RedHat5.4 JDK安装步骤
1.下载jdk http://www.oracle.com/technetwork/java/javase/downloads/jdk6downloads-1902814.html2.上传到linux下
[*]# rz
[*]rz waiting to receive.
[*]Starting zmodem transfer.Press Ctrl+C to cancel.
[*]Transferring jdk-6u29-linux-i586-rpm.bin...
[*]100% 78780 KB 3751 KB/s 00:00:21 0 Errors
3.赋予执行权限
[*]# chmod +x jdk-6u29-linux-i586-rpm.bin
4.安装
[*]# ./jdk-6u29-linux-i586-rpm.bin
[*]Unpacking...
[*]Checksumming...
[*]Extracting...
[*]UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu).
[*]inflating: jdk-6u29-linux-i586.rpm
[*]inflating: sun-javadb-common-10.6.2-1.1.i386.rpm
[*]inflating: sun-javadb-core-10.6.2-1.1.i386.rpm
[*]inflating: sun-javadb-client-10.6.2-1.1.i386.rpm
[*]inflating: sun-javadb-demo-10.6.2-1.1.i386.rpm
[*]inflating: sun-javadb-docs-10.6.2-1.1.i386.rpm
[*]inflating: sun-javadb-javadoc-10.6.2-1.1.i386.rpm
[*]Preparing... ###########################################
[*] 1:jdk ###########################################
[*]Unpacking JAR files...
[*] rt.jar...
[*] jsse.jar...
[*] charsets.jar...
[*] tools.jar...
[*] localedata.jar...
[*] plugin.jar...
[*] javaws.jar...
[*] deploy.jar...
[*]Installing JavaDB
[*]Preparing... ###########################################
[*] 1:sun-javadb-common ########################################### [ 17%]
[*] 2:sun-javadb-core ########################################### [ 33%]
[*] 3:sun-javadb-client ########################################### [ 50%]
[*] 4:sun-javadb-demo ########################################### [ 67%]
[*] 5:sun-javadb-docs ########################################### [ 83%]
[*] 6:sun-javadb-javadoc ###########################################
[*]
[*]Java(TM) SE Development Kit 6 successfully installed.
[*]
[*]Product Registration is FREE and includes many benefits:
[*]* Notification of new versions, patches, and updates
[*]* Special offers on Oracle products, services and training
[*]* Access to early releases and documentation
[*]
[*]Product and system data will be collected. If your configuration
[*]supports a browser, the JDK Product Registration form will
[*]be presented. If you do not register, none of this information
[*]will be saved. You may also register your JDK later by
[*]opening the register.html file (located in the JDK installation
[*]directory) in a browser.
[*]
[*]For more information on what data Registration collects and
[*]how it is managed and used, see:
[*]http://java.sun.com/javase/registration/JDKRegistrationPrivacy.html
[*]
[*]Press Enter to continue.....
[*]
[*]Done.
5.验证安装是否成功（好吧，显示还是系统自带的jdk，有些软件识别不到系统的，所有有时自己安装还是很有必要的）
[*]# java -version
[*]java version "1.4.2"
[*]gij (GNU libgcj) version 4.1.2 20080704 (Red Hat 4.1.2-46)
[*]
[*]Copyright (C) 2006 Free Software Foundation, Inc.
[*]This is free software; see the source for copying conditions.There is NO
[*]warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
6.配置环境变量
系统默认把jdk安装到 /usr/java/jdk1.6.0_29 目录下（找了N次，还是没找到如何把jdk安装到自己指定的目录下）
[*]# vi /etc/profile
在文件的末尾添加
[*]#set Java Environment
[*]export JAVA_HOME=/usr/java/jdk1.6.0_29
[*]export PATH=$JAVA_HOME/bin:$PATH
[*]export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
执行命令（立即生效命令，否则重启后生效）
[*]# source /etc/profile
检验成功与否
[*]# java -version
[*]java version "1.6.0_29"
[*]Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
[*]Java HotSpot(TM) Client VM (build 20.4-b02, mixed mode, sharing)
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