CentOS7.0安装JDK1.8.0_31

CentOS7.0安装JDK1.8.0_31

1.检查一下系统中的jdk版本

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$>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.检测JDK安装包

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$>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.卸载OpenJDK

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$>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.安装新的Jdk1.8.0_31

解压缩tar.gz

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$>mkdir -p /usr/lib/jvm

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

5.设置环境变量

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$> vi /etc/profile

在最后添加：

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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.执行profile

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$>source /etc/profile

7.检查新安装的jdk

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$>java -version