linux jdk靜默安裝

#下載&解壓

mkdir /opt/java/
cd  /opt/java/
wget  http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz
tar xvf jdk-7u79-linux-x64.tar.gz

1.經過軟鏈接

ln -s   /opt/java/jdk1.7.0_79/bin/java /usr/bin/java
ln -s   /opt/java/jdk1.7.0_79/bin/javac /usr/bin/javac
--去掉軟鏈接 rm /usr/bin/java

2.經過配置 /etc/profile 對全部用戶有效

vi /etc/profile
JAVA_HOME=/opt/java/jdk1.7.0_79/
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME
export PATH
export CLASSPATH

3.修改~/.bashrc文件（該方法修改後只對當前用戶有效，對該用戶的全部shell都有效）

vi  ~/.bashrc
JAVA_HOME=/opt/java/jdk1.7.0_79/
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME
export PATH
export CLASSPATH