在CentOS 7中安裝與配置JDK8

標籤：

1. 檢查已經安裝的jdk

rpm -qa | grep java

可能的結果如下:

java-1.7.0-openjdk-1.7.0.99-2.6.5.0.el7_2.x86_64python-javapackages-3.4.1-11.el7.noarchjava-1.8.0-openjdk-headless-1.8.0.77-0.b03.el7_2.x86_64java-1.8.0-openjdk-1.8.0.77-0.b03.el7_2.x86_64tzdata-java-2016c-1.el7.noarchjavapackages-tools-3.4.1-11.el7.noarchjava-1.7.0-openjdk-headless-1.7.0.99-2.6.5.0.el7_2.x86_64

2. 移除已經安裝的open-jdk及依賴的程式

yum remove tzdata-java-2016c-1.el7.noarch

此時所有的open-jdk和其它對open-jdk有依賴的軟體都會被移除

 

3.到oracle下載jdk8, 如我下載的是jdk-8u65-linux-x64.rpm

在對應目錄下執行安裝命令:

rpm -ivh jdk-8u65-linux-x64.rpm

程式預設安裝到 /usr/java/jdk1.8.0_65

檢查安裝情況:

[[email protected] jdk]# java -versionjava version "1.8.0_65"Java(TM) SE Runtime Environment (build 1.8.0_65-b17)Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)[[email protected] jdk]# javac -versionjavac 1.8.0_65

檢查檔案路徑:

[[email protected] jdk]# whereis javajava: /usr/bin/java /usr/lib/java /etc/java /usr/share/java /usr/share/man/man1/java.1[[email protected] jdk]# ll /usr/bin/javalrwxrwxrwx 1 root root 22 Mar 28 11:52 /usr/bin/java -> /etc/alternatives/java[[email protected] jdk]# ll /etc/alternatives/javalrwxrwxrwx 1 root root 34 Mar 28 11:52 /etc/alternatives/java -> /usr/java/jdk1.8.0_65/jre/bin/java

添加環境變數檔案:

[[email protected] jdk]# vi /etc/profile.d/jdk8.sh

添加以下內容

JAVA_HOME=/usr/java/jdk1.8.0_65JRE_HOME=/usr/java/jdk1.8.0_65/jreCLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/libexport JAVA_HOME JRE_HOME CLASSPATH

使修改生效

source /etc/profile

檢查是否生效

[[email protected] jdk]# env|grep javaJRE_HOME=/usr/java/jdk1.8.0_65/jreJAVA_HOME=/usr/java/jdk1.8.0_65CLASSPATH=.:/usr/java/jdk1.8.0_65/lib/dt.jar:/usr/java/jdk1.8.0_65/lib/tools.jar:/usr/java/jdk1.8.0_65/jre/lib

 

到此OK了.

在CentOS 7中安裝與配置JDK8