Linux系统CentOS Ubuntu安装JDK的4种方法

梦里梦外; 2022-05-26 03:45 196阅读 0赞

# [CentOS下安装JDK的三种方法][CentOS_JDK] #

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

[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:

![复制代码][copycode.gif]

#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

![复制代码][copycode.gif]

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)

![复制代码][copycode.gif]

[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

![复制代码][copycode.gif]

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

![复制代码][copycode.gif]

#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

![复制代码][copycode.gif]

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

![复制代码][copycode.gif]

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：

![复制代码][copycode.gif]

[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

![复制代码][copycode.gif]

方法四：Ubuntu 上使用apt-get安装JDK

1.查看apt库都有哪些jdk版本

![复制代码][copycode.gif]

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)

![复制代码][copycode.gif]

2.选择版本进行安装

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

3.设置环境变量

root@Itble:~# vi /etc/profile

在打开的profile文件中添加如下内容

![复制代码][copycode.gif]

#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

![复制代码][copycode.gif]

让修改生效

root@Itble:~# source /etc/profile

4.验证(同上一方法)

https://www.cnblogs.com/spiders/archive/2016/09/06/5845727.html

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 <td style="margin:0px;padding:0px;border-width:0px;"> 
 <div style="margin:0px 0px 0px 10px;padding:0px;border:0px;float:right;width:auto;"> 
 </div>这是我们公司在生产环境中的一些安装和配置，供大家一起参考讨论。 ===================================================&nbsp; 1、卸载掉自带的OpenJDK（可以卸载，也可以不卸载，个人建议最好卸载） &nbsp; &nbsp; 查看目前系统的jdk： 　　# rpm -qa | grep jdk 　　java-1.6.0-openjdk-devel-1.6.0.35-1.13.7.1.el6_6.x86_64 　　java-1.6.0-openjdk-javadoc-1.6.0.35-1.13.7.1.el6_6.x86_64 　　java-1.6.0-openjdk-1.6.0.35-1.13.7.1.el6_6.x86_64 　　java-1.7.0-openjdk-1.7.0.79-2.5.5.4.el6.x86_64 　　java-1.7.0-openjdk-devel-1.7.0.79-2.5.5.4.el6.x86_64 　　 　　卸载：（上面不需要的都可以卸载） 　　&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;# yum -y removejava-1.7.0-openjdk-1.7.0.75-2.5.4.0.el6_6.x86_64 2、安装 JDK1.7 &nbsp; &nbsp; 下载Sun的JDK。我下载的是 jdk-7u75-linux-x64.gz，将下载的文件解压到/usr/local目录下&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; # tar zxvf&nbsp;&nbsp;jdk-7u75-linux-x64.gz&nbsp;&nbsp;–C /usr/local &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; 接下来配置JDK： &nbsp; &nbsp;&nbsp;&nbsp;vi /etc/profile打开profile文件，在profile文件的末尾加上： &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; JAVA_HOME=/usr/local/jdk1.7.0_75 &nbsp; &nbsp; PATH=$JAVA_HOME/bin:$PATH &nbsp; &nbsp; CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar &nbsp; &nbsp; export JAVA_HOME &nbsp; &nbsp; export PATH &nbsp; &nbsp; export CLASSPATH&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; 保存并关闭profile文件，执行source/etc/profile命令让修改生效。 &nbsp; &nbsp; 运行下java -version 看一下java版本 ： &nbsp; &nbsp; # java -version &nbsp; &nbsp; java version "jdk1.7.0_75" &nbsp; &nbsp; Java(TM) SE RuntimeEnvironment (build 1.7.0_75-b06) &nbsp; &nbsp; Java HotSpot(TM) ClientVM (build 20.12-b01, mixed mode, sharing) &nbsp; &nbsp;&nbsp; &nbsp;至此，整个JDK安装过程完毕。 &nbsp;&nbsp;</td> 
 </tr> 
 </tbody> 
</table>

https://www.iyunv.com/thread-449805-1-1.html

# [CentOS下用yum命令安装jdk][CentOS_yum_jdk] #

标签： [java][] [CentOS][] [Linux][] [yum][] [jdk][]

2017年02月14日 13:00:40 12585人阅读  评论(3)  收藏  举报

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linux（1）  ![arrow_triangle_20_down.jpg][]

目录[(?)][CentOS_yum_jdk][\[+\]][Link 1]

### 一.使用yum命令安装 ###

#### 1.查看是否已安装JDK,卸载 ####