vi profile 即执行编辑profile文件命令 export JAVA_HOME=/usr/jdk1.7.0_21 export JRE_HOME=/usr/jdk1.7.0_21/jre export PATH=$PATH:/usr/jdk1.7.0_21/bin export CLASSPATH=./:/usr/jdk1.7.0_21/lib:/usr/jdk1.7.0_21/jre/lib