老有網友問在jdk1.2下編寫的applet如何使用的問題。因此貼一下這方面的資料。大家在SUN的主頁上也是可以看到的。 因為時間的原因，沒有翻譯，直接給大家貼上的了。原文雖然很羅嗦，但不是很難懂。:-)
如果你只是關心如何讓applet工作起來，本篇java plugin overview就可以不看了，直接去看第二篇就可以了。不過建議大家看看此文。
Java Plug-in 1.2.2 Overview
Introduction
JavaTM Plugin software from Sun Microsystems Inc. enablesweb page authors to direct Java applets or JavaBeansTM
componentson their intranet web pages to run using Sun's Java 2 Runtime
Environment, Standard Edition (JRE), instead of the browser'sdefault runtime. This release provides support for Microsoft
Internet Explorer and Netscape Navigator on various Win32 platforms.Java Plugin delivers full Java 2 SDK,
Standard Edition v 1.2.2support for Internet Explorer and Navigator users.Java Plugin is designed for enterprise customers
who wish todeploy Java 2 SDK 1.2.2-based applets on their intranet web
pages today. Specifically, web pages modified to support Java
Plug-in enable users to run Java 2 SDK 1.2.2-based applets in
Internet Explorer or Navigator. Java Plug-in integrates today's
widely adopted web browsers with the benefits of all of the new
features and capabilities of Java 2 SDK 1.2.2
(see http://java.sun.com/products/jdk/1.2/docs/relnotes/
features.html for a list of new features found in Java 2 SDK 1.2.2).
Java Plug-in is ready for the high-performance "Project Java(tm)
HotSpot(tm)" virtual machine with a future-ready architecture.
This means that when Sun adds new features or functionality to
the Java 2 SDK, users can take full advantage of them in
Internet Explorer and Navigator immediately by deploying the
latest release of the Java Plug-in. This makes the process of
upgrading all users in an enterprise to the latest Java 2 SDK
feature set as easy as modifying one web page on your intranet.
Java Plug-in Features
Java Plug-in delivers several key capabilities to enterprises
using Internet Explorer and Navigator:
Full Java 2 SDK 1.2.2 support: Enables enterprise
developers to develop and deploy applets, taking full advantage
of Java 2 SDK 1.2.2 features and functionality, such as JFC 1.1,
JavaBeans enhancements and so on.
Future-ready Java 2 SDK Architecture: Java Plug-in features
an architecture that makes it easy for Sun to bring new Java 2 SDK
features and functionality, including those contained in the high
performance Project Java HotSpot virtual machine, to Windows and
Solaris desktops much more quickly than has been previously possible.
Free public download and easy install: Upon encountering a
web page that specifies Java Plug-in, the browser will download and
install all the necessary files and render the applet, requiring
minimal user intervention.
Free Java Plug-in HTML Converter: Makes it easy and automatic
for IS managers and web page authors to modify their HTML pages to
specify the use of Java Plug-in rather than the browser's default
Java runtime.
Installing and Running the Java Plug-in
The first time the web browser encounters a web page that specifies
the use of the Java Plug-in, the browser must download and install
the required files. System administrators can determine where users
download Java Plug-in software; either from http://java.sun.com or
from an internal server. Download and install times will vary
depending on the type of network connection and overall system
performance. Typical total download and installation times (over a
local area network) will vary from three to ten minutes. In subsequent
encounters of web pages that specify the use of the Java Plug-in, it
is invoked instantaneously from the user's hard drive and the applet
is rendered.
Internet Explorer: When Internet Explorer first encounters a web page that s
pecifies Java Plug-in, Internet Explorer will ask the user if it is OK to do
wnload an ActiveX control that is digitally signed by Sun Microsystems, Inc.
and verifiable by the associated VeriSign Class 3 certificate. If the user
says "Yes," Internet Explorer will quickly download a small ActiveX control
from Sun's web site that will handle downloading the main Java Plug-in Activ
eX control and Sun's JRE. This will include selecting the appropriate locale
-specific JRE and offering the user a list of suitable download sites. It wi
ll then download the files automatically and install them. The Java Plug-in
ActiveX control will then run and use its parameters in the <OBJECT> tag to
render the applet. The next time Internet Explorer encounters a web page tha
t specifies the Java Plug-in, Internet Explorer will seamlessly load and run
the ActiveX control and JRE from the local disk, requiring no user interven
tion.
Netscape Navigator: When Navigator first encounters a web page that specifie
s Java Plug-in, users will see a plugin-missing picture on the HTML page. Wh
en the user clicks on this picture, Navigator will direct the user to the Ja
va Plug-in download page. Users can then download the version of Java Plug-i
n and install it. Once it is installed, Java Plug-in will then run and use i
ts parameters in the <EMBED> tag to render the applet. The next time Navigat
or encounters a web page that specifies the Java Plug-in, Navigator will sea
mlessly load and run the plug-in and JRE from the local disk, requiring no u
ser intervention.
How the Java Plug-in Works
The Java Plug-in does not replace or modify the browser's underlying Java ru
ntime. Rather, it enables web page authors to specify the use of Sun's JRE i
nstead of the default Java runtime for a given web page. This ensures enterp
rise developers that Java 2 SDK 1.2.2-based applets are executed with full s
upport for all of the features and capabilities of Java 2 SDK 1.2.2 (see htt
p://java.sun.com/products/jdk/1.2/docs/relnotes/features.html for a list of
new features found in Java 2 SDK 1.2.2.
Internet Explorer: Java Plug-in leverages Internet Explorer's extension mech
anisms in order to allow Sun's JRE to run inside Internet Explorer. The tech
nology used to achieve this is Microsoft's COM/ActiveX. Using the HTML <OBJE
CT> tag, web page authors can run ActiveX controls or COM components as part
of a web page. Internet Explorer provides elaborate mechanisms for download
ing and caching ActiveX controls. This makes it possible for the web browser
to use Sun's JRE with minimal user intervention.
Netscape Navigator: The Java Plug-in leverages Navigator's plug-in architect
ure in order to allow Sun's JRE to run inside Navigator, much like users can
run QuickTime movies or Shockwave animations with plug-ins today. Using the
HTML <EMBED> tag, web page authors can cause plug-ins to be run as part of
a web page. This makes it possible for the web browser to use Sun's JRE in N
avigator.
In order to utilize all of the features and capabilities of Java 2 SDK 1.2.2
in Internet Explorer or Navigator, web page authors must specify the use of
Sun's JRE using the Java Plug-in. Thus, web pages must be modified in order
to invoke Sun's JRE. Sun provides a written specification to guide web page
authors on how to make these changes. In addition, Sun provides the Java Pl
ug-in HTML Converter, free of charge, that will automatically make the chang
es to the selected set of HTML pages.
Java Plug-in Documentation
Java Plug-in FAQ
Java Plug-in Documentation
System Requirements
The minimum system requirements for the Java Plug-in
on Win32 are as follows:
- Windows 95, Windows 98 or Windows NT 4.0
- Internet Explorer 3.02 and higher, Navigator 3.0 and higher
- Pentium 90 MHz or faster processor
- 25 MB free hard disk space
- 16 MB (24 MB recommended) system RAM
Java Plug-in works best over direct LAN (that is, Ethernet)
connections. It will also function properly over dial-up
modem (28.8 or faster).
凡是有該標志的文章，都是該blog博主Caoer（草兒）原創，凡是索引、收藏
、轉載請注明來處和原文作者。非常感謝。