jre安装更新方法

nihaozhanghu

Install Java J2RE and Mozilla Plug-in
It's also very handy to have the Java run-time environment available and most importantly a Mozilla plug-in so you can view dynamic content. It's unfortunate that Mozilla will actually crash if you go to a site containing Java and you don't have the plug-in installed.

For now there is no easy way to do this but I found the following instructions on FedoraForums.org. Basically, start by downloading the Java Runtime Environment (JRE) 5.0 Update 9 (at the time I wrote this) from Sun.com. You'll want to grab the Linux RPM in self-extracting file. Then you want to install it with:

# chmod +x jre-1_5_0_09-linux-i586-rpm.bin
# ./jre-1_5_0_09-linux-i586-rpm.bin

Then you'll probably want to enable Java Plug-ins and here once again there is no easy way:

# ln -s /usr/java/jre1.5.0_09/plugin/i386/ns7/libjavaplugin_oji.so /usr/lib/mozilla/plugins

And finally you'll need to tell Fedora that you wish to use this version of Java as the preferred interpreter rather than the Open Source version that's installed by default. You'll of course need to adjust the full pathname if you install a newer version of the jre than the one in this example:

# /usr/sbin/alternatives --install /usr/bin/java java /usr/java/jre1.5.0_09/bin/java 1509
# java -version
java version "1.5.0_09"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_09-b05)
Java HotSpot(TM) Client VM (build 1.5.0_09-b05, mixed mode, sharing)

If you know of an easier way please post it to the Comments section below.
实在不想翻译啦，大家将就看看吧，没时间翻译说，不好意思了