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  • CentOS下安装JDK的三种方法

    CentOS下安装JDK的三种方法

    由于各Linux开发厂商的不同,因此不同开发厂商的Linux版本操作细节也不一样,今天就来说一下CentOS下JDK的安装:

    方法一：手动解压JDK的压缩包，然后设置环境变量

    1.在/usr/目录下创建java目录

    [root@localhost ~]# mkdir/usr/java
    [root@localhost ~]# cd /usr/java

    2.下载jdk,然后解压

    [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.设置环境变量

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

    在profile中添加如下内容:

    #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

    让修改生效:

    [root@localhost java]# source /etc/profile

    4.验证JDK有效性

    [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)

    方法二：用yum安装JDK

    1.查看yum库中都有哪些jdk版本(暂时只发现了openjdk)

    [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.选择版本,进行安装

    //选择1.7版本进行安装
    [root@localhost ~]# yum install java-1.7.0-openjdk
    //安装完之后，默认的安装目录是在: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64

    3.设置环境变量

    [root@localhost ~]# vi /etc/profile

    在profile文件中添加如下内容

    #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

    让修改生效

    [root@localhost java]# source /etc/profile

    4.验证(同上一方法)

    方法三：用rpm安装JDK

    1.下载rpm安装文件

    [root@localhost ~]$ curl -O http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm

    2.使用rpm命令安装

    [root@localhost  ~]# rpm -ivh jdk-7u79-linux-x64.rpm

    3.设置环境变量

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

    在打开的profile文件中添加如下内容

    #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

    让修改生效

    [root@localhost java]# source /etc/profile

    4.验证(同上一方法)

    注:和yum安装类似，不用设置环境变量就可以运行java命令。rpm安装方式默认会把jdk安装到/usr/java/jdk1.7.0_79，然后通过三层链接，链接到/usr/bin,具体链接如下：

    [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

    方法四：Ubuntu 上使用apt-get安装JDK

    1.查看apt库都有哪些jdk版本

    root@linuxidc:~# 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.选择版本进行安装

    root@linuxidc:~# apt-get install openjdk-7-jdk

    3.设置环境变量

    root@linuxidc:~# vi /etc/profile

    在打开的profile文件中添加如下内容

    #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

    让修改生效

    root@linuxidc:~# source /etc/profile

    4.验证(同上一方法)

    Ubuntu 14.04安装JDK1.8.0_25与配置环境变量 http://www.linuxidc.com/Linux/2015-01/112030.htm 

    CentOS 搭建JDK环境  http://www.linuxidc.com/Linux/2015-06/118879.htm 

    Ubuntu 14.04安装JDK1.8.0_25与配置环境变量  http://www.linuxidc.com/Linux/2015-01/112030.htm 

    Ubuntu 14.04 LTS安装Oracle JDK 1.8  http://www.linuxidc.com/Linux/2014-11/109216.htm 

    CentOS6.3安装JDK和环境配置 http://www.linuxidc.com/Linux/2012-09/70780.htm 

    Ubuntu 14.04 安装 JDK8  http://www.linuxidc.com/Linux/2014-09/106218.htm 

    Ubuntu下安装JDK图文解析 http://www.linuxidc.com/Linux/2014-09/107291.htm 

    本文永久更新链接地址：http://www.linuxidc.com/Linux/2016-09/134941.htm
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  • 原文地址：https://www.cnblogs.com/IT-study/p/9010534.html
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