a、下载系统相应的安装包
jdk-7u79-linux-x64.rpm
b、检验系统原版本
[root@localhost ~]# java -version java version "1.6.0_24" 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)
c、进一步查看JDK信息
[root@localhost ~]# rpm -qa | grep java tzdata-java-2012c-1.el6.noarch java-1.6.0-openjdk-1.6.0.0-1.45.1.11.1.el6.x86_64
d、卸载OpenJDK
[root@localhost ~]# rpm -e --nodeps tzdata-java-2012c-1.el6.noarch [root@localhost ~]# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.45.1.11.1.el6.x86_64
e、安装JDK
[root@locahost rpm]# rpm -ivh jdk-7u79-linux-x64.rpm
JDK默认安装到/usr/java
f、验证安装
[root@localhost usr]# java -version java version "1.7.0_79" Java(TM) SE Runtime Environment (build 1.7.0_79-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode) 出现上述信息，则安装成功
g、配置环境变量
[root@localhost rpm]# vi + /etc/profile #向文件里面追加以下内容： JAVA_HOME=/usr/java/jdk1.7.0_79 JRE_HOME=/usr/java/jdk1.7.0_79/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
h、设置配置立即生效
[root@linuxidc local]# source /etc/profile
i、查看系统环境状态
[root@localhost usr]# echo $PATH /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/java/jdk1.7.0_79/bin:/usr/java/jdk1.7.0_79/jre/bin
至此jdk安装完毕
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