CentOS安装JDK

1.下载JDK http://www.oracle.com/technetwork/java/javase/downloads/index.html

2.删除系统现有JDK

#rpm -qa | grep java

tzdata-java-2014g-1.el6.noarch
java-1.7.0-openjdk-1.7.0.65-2.5.1.2.el6_5.x86_64
java-1.6.0-openjdk-1.6.0.0-11.1.13.4.el6.x86_64

# rpm -e --nodeps tzdata-java-2014g-1.el6.noarch
# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.65-2.5.1.2.el6_5.x86_64
# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-11.1.13.4.el6.x86_64

3.安装

#mkdir /usr/java

#tar -zxvf jdk-8u111-linux-x64.tar.gz

#mv Downloads/jdk1.8.0_111 /usr/java

4.配置

#vim /etc/profile

JAVA_HOME=/usr/java/jdk1.8.0_111
JRE_HOME=/usr/java/jdk1.8.0_111/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
CLASSPATH=:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
export JAVA_HOME JRE_HOME PATH CLASSPATH

5.检查安装

#java -version

java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)