一、jdk的安裝包(.tar.gz)拷貝到/opt目錄下java
mv jdk-8u144-linux-x64.tar.gz /opt
二、解壓文件linux
tar -zvxf jdk-8u144-linux-x64.tar.gz
三、添加環境變量
vim /etc/profileubuntu
# set java environment export JAVA_HOME=/opt/jdk1.8.0_144 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH
四、配置默認JDK版本vim
update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_144/bin/java 300 update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_144/bin/javac 300 update-alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_144/bin/jar 300 update-alternatives --install /usr/bin/javah javah /opt/jdk1.8.0_144/bin/javah 300 update-alternatives --install /usr/bin/javap javap /opt/jdk1.8.0_144/bin/javap 300
PS: 以上命令均在管理員權限下運行。
PPS:在安裝、運行hadoop時,${JAVA_HOME}依然爲空,須要執行 sources /etc/profile
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