CentOS 5.5系統上已經有安裝OpenJDK可用，如果有需要使用其他特別指定的JDK版本，例如SUN的JDK，就需要額外下載安裝。因為大部份的程式只要把 JAVA_HOME 設好就可以使用了，下載解壓版是最簡單的方式，作法是去SUN的網站下載JDK檔案後，直接解壓縮在指定的目錄下面就可以了。另一種較完整的安裝方式可以下載RPM檔，然後透過安裝RPM的方式安裝JDK，然後在CentOS上再作設定即可!!
現在紀錄安裝SUN的JRE過程：
1. 找出下載的JRE原始檔的檔名與位置
[root@easychen easy]# ll
total 20452
drwxr-xr-x 2 root root 4096 Mar 3 22:58 Download
-rw-rw-r-- 1 easy easy 20888537 Mar 3 23:26 jre-6u24-linux-i586-rpm.bin
2. 安裝JRE的RPM檔
[root@easychen easy]# sh ./jre-6u24-linux-i586-rpm.bin
Unpacking...
Checksumming...
Extracting...
UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu).
inflating: jre-6u24-linux-i586.rpm
Preparing... ########################################### [100%]
1:jre ########################################### [100%]
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
localedata.jar...
plugin.jar...
javaws.jar...
deploy.jar...
Done.
3. 查詢已經安裝的JAVA與JRE環境
[root@easychen easy]# rpm -qa | grep java
tzdata-java-2010l-1.el5
java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
java-1.6.0-openjdk-1.6.0.0-1.16.b17.el5
[root@easychen easy]# rpm -qa | grep jre
jre-1.6.0_24-fcs
4. 檢視系統內已經設定好的java環境，得知目前的環境是OpenJDK的1.6.0版
[root@easychen easy]# update-alternatives --config java
There are 2 programs which provide 'java'.
Selection Command
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
2 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
Enter to keep the current selection[+], or type selection number:
[root@easychen java]# java -version
java version "1.6.0_17"
OpenJDK Runtime Environment (IcedTea6 1.7.5) (rhel-1.16.b17.el5-i386)
OpenJDK Client VM (build 14.0-b16, mixed mode)
5. 確認目前java執行檔的位置
[root@easychen easy]# which java
/usr/bin/java
6. 檢查新安裝的JRE的版本
[root@easychen /]# cd /usr/java/jre1.6.0_24/bin
[root@easychen bin]# ll
total 788
lrwxrwxrwx 1 root root 10 Mar 3 23:32 ControlPanel -> ./jcontrol
-rwxr-xr-x 1 root root 47308 Feb 3 11:36 java
-rwxr-xr-x 1 root root 16835 Feb 3 11:36 java_vm
-rwxr-xr-x 1 root root 74417 Feb 3 11:36 javaws
-rwxr-xr-x 1 root root 6407 Feb 3 09:34 jcontrol
-rwxr-xr-x 1 root root 47447 Feb 3 11:36 keytool
-rwxr-xr-x 1 root root 47679 Feb 3 11:36 orbd
-rwxr-xr-x 1 root root 47515 Feb 3 11:36 pack200
-rwxr-xr-x 1 root root 47807 Feb 3 11:36 policytool
-rwxr-xr-x 1 root root 47447 Feb 3 11:36 rmid
-rwxr-xr-x 1 root root 47447 Feb 3 11:36 rmiregistry
-rwxr-xr-x 1 root root 47475 Feb 3 11:36 servertool
-rwxr-xr-x 1 root root 47679 Feb 3 11:36 tnameserv
-rwxr-xr-x 1 root root 189274 Feb 3 11:36 unpack200
[root@easychen bin]# ./java -version
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)
7. 新增SUN的JRE環境到系統的JAVA執行環境內
[root@easychen java]# alternatives --install /usr/bin/java java /usr/java/jre1.6.0_24/bin/java 300
8. 檢視目前可使用的JAVA環境
[root@easychen java]# alternatives --config java
There are 3 programs which provide 'java'.
Selection Command
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
2 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
3 /usr/java/jre1.6.0_24/bin/java
Enter to keep the current selection[+], or type selection number:
9. 確認原始預設的JAVA環境版本尚未變更
[root@easychen java]# java -version
java version "1.6.0_17"
OpenJDK Runtime Environment (IcedTea6 1.7.5) (rhel-1.16.b17.el5-i386)
OpenJDK Client VM (build 14.0-b16, mixed mode)
10. 替換目前環境使用的JAVA
[root@easychen java]# alternatives --config java
There are 3 programs which provide 'java'.
Selection Command
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
2 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
3 /usr/java/jre1.6.0_24/bin/java
Enter to keep the current selection[+], or type selection number: 3
11. 確認新的JAVA預設版本以變更為新版的JAVA
[root@easychen java]# alternatives --config java
There are 3 programs which provide 'java'.
Selection Command
-----------------------------------------------
* 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
2 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
+ 3 /usr/java/jre1.6.0_24/bin/java
Enter to keep the current selection[+], or type selection number:
[root@easychen java]# java -version
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)
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