centos7 下安装jdk8 -小白教程

电玩女神 2022-01-16 01:51 489阅读 0赞

**目录**

下载jdk和安装

修改环境变量

完整命令：

--------------------

## 下载jdk和安装 ##

首先，去oracle官网下载jdk8的安装包，记得下载以tar.gz结尾的。附官网地址：

[https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html][https_www.oracle.com_technetwork_java_javase_downloads_jdk8-downloads-2133151.html]

切换目录到  cd /usr/local

创建目录 mkdir jvm

使用Xshell和Xftp将安装包传输到虚拟机的 /usr/local/jvm目录下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lpaWlpaWxpa2FuZ3NodWFp_size_16_color_FFFFFF_t_70][]

切换到/usr/local/jvm目录下   cd /usr/local/jvm

解压安装包    tar -zxvf jdk-8u212-linux-x64.tar.gz

删除安装包  rm -f jdk-8u212-linux-x64.tar.gz

到此为止，便是安装好了，接下来修改环境变量。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lpaWlpaWxpa2FuZ3NodWFp_size_16_color_FFFFFF_t_70 1][]

## 修改环境变量 ##

vim  /etc/profile

<table> 
 <tbody> 
  <tr> 
   <td> <p>export JAVA_HOME=/usr/local/jvm/jdk1.8.0_152</p> <p>export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar</p> <p>export PATH=$PATH:$JAVA_HOME/bin</p> </td> 
  </tr> 
 </tbody> 
</table>

JAVA\_HOME  为jdk1.8.0\_212的安装目录。或用pwd查看。

CLASSPATH 为jdk函数库目录

PATH 为启动目录

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lpaWlpaWxpa2FuZ3NodWFp_size_16_color_FFFFFF_t_70 2][]

修改后 按EXC, 输入:wq    即保存退出

重启环境  生效命令  source /etc/profile

再检验jdk8是否安装成功    java -version   出现如图便为成功安装。

![20190613203119371.png][]

## 完整命令： ##

\[root@localhost jvm\]\# tar -zxvf jdk-8u212-linux-x64.tar.gz

\[root@localhost jvm\]\# rm -f jdk-8u212-linux-x64.tar.gz

\[root@localhost jvm\]\# ls  
jdk1.8.0\_212  jdk-8u212-linux-x64.tar.gz  
\[root@localhost jvm\]\# rm -f jdk-8u212-linux-x64.tar.gz   
\[root@localhost jvm\]\# ls  
jdk1.8.0\_212  
\[root@localhost jvm\]\# vim /etc/profile  
\[root@localhost jvm\]\# source /etc/profile  
\[root@localhost jvm\]\# java -version

[https_www.oracle.com_technetwork_java_javase_downloads_jdk8-downloads-2133151.html]: https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lpaWlpaWxpa2FuZ3NodWFp_size_16_color_FFFFFF_t_70 1]: /images/20220115/8b40310344624af2808a7d68374152ee.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lpaWlpaWxpa2FuZ3NodWFp_size_16_color_FFFFFF_t_70 2]: /images/20220115/7782f00f997942e2b951ba985e30c53f.png
[20190613203119371.png]: /images/20220115/788cb32359c04dbe88136b2a9ea5ce28.png