vim /etc/profile

export JAVA_HOME=/usr/local/jdk1.8
export NGINX_HOME=/usr/local/nginx
export PATH=$PATH:$NGINX_HOME/sbin:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar