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CentOS 7下jdk安裝過程，供大家參考，具體內容如下

查看系統版本

									[root@zabbix ~]# cat /etc/redhat-release 

									CentOS Linux release 7.1.1503 (Core) 

									[root@zabbix ~]# uname -a

									Linux zabbix.com 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

下載jdk包，這里我選擇的是oracle的java tar.gz包

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

然后可以用wget 命令下載。如果沒有wget命令的話yum install wget -y

開始安裝jdk，首先解壓

1 2	`tar` `-xf jdk-8u65-linux-x64.gz` `/usr/local/` `ln` `-s` `/usr/local/jdk1.8.0_65` `/usr/local/java/`

添加環境變量

									[root@zabbix ~]#vim /etc/profile.d/java.sh

									JAVA_HOME=/usr/local/java

									JAVA_BIN=$JAVA_HOME/bin

									JRE_HOME=$JAVA_HOME/jre

									JRE_BIN=$JRE_HOME/bin

									CLASSPATH=$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/jre/lib/charsets.jar

									PATH=$PATH:$JAVA_BIN:$JRE_BIN:$CLASSPATH

查看是否安裝成功

									[root@zabbix ~]# java -version

									java version "1.8.0_65"

									Java(TM) SE Runtime Environment (build 1.8.0_65-b17)

									Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)