install: Upon encountering a <BR>web page that specifies Java Plug-in, the browser will download and <BR>install all the necessary files and render the applet, requiring <BR>minimal user intervention. <BR> Free Java Plug-in HTML Converter: Makes it easy and automatic <BR>for IS managers and web page authors to modify their HTML pages to <BR>specify the use of Java Plug-in rather than the browser's default <BR>Java runtime. <BR>Installing and Running the Java Plug-in <BR>The first time the web browser encounters a web page that specifies <BR>the use of the Java Plug-in, the browser must download and install <BR>the required files. System administrators can determine where users <BR>download Java Plug-in software; either from <A HREF="http://java.sun.com">http://java.sun.com</A> or <BR>from an internal server. Download and install times will vary <BR>depending on the type of network connection and overall system <BR>performance. Typical total download and installation times (over a <BR>local area network) will vary from three to ten minutes. In subsequent <BR>encounters of web pages that specify the use of the Java Plug-in, it <BR>is invoked instantaneously from the user's hard drive and the applet <BR>is rendered. <BR>Internet Explorer: When Internet Explorer first encounters a web page that s <BR>pecifies Java Plug-in, Internet Explorer will ask the user if it is OK to do <BR>wnload an ActiveX control that is digitally signed by Sun Microsystems, Inc. <BR> and verifiable by the associated VeriSign Class 3 certificate. If the user <BR>says "Yes," Internet Explorer will quickly download a small ActiveX control <BR>from Sun's web site that will handle downloading the main Java Plug-in Activ <BR>eX control and Sun's JRE. This will include selecting the appropriate locale <BR>-specific JRE and offering the user a list of suitable download sites. It wi <BR>ll then download the files automatically and install them. The Java Plug-in <BR>ActiveX control will then run and use its parameters in the <OBJECT> tag to <BR>render the applet. The next time Internet Explorer encounters a web page tha <BR>t specifies the Java Plug-in, Internet Explorer will seamlessly load and run <BR> the ActiveX control and JRE from the local disk, requiring no user interven <BR>tion. <BR>Netscape Navigator: When Navigator first encounters a web page that specifie <BR>s Java Plug-in, users will see a plugin-missing picture on the HTML page. Wh <BR>en the user clicks on this picture, Navigator will direct the user to the Ja <BR>va Plug-in download page. Users can then download the version of Java Plug-i <BR>n and install it. Once it is installed, Java Plug-in will then run and use i <BR>ts parameters in the <EMBED> tag to render the applet. The next time Navigat <BR>or encounters a web page that specifies the Java Plug-in, Navigator will sea <BR>mlessly load and run the plug-in and JRE from the local disk, requiring no u <BR>ser intervention. <BR>How the Java Plug-in Works <BR>The Java Plug-in does not replace or modify the browser's underlying Java ru <BR>ntime. Rather, it enables web page authors to specify the use of Sun's JRE i <BR>nstead of the default Java runtime for a given web page. This ensures enterp <BR>rise developers that Java 2 SDK 1.2.2-based applets are executed with full s <BR>upport for all of the features and capabilities of Java 2 SDK 1.2.2 (see htt <BR>p://java.sun.com/products/jdk/1.2/docs/relnotes/features.html for a list of <BR>new features found in Java 2 SDK 1.2.2. <BR>Internet Explorer: Java Plug-in leverages Internet Explorer's extension mech <BR>anisms in order to allow Sun's JRE to run inside Internet Explorer. The tech <BR>nology used to achieve this is Microsoft's COM/ActiveX. Using the HTML <OBJE <BR>CT> tag, web page authors can run ActiveX controls or COM components as part <BR> of a web page. Internet Explorer provides elaborate mechanisms for download <BR>ing and caching ActiveX controls. This makes it possible for the web browser <BR> to use Sun's JRE with minimal user intervention. <BR>Netscape Navigator: The Java Plug-in leverages Navigator's plug-in architect <BR>ure in order to allow Sun's JRE to run inside Navigator, much like users can <BR> run QuickTime movies or Shockwave animations with plug-ins today. Using the <BR> HTML <EMBED> tag, web page authors can cause plug-ins to be run as part of <BR>a web page. This makes it possible for the web browser to use Sun's JRE in N <BR>avigator. <BR>In order to utilize all of the features and capabilities of Java 2 SDK 1.2.2 <BR> in Internet Explorer or Navigator, web page authors must specify the use of <BR> Sun's JRE using the Java Plug-in. Thus, web pages must be modified in order <BR> to invoke Sun's JRE. Sun provides a written specification to guide web page <BR> authors on how to make these changes. In addition, Sun provides the Java Pl <BR>ug-in HTML Converter, free of charge, that will automatically make the chang <BR>es to the selected set of HTML pages. <BR>Java Plug-in Documentation <BR> Java Plug-in FAQ <BR> Java Plug-in Documentation <BR>System Requirements <BR>The minimum system requirements for the Java Plug-in <BR>
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