linux安装jdk
export JAVA_HOME=/usr/local/jdk1.8
export JAVA_BIN=/usr/local/jdk1.8/bin
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME JAVA_BIN PATH CLASSPATH
export JAVA_HOME=/usr/local/jdk1.8
export JAVA_BIN=/usr/local/jdk1.8/bin
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME JAVA_BIN PATH CLASSPATH