CentOS7.0安裝JDK1.8

http://www.centoscn.com/image-text/install/2015/0311/4856.html

jdk下載地址：

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

1.檢查一下系統中的jdk版本

$>java -version

java version "1.7.0_"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (rhel-1.45.1.11.1.el6-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

2.檢測JDK安裝包

$>rpm -qa | grep java

avapackages-tools-3.4.1-6.el7_0.noarch
tzdata-java-2014i-1.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64
python-javapackages-3.4.1-6.el7_0.noarch

3.卸載OpenJDK

$>rpm -e --nodeps tzdata-java-2014i-1.el7.noarch
$>rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
$>rpm -e --nodeps java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64

4.安裝新的Jdk1.8.0_31

 解壓縮tar.gz

$>mkdir  -p /usr/lib/jvm
$>tar  -zxvf jdk1.8.0_31.tar.gz -C  /usr/lib/jvm

5.設置環境變量

$> vi    /etc/profile

在最後添加：

export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_31
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export  PATH=${JAVA_HOME}/bin:$PATH

6.執行profile

$>source /etc/profile

7.檢查新安裝的jdk

$>java -version