安装 jdk 没什么好说的，写这个主要是为了以后方便直接复制命令执行，省得写或者找了

tar xvf jdk-8u102-linux-x64.tar.gzvi /etc/profile...export JAVA_HOME=/var/java/jdk1.8.0_102 export JRE_HOME=/var/java/jdk1.8.0_102/jre export PATH=$PATH:/var/java/jdk1.8.0_102/binexport CLASSPATH=./:/var/java/jdk1.8.0_102/lib:/var/java/jdk1.8.0_102/jre/lib...reboot#检查java -version

22

vi .bashrcJAVA_HOME=/var/java/jdk1.8.0_144PATH=$JAVA_HOME/bin:$PATHCLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jarexport JAVA_HOMEexport PATHexport CLASSPATH...source .bashrc

----------------------------------------------------------

rpm -qa|grep java卸载openjdkrpm -e --nodepsecho -e "export JAVA_HOME=/usr/local/java/jdk1.8.0_144\n\export JRE_HOME=/usr/local/java/jdk1.8.0_144/jre\n\export PATH=\$PATH:/usr/local/java/jdk1.8.0_144/bin\n\export CLASSPATH=./:/usr/local/java/jdk1.8.0_144/lib:/usr/local/java/jdk1.8.0_144/jre/lib" >> /etc/profile.d/java.shsource /etc/profile