centos配置jdk

########## config jdk ##########

export JAVA_HOME=/usr/local/java/jdk1.7.0_79

export CLASSPATH=.:${JAVA_HOME}/lib:${JAVA_HOME}/jre/lib

export PATH=${JAVA_HOME}/bin:$PATH

########## config hadoop ##########

export HADOOP_HOME=/usr/hadoop/hadoop-2.7.3

export PATH=$HADOOP_HOME/bin:$PATH

lxw@19:08:51:~$ which javac

/home/lxw/Downloads/jdk1.8.0/bin//javac

lxw@19:08:54:~$ which java

/usr/bin/java

lxw@19:12:11:~$ echo $PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/lxw/Downloads/jdk1.8.0/bin/