查看linux版本
该机器为64位操作系统，下载64位jdk，jdk-6u45-linux-x64.bin
[root@was01 ~]# uname -a
Linux was01 3.10.0-514.el7.x86_64 #1 SMP Wed Oct 19 11:24:13 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux
下载地址：
https://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase6-419409.html
安装jdk
把jdk-6u45-linux-x64.bin上传到：/usr/local/src
赋予执行权限
[root@was01 src]# chmod +x jdk-6u45-linux-x64.bin
运行jdk-6u45-linux-x64.bin，程序会在当前目录解压出jdk文件，把jdk1.6.0_45移动到/usr/java/jdk6
进入jdk的bin目录查看版本
[root@was01 src]# ./jdk-6u45-linux-x64.bin
[root@was01 src]# ls jdk1.6.0_45/
bin COPYRIGHT db include jre lib LICENSE man README.html src.zip THIRDPARTYLICENSEREADME.txt
[root@was01 src]# mv jdk1.6.0_45/ /usr/java/jdk6
[root@was01 src]# cd /usr/java/jdk6/bin/
[root@was01 bin]# ./java -version
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)
配置环境变量
编辑 /etc/profile 在最后一行添加
JAVA_HOME=/usr/java/jdk6
CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
PATH=$JAVA_HOME/bin:$PATH
执行 source /etc/profile 是配置立即生效
