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Environment
Linux version: CentOS 6.5, Ubuntu 12.04.5
JDK version: JDK 1.7
Directory
Method one: Manually unzip the JDK package and then set the environment variables
Method two: Install JDK using yum
Method three: Install JDK using rpm
Method four: Use apt on Ubuntu-get install JDK
Content
Method one:Manually unzip the JDK package and then set the environment variables
1. In/usr/Create a java directory under the directory
[root@localhost ~]# mkdir/usr/java [root@localhost ~]# cd /usr/java
2. Download and then unzip
[root@localhost java]# curl -O http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz [root@localhost java]# tar -zxvf jdk-7u79-linux-x64.tar.gz
3.Set environment variables
[root@localhost java]# vi /etc/profile
Add the following content:
#set java environment JAVA_HOME=/usr/java/jdk1.7.0_79 JRE_HOME=/usr/java/jdk1.7.0_79/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH
To make the changes take effect:
[root@localhost java]# source /etc/profile
4.Verification
[root@localhost java]# 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)
Method two:Method to install JDK (CentOS)
1. View all JDK versions in the yum repository
[root@localhost ~]# yum search java|grep jdk ldapjdk-javadoc.x86_64 : Javadoc for ldapjdk java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle ldapjdk.x86_64 : The Mozilla LDAP Java SDK
2. Select the version to install, we install1.7Version
[root@localhost ~]# yum install java-1.7.0-openjdk
After installation, the default installation directory is: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
3.Set environment variables
[root@localhost ~]# vi /etc/profile
Add the following content:
#set java environment JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64 JRE_HOME=$JAVA_HOME/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH
To make the changes take effect:
[root@localhost java]# source /etc/profile
3. Verification: As above.
Note: Since JDK is installed using yum, the system considers the issue of multiple versions and uses alternatives for version control. Initially, the corresponding version of JDK is installed in/usr/lib/jvm/will be generated under the alternatives directory, and then registered in alternatives./etc/After that, some links to/usr/lib/jvm/the newly installed JDK version just now.
in/usr/There will be a link to/etc/The corresponding files of alternatives. For example:/usr/There will be a link file under bin mapping to java as follows:
/usr/bin/java->/etc/alternatives/java /etc/alternatives/java-> /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
In this way, the java command can run normally without setting environment variables. However, for tomcat or other software, environment variables still need to be set.
Similarly, if a new version of JDK is installed, it will link to the latest installed JDK version. Of course, you can also use alternatives to modify the version to be used.
The specific method can be referred to in: 'Using Linux alternatives to manage multiple versions of software'
Method three:Method to install JDK using rpm
1.Download
[hadoop@localhost ~]$ curl -O http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm
2.Install JDK using the rpm command
[root@localhost ~]# 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...
3.Set environment variables
[root@localhost java]# vi /etc/profile
Add the following content:
#set java environment JAVA_HOME=/usr/java/jdk1.7.0_79 JRE_HOME=/usr/java/jdk1.7.0_79/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH
To make the changes take effect:
[root@localhost java]# source /etc/profile
4.Verification
[root@localhost java]# 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)
Similar to yum installation, there is no need to set environment variables to run the java command. The rpm installation method defaults to installing JDK to/usr/java/jdk1.7.0_79Then, through three-level links, it links to/usr/bin, the specific link is as follows:
[root@localhost ~]# cd /bin [root@localhost bin]# ll|grep java lrwxrwxrwx. 1 root root 25 Mar 28 11:24 jar ->/usr/java/default/bin/jar lrwxrwxrwx. 1 root root 26 Mar 28 11:24 java -> /usr/java/default/bin/java lrwxrwxrwx. 1 root root 27 Mar 28 11:24 javac ->/usr/java/default/bin/javac lrwxrwxrwx. 1 root root 29 Mar 28 11:24 javadoc ->/usr/java/default/bin/javadoc lrwxrwxrwx. 1 root root 28 Mar 28 11:24 javaws ->/usr/java/default/bin/javaws lrwxrwxrwx. 1 root root 30 Mar 28 11:24 jcontrol ->/usr/java/default/bin/jcontrol [root@localhost bin]# cd /usr/java/ [root@localhost java]# ll total 4 lrwxrwxrwx. 1 root root 16 Mar 28 11:24 default-> /usr/java/latest drwxr-xr-x. 8 root root 4096 Mar 28 11:24 jdk1.7.0_79 lrwxrwxrwx. 1 root root 21 Mar 28 11:24 latest -> /usr/java/jdk1.7.0_79
Method four:Using apt on Ubuntu-get install JDK
1.View the versions of JDK in apt repository
root@Itble:~# apt-cache search java|grep jdk default-jdk - Standard Java or Java compatible Development Kit default-jdk-doc - Standard Java or Java compatible Development Kit (documentation) gcj-4.6-jdk - gcj and classpath development tools for Java(TM) gcj-jdk - gcj and classpath development tools for Java(TM) openjdk-6-dbg - Java runtime based on OpenJDK (debugging symbols) openjdk-6-demo - Java runtime based on OpenJDK (demos and examples) openjdk-6-doc - OpenJDK Development Kit (JDK) documentation openjdk-6-jdk - OpenJDK Development Kit (JDK) openjdk-6-jre-lib - OpenJDK Java runtime (architecture independent libraries) openjdk-6-source - OpenJDK Development Kit (JDK) source files openjdk-7-dbg - Java runtime based on OpenJDK (debugging symbols) openjdk-7-demo - Java runtime based on OpenJDK (demos and examples) openjdk-7-doc - OpenJDK Development Kit (JDK) documentation openjdk-7-jdk - OpenJDK Development Kit (JDK) openjdk-7-source - OpenJDK Development Kit (JDK) source files uwsgi-plugin-jvm-openjdk-6 - Java plugin for uWSGI (OpenJDK) 6) uwsgi-plugin-jwsgi-openjdk-6 - JWSGI plugin for uWSGI (OpenJDK) 6) openjdk-6-jre - OpenJDK Java runtime, using Hotspot JIT openjdk-6-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless) openjdk-7-jre - OpenJDK Java runtime, using Hotspot JIT openjdk-7-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless) openjdk-7-jre-lib - OpenJDK Java runtime (architecture independent libraries)
2.Select the version to install
root@Itble:~# apt-get install openjdk-7-jdk
3.Set environment variables
root@Itble:~# vi /etc/profile
Add the following content:
#set java environment JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-amd64 JRE_HOME=$JAVA_HOME/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH
To make the changes take effect:
root@Itble:~# source /etc/profile
4.Verification
root@Itble:~# java -version java version "1.7.0_79" OpenJDK Runtime Environment (IcedTea 2.5.5) (7u79-2.5.5-0ubuntu0.12.04.1) OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)
Ubuntu's apt-The installation method of get is very similar to the yum installation method of CentOS, so I won't go into detail here.
That's all for this article, I hope it will be helpful to everyone's learning, and I also hope everyone will support the Yelling Tutorial more.
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