ubuntu安装jdk8

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ubuntu安装jdk8
首先新建目录并将下载的jdk-8u111-linux-x64.tar.gz解压到该目录下

sudo mkdir /usr/lib/jvmsudo tar zxvf jdk-8u111-linux-x64.tar.gz -C /usr/lib/jvm 为了方面，将jdk名为为jdk8

修改环境变量

sudo vim /etc/profileexport JAVA_HOME=/usr/lib/jvm/jdk8export JRE_HOME=${JAVA_HOME}/jreexport CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/libexport PATH=${JAVA_HOME}/bin:$PATH

设置系统默认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

然后配置更新

sudo update-alternatives --config java

测试是否安装成功

java -version

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