Environmental preparation
System environment: centos6.5
Installation method: rpm installation
Software: jdk-8u111-linux-x64.rpm
Download address: http://www.oracle.com/technetwork/java/javase/downloads/index.html
下载命令：wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u111-b14/jdk-8u111-linux-x64.rpm
检验系统原版本
[root@localhost ~]# java -version
java version "1.7.0_"
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)
Further view JDK information
[root@localhost ~]# rpm -qa | grep java
javapackages-tools-3.4.1-6.el7_0.noarch
tzdata-java-2014i-1.el7.noarch
java-1.7.0-openjdk-headless -1.7.0.71-2.5.3.1.el7_0.x86_64
java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64
python-javapackages-3.4.1-6.el7_0.noarch
To uninstall OpenJDK, do the following:
[root@localhost ~]# rpm -e --nodeps tzdata-java-2014i-1.el7.noarch
[root@localhost ~]# rpm -e --nodeps java-1.7.0- openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
[root@localhost ~]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64
Install JDK
Upload the new jdk-8u111-linux-x64.rpm software to /usr/local/ and do the following:
[root@localhost]# rpm -ivh jdk-8u111-linux-x64.rpm
The JDK is installed by default in /usr/java.
Verify installation
Do the following to see if the information is normal:
[root@localhost ~]# java
[root@localhost ~]# javac
[root@localhost ~]# java -version
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)
Configure environment variables
Modify the system environment variable file
vi + /etc/profile
向文件里面追加以下内容：
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