第一步:下載jdk8
jdk下載地址
# 下載需要一些設置,不能直接用wget,速度很慢
# 以目前最新的下載地址爲例
wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u111-b14/jdk-8u111-linux-x64.tar.gz
第二步:解壓文件並配置環境變量
sudo mkdir -p /usr/lib/jvm
sudo tar -zxvf jdk-8u111-linux-x64.tar.gz
sudo mv jdk1.8.0_111/ /usr/lib/jvm
cd /usr/lib/jvm
sudo ln -s jdk1.8.0_111/ jdk8
vi ~/.bashrc
export JAVA_HOME=/usr/lib/jvm/jdk8
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
source ~/.bashrc
第三步:配置默認JDK版本
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk8/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk8/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk8/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/jdk8/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk8/bin/javap 300
sudo update-alternatives --config java
第四步:驗證
java -version
jps