查看已安装的java

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[root@s0 Soft]# rpm -qa | grep java

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tzdata-java-2013c-1.el6.noarch

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java-1.6.0-openjdk-1.6.0.0-1.61.1.11.11.el6_4.x86_64

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java-1.7.0-openjdk-1.7.0.19-2.3.9.1.el6_4.x86_64

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libreoffice-javafilter-3.4.5.2-16.1.el6_3.x86_64

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java_cup-0.10k-5.el6.x86_64

删除已安装的

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[root@s0 Soft]# rpm -e --nodeps tzdata-java-2013c-1.el6.noarch java-1.6.0-openjdk-1.6.0.0-1.61.1.11.11.el6_4.x86_64 java-1.7.0-openjdk-1.7.0.19-2.3.9.1.el6_4.x86_64 libreoffice-javafilter-3.4.5.2-16.1.el6_3.x86_64 java_cup-0.10k-5.el6.x86_64

下载并安装新的JDK（注：axel是个多线程软件）

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[root@s0 Soft]#axel http://download.oracle.com/otn-pub/java/jdk/8-b132/jdk-8-linux-x64.rpm?AuthParam=1395380626_675b0c9264d67806a907228a7af4de9f

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[0%]  .......... .......... .......... .......... ..........  [ 0.9MB/s]

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[100%]  .......... .......... .......... .......... ..........  [ 28.9MB/s]

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[100%]  .......... ......

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Downloaded 133.9 megabytes in 01:03 seconds. (28.92 MB/s)

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[root@s0 Soft]# rpm -ivch jdk-8-linux-x64.rpm

验证安装

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[root@s0 Soft]# java -version

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java version "1.8.0"

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Java(TM) SE Runtime Environment (build 1.8.0-b132)

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Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)

配置环境变量(在/etc/profile中追加)

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[root@s0 Soft]# vim + /etc/profile

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JAVA_HOME=/usr/java/jdk1.8.0

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JRE_HOME=/usr/java/jdk1.8.0/jre

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PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

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CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib

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export JAVA_HOME JRE_HOME PATH CLASSPATH

使环境变量立即生效

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[root@s0 Soft]# source /etc/profile

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[root@s0 Soft]# echo $PATH

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/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/go/bin:/root/bin:/usr/local/go/bin:/usr/java/jdk1.8.0/bin:/usr/java/jdk1.8.0/jre/bin

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[root@s0 Soft]# echo $JAVA_HOME

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/usr/java/jdk1.8.0

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[root@s0 Soft]#