Linux 下CentOS安装JDK8教程实例



Linux 下CentOS安装JDK8教程实例。概述

记录CentOS安装JDK8的过程。

 

软件环境

CentOS:6.5,x86-64位版本

JDK: 8.0,x86-64位版本,rpm格式

 

安装

首先切换到root:

“`

su – root

“`

然后安装jdk:

“`

rpm -ivh jdk-8-linux-x64.rpm

 

Preparing…                ########################################### [100%]    1:jdk                    ########################################### [100%] Unpacking JAR files… rt.jar… Error: Could not open input file: /usr/java/jdk1.8.0/jre/lib/rt.pack Error: unpack could not create JAR file:

/usr/java/jdk1.8.0/jre/lib/rt.jar

Please refer to the Troubleshooting section of the Installation Instructions on the download page. jsse.jar… Error: Could not open input file: /usr/java/jdk1.8.0/jre/lib/jsse.pack Error: unpack could not create JAR file:

/usr/java/jdk1.8.0/jre/lib/jsse.jar

Please refer to the Troubleshooting section of the Installation Instructions on the download page. charsets.jar… Error: Could not open input file: /usr/java/jdk1.8.0/jre/lib/charsets.pack Error: unpack could not create JAR file:

/usr/java/jdk1.8.0/jre/lib/charsets.jar

Please refer to the Troubleshooting section of the Installation Instructions on the download page. tools.jar… Error: Could not open input file: /usr/java/jdk1.8.0/lib/tools.pack Error: unpack could not create JAR file:

/usr/java/jdk1.8.0/lib/tools.jar


Please refer to the Troubleshooting section of the Installation Instructions on the download page. localedata.jar… Error: Could not open input file: /usr/java/jdk1.8.0/jre/lib/ext/localedata.pack Error: unpack could not create JAR file:

/usr/java/jdk1.8.0/jre/lib/ext/localedata.jar

Please refer to the Troubleshooting section of the Installation Instructions on the download page. jfxrt.jar… Error: Could not open input file: /usr/java/jdk1.8.0/jre/lib/ext/jfxrt.pack Error: unpack could not create JAR file:

/usr/java/jdk1.8.0/jre/lib/ext/jfxrt.jar

Please refer to the Troubleshooting section of the Installation Instructions on the download page.

“`

出现上面的错误是因为系统中已经有JDK的其他版本,使用`rpm -qa | grep jdk`查询存在的jdk,并用`rpm -e`命令移除。之后再次执行安装,顺利通过

“`

Preparing…                ########################################### [100%]    1:jdk                    ########################################### [100%] Unpacking JAR files… rt.jar… jsse.jar… charsets.jar… tools.jar… localedata.jar… jfxrt.jar…

“`

 

配置环境变量

编辑环境变量,配置path和classpath。vi /etc/profile,增加下面配置:

“`

export JAVA_HOME=/usr/java/jdk1.8.0/ export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin

“`

保存退出后,执行`source /etc/profile`使变更生效。

 

检测安装的是否正确,在shell中执行`java -version`和`javac -version`,如果shell显示如下的信息,表示安装成功:

“`

[root@localhost Downloads]# java -version java version “1.8.0″ Java(TM) SE Runtime Environment (build 1.8.0-b132) Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode) [root@localhost Downloads]# javac -version javac 1.8.0

“`