Install java1.8 on centos7

Installation method: rpm installation, because some machines may not connect to the Internet, so the unified use of rpm installation software: jdk-8u45-linux-x64.rpm: http://www.oracle.com/technetwork/java/javase/downloads/index.html?javainformation =root@zck#] # Java-versionjavav installation method: rpm installation, because some machines may not be connected to the Internet, so the rpm installation is uniform
Software: jdk-8u45-linux-x64.rpm

: Http://www.oracle.com/technetwork/java/javase/downloads/index.html

 

View built-in java information
[Root @ zck ~] # 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 between 0-b12, mixed mode)

To further view the 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

Uninstall OpenJDK and perform the following operations:
[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 new jdk-8u45-linux-x64.rpm software to/usr/local/to perform the following operations:

[Root @ localhost ~] # Cd/usr/local/

[Root @ localhost local] # rpm-ivh jdk-8u45-linux-x64.rpm

JDK is installed in/usr/java by default.

 

Perform the following operations to check whether the information is normal:
[Root @ localhost ~] # Java
[Root @ localhost ~] # Javac
[Root @ localhost ~] # Java-version