CentOS 6.8 Installation JDK1.7

Check to see if the Linux system has JDK installed

[root@linux1 ~]# rpm-qa | grep java

tzdata-java-2016c-1.el6.noarch

java-1.6.0-openjdk-1.6.0.38-1.13.10.4.el6.x86_64

java-1.7.0-openjdk-1.7.0.99-2.6.5.1.el6.x86_64

Uninstall the system with its own Java

[root@linux3 ~]# rpm-qa | grep java | xargs rpm-e--nodeps

View Uninstall results

[root@linux3 ~]# java-version

bash:/usr/bin/java:no such file or directory

uninstall succeeded

Download links for various historical versions of Java: Http://download.oracle.com/otn/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz? authparam=1521384623_73e629f3cfd12c4b38b8a705405f5974

Download JDK
wget get address, command as follows:

wget--no-check-certificate--no-cookies--header "Cookie:oraclelicense=accept-securebackup-cookie" http:// Download.oracle.com/otn/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz? authparam=1514647148_4deb02bdc334d35818d4a0ba91b4f311

http://www.Oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

jdk-7u79-linux-x64.rpm

Jdk-7u79-linux-x64.tar.gz

The first method: RPM Package Installation

RPM package import user root directory

[root@linux2 ~]# ls

anaconda-ks.cfg  id_dsa.pub  install.log  Install.log.syslog 

jdk-7u79-linux-x64.rpm

granted permission

[root@linux2 ~]# chmod 755

installation

[Root@linux2 ~]# RPM-IVH jdk-7u79-linux-x64.rpm

preparing ...                ########################################### [100%]

1:jdk                    ########################################### [ 100%]

unpacking JAR files ...

Rt.jar ...

Jsse.jar ...

Charsets.jar ...

Tools.jar ...

Localedata.jar ...

Jfxrt.jar ... Installation Complete

The second method: Binary package installation

set up Java_home directory

[root@linux3 ~]# mkdir/usr/java

put binary packages under/usr/java/and unzip

[Root@linux3 ~]# MV Jdk-7u79-linux-x64.tar.gz/usr/java

[root@linux3 ~]# cd/usr/java

[root@linux3 java]# tar xvf jdk-7u79-linux-x64.tar.gz

View Results

[root@linux3 java]# ls

jdk1.7.0_79  jdk-7u79-linux-x64.tar.gz

to save space, you can delete

a binary package [Root@linux3 java]# RM-RF jdk-7u79-linux-x64.tar.gz

Configure the global Java environment variable

[root@linux3 java]# vi/etc/profile

add

export java_home=/usr/java/jdk1.7.0_79

to the last surface Export jre_home= $JAVA _home/jre

export path= $PATH: $JAVA _home/bin

export classpath=./: $JAVA _home/lib:$ Java_home/jre/lib

Save exit to

make profile configuration effective

[Root@linux3 java]# Source/etc/profile

Check the environment variable

[root@linux3 java]# echo $JAVA _home

/usr/java/jdk1.7.0_79

[root@linux3 java]# Echo $CLASSPATH

./:/usr/java/jdk1.7.0_79/lib:/usr/java/jdk1.7.0_79/jre/lib

[Root@linux3 java]# echo $PATH

/usr/local/cmake-2.8.10.2/bin:/usr/local/mysql/bin:/usr/local/mysql/lib:/usr/ local/cmake-2.8.10.2/bin:/usr/local/mysql/bin:/usr/local/mysql/lib:/usr/lib64/qt-3.3/bin:/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/bin

Installation Complete

Finally, test the installed JDK

[Root@linux3 java]# java-version

java Version "1.7.0_79"

Java (TM) SE Runtime Environment (build 1.7.0_79-b15) C11/>java HotSpot (TM) 64-bit Server VM (build 24.79-b02, Mixed mode)

or input Javac