Jdk1.7在linux下安装步骤

http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html
#rpm -ivh jdk-7u45-linux-i586.rpm(当前最新版)
#vi /etc/profile
修改里面JAVA_HOME=/usr/java/jdk1.7.0_45
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME
export PATH
export CLASSPATH
source /etc/profile
保存，退出。
#java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) Server VM (build 24.45-b08, mixed mode)显示这样的信息，表示安装成功。