Install Sun JDK on Fedora/Redhat[收藏]

 

1. Download Sun Java JDK or JRE 
Download Sun Java JDK or JRE from here (current version is JDK 6 Update 20)http://java.sun.com/javase/downloads/index.jsp.
Note: you can Skip login step.
Download rpm.bin package (example jdk-6u20-linux-i586-rpm.bin).

2. Change to root.

su -## OR ##sudo -i

3. Change right directory (example /tmp) and Make JDK or JRE binary executable

cd /tmpchmod +x jdk-6u20-linux-i586-rpm.bin

4. Run binary

./jdk-6u20-linux-i586-rpm.bin

5. Install new Sun java, javac, javaws and libjavaplugin.so (for Firefox/Mozilla) with alternatives command

alternatives --install /usr/bin/java java /usr/java/jdk1.6.0_20/jre/bin/java 20000alternatives --install /usr/bin/javaws javaws /usr/java/jdk1.6.0_20/jre/bin/javaws 20000alternatives --install /usr/lib/mozilla/plugins/libjavaplugin.so libjavaplugin.so /usr/java/jdk1.6.0_20/jre/lib/i386/libnpjp2.so 20000## Install javac only if you installed JDKalternatives --install /usr/bin/javac javac /usr/java/jdk1.6.0_20/bin/javac 20000

6. Check current java, javac, javaws and libjavaplugin.so versions

java -versionjava version "1.6.0_20"Java(TM) SE Runtime Environment (build 1.6.0_20-b02)Java HotSpot(TM) Server VM (build 16.3-b01, mixed mode) javac -versionjavac 1.6.0_20 javawsJava(TM) Web Start 1.6.0_20[...]

Note: Check libjavaplugin.so with restarting Mozilla Firefox and writing about:config on address bar.

6. Swap between OpenJDK and Sun JDK

alternatives --config java   # or javac or javaws or libjavaplugin.soThere are 3 programs which provide 'java'.   Selection    Command-----------------------------------------------   1           /usr/lib/jvm/jre-1.6.0-openjdk/bin/java   2           /usr/lib/jvm/jre-1.5.0-gcj/bin/java*+ 3           /usr/java/jdk1.6.0_20/bin/java

Some Post-Installation Setup

Set JAVA_HOME environment variable, add following to /etc/profile file or .bashrc file

export JAVA_HOME="/usr/java/jdk1.6.0_20"

原文：http://www.if-not-true-then-false.com/2010/howto-install-sun-java-jdk-jre-on-fedora-centos-red-hat/