在centos linux系统中安装jdk1.8

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1. 下载linux版本的jdk
2.  在/usr/local/目录下新建java文件夹

          Mkdir -p  java

      3.将jdk的tar包复制到/usr/local/java 目录下

        ​​​​

 

   4.执行解压命令：

[root@localhost java]# tar -zxvf jdk-8u171-linux-x64.tar.gz

  5.配置环境变量：

export JAVA_HOME=/usr/local/java/jdk1.8.0_171

export JRE_HOME=/usr/local/java/jdk1.8.0_171/jre

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HONE/lib/:$CLASSPATH

export PATH=$JAVA_HOME/bin/:$PATH

6.使其配置生效

 Source /etc/profile

7.验证安装是否成功

[root@localhost java]# java -version

java version "1.8.0_171"

Java(TM) SE Runtime Environment (build 1.8.0_171-b11)

Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)

[root@localhost java]# which java

/usr/local/java/jdk1.8.0_171/bin/java

[root@localhost java]# echo $JAVA_HOME

/usr/local/java/jdk1.8.0_171

[root@localhost java]# vim /etc/profile