下载jdk

[root@Bhanv ~]# ll jdk/jdk-6u19-linux-i586-rpm.bin

-rwxr--r-- 1 root root 80366029 2010-04-09 jdk/jdk-6u19-linux-i586-rpm.bin

添家权限并安装

[root@Bhanv ~]# chmod o+x jdk/jdk-6u19-linux-i586-rpm.bin

[root@Bhanv ~]# ll jdk/jdk-6u19-linux-i586-rpm.bin

-rwxr--r-x 1 root root 80366029 2010-04-09 jdk/jdk-6u19-linux-i586-rpm.bin

[root@Bhanv ~]# ls jdk-6u19-linux-i586.rpm

jdk-6u19-linux-i586.rpm

[root@Bhanv ~]# rpm -ivh jdk-6u19-linux-i586.rpm

设置环境变量

[root@Bhanv ~]# export JAVA_HOME=/usr/java/jdk1.6.0_19/

[root@Bhanv~]#export CLASSPATH=/usr/java/jdk1.6.0_19/lib/dt.jar:/usr/java/jdk1.6.0_19/lib/tools.jar [root@Bhanvlib]# export CLASSPATH=.:/usr/java/jdk1.6.0_19/lib/dt.jar:/usr/java/jdk1.6.0_19/lib/tools.jar

[root@Bhanv lib]# export PATH=$PATH:/usr/java/jdk1.6.0_19/bin/

[root@Bhanv lib]# java -version

java version "1.6.0_19"

Java(TM) SE Runtime Environment (build 1.6.0_19-b04)

Java HotSpot(TM) Client VM (build 16.2-b04, mixed mode, sharing)

创建测试java文件并编译测试：

[root@Bhanv ~]# cat test.java

class test

{

public static void main(String[] args)

{

System.out.println("Hello World!");

}

}

[root@Bhanv ~]# ll test.java

-rwxr-xr-x 1 root root 97 04-09 09:39 test.java

[root@Bhanv ~]# javac test.java

[root@Bhanv ~]# java test

Hello World!

刚才的设置只对当前登陆shell有效,用户注销就没有，可以写在用户的.bashrc中，如下

[root@Bhanv ~]#vi .bashrc

set JAVA_HOME=/usr/java/jdk1.6.0_02

export JAVA_HOME

set PATH=$PATH:$JAVA_HOME/bin

export PATH

set CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export CLASSPATH

要想让所有的用户都可以，将以上内容则写在/etc/profile，然后使用以下命令使其立即生效

[root@Bhanv ~]#source /etc/profile　 ← 使环境变量生效