Linux安装JAVA JDK

1. 作者QQ：67065435 QQ群：821635552

安装JAVA_JDK准备

1. 检查是否安装JDK

   rpm -qa|grep -E '^open[jre|jdk]|j[re|dk]'
   

2. 卸载已安装JDK

   rpm -qa|grep Java|xargs rpm -e --nodeps
   

YUM安装JAVA_JDK

1. yum安装jdk

   yum search java|grep jdk
   yum install java-1.8.0-openjdk
   

2. 环境变量配置

   vim /etc/profile
   
   export JRE_HOME=$JRE_HOME:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64/jre
   export JAVA_HOME=$JAVA_HOME:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64
   export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/lib
   export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
   
   ESC
   :wq
   

3. 检查安装是否成功

   java -version
   
   java version "1.8.0_101"
   Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
   Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
   

源码安装JAVA_JDK

1. 命令行下载 JDK8

   cd /root
   wget --no-check-certificate --no-cookies \
   --header "Cookie:oraclelicense=accept-securebackup-cookie" \
   http://download.oracle.com/otn-pub/java/jdk/8u131-b13/jdk-8u131-linux-x64.tar.gz
   

2. 解压并配置环境变量

   tar -zxvf jdk-8u131-linux-x64.tar.gz
   mv /root/jdk1.8.0_101 /usr/local/jdk
   
   vim /etc/profile
   
   export JAVA_HOME=$JAVA_HOME:/usr/local/jdk
   export JRE_HOME=$JRE_HOME:/usr/local/jdk/jre
   export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/lib
   export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
   
   ESC
   :wq
   
   source /etc/profile
   

3. 检查安装是否成功

   java -version
   
   java version "1.8.0_101"
   Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
   Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)