jdk1.6安装及下载

jdk下载：
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "https://download.oracle.com/otn/java/jdk/6u45-b06/jdk-6u45-linux-x64-rpm.bin"
chmod 775 jdk-6u45-linux-x64.bin

./jdk-6u45-linux-x64.bin

java --version

查看java安装地址
whereis java

修改环境变量：
JAVA_HOME=/usr/java/jdk1.6.0_45
JRE_HOME=/usr/java/jdk1.6.0_45/jre
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib/tools.jar
PATH=$JAVA_HOME/bin:$PATH
export PATH JAVA_HOME CLASSPATH