一般安装JDK JAVA环境有2种方式,下面我逐个说明。
生产环境:
$ hostnamectl Static hostname: localhost.localdomain Icon name: computer-vm Chassis: vm Machine ID: 769ef9902d8743958a40cb81db696433 Boot ID: ce70591a91b64e73926682db72441f7b Virtualization: microsoft Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 3.10.0-514.2.2.el7.x86_64 Architecture: x86-64
一、rpm Tool安装方式(相对简单)
1.下载对应的JAVA JDK RPM包 64位:
//www.oracle.com/technetwork/java/javase/downloads/index.html
2.开始安装:
# cd /tmp # rpm -ivh jdk-8u144-linux-x64.rpm Preparing... ################################# [100%] Updating / installing... 1:jdk1.8.0_144-2000:1.8.0_144-fcs ################################# [100%] Unpacking JAR files... tools.jar... plugin.jar... javaws.jar... deploy.jar... rt.jar... jsse.jar... charsets.jar... localedata.jar...
3.RPM包安装完成,验证是否安装成功,如果有输出JDK相关版本说明已经安装成功。
# java -version java version "1.8.0_144" Java(TM) SE Runtime Environment (build 1.8.0_144-b01) Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
4.添加JAVA JDK环境变量:
# vim /etc/profile.d/java.sh JAVA_HOME=/usr/java/jdk1.8.0_144 JRE_HOME=/usr/java/jdk1.8.0_144/jre CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME PATH CLASSPATH
5.永久使环境变量生效:
# source /etc/profile.d/java.sh
RPM安装方式已经完成。
二、JAVA JDK源码Tarball包安装方式(推荐)
1.先卸载之前通过rpm或yum安装的包,如果输出无,说明没安装,反之已安装。
# rpm -qa | grep -E '^open[jre|jdk]|j[re|dk]' libbasicobjects-0.1.1-27.el7.x86_64 openjpeg-libs-1.5.1-16.el7_3.x86_64 gobject-introspection-1.42.0-1.el7.x86_64 openjpeg-1.5.1-16.el7_3.x86_64 jdk1.8.0_131-1.8.0_131-fcs.x86_64 pygobject3-base-3.14.0-3.el7.x86_64 openjpeg-devel-1.5.1-16.el7_3.x86_64
2.卸载已安装的JDK:
# yum -y remove jdk1.8.0_131-1.8.0_131-fcs.x86_64
3.下载对应的JDK版本Tarball包 64位并解压:
//www.oracle.com/technetwork/java/javase/downloads/index.html
# cd /mnt # tar zxvf jdk-8u144-linux-x64.tar.gz # mv jdk-8u144-linux-x64 /usr/local/ # cd /usr/local/ # ln -s jdk-8u144-linux-x64 jdk
4.添加JAVA JDK环境变量:
# vim /etc/profile.d/jdk.sh JAVA_HOME=/usr/local/jdk JRE_HOME=/usr/local/jdk/jre CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME PATH CLASSPATH
5.永久使JAVA JDK环境变量生效:
# source /etc/profile.d/jdk.sh
6.查看JAVA JDK版本输出:
# java -version java version "1.8.0_144" Java(TM) SE Runtime Environment (build 1.8.0_144-b01) Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
7.至此java jdk环境安装配置已经完成。
JAVA JDK JRE环境安装有多种方式,每一种方式都可以使用,找到适合自己的,如果要我推荐,我建议选择Tarball构建。