linux快速安装jdk1.8方式及环境变量配置

野性酷女 2023-07-06 13:23 15阅读 0赞

## linux快速安装jdk1.8方式及环境配置 ##

**一、下载jdk**  
jdk下载地址：[https://www.oracle.com/java/technologies/javase-jdk8-downloads.html][https_www.oracle.com_java_technologies_javase-jdk8-downloads.html]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lUX01hTm9uZ2tpbmc_size_16_color_FFFFFF_t_70]  
\*\*注：安装之前先查看一下系统有没有已经安装的版本  
查看当前系统jdk的版本：`java -version`  
如果有先卸载,查看jdk目录文件`yum list installed | grep java`  
卸载：`yum -y remove java-1.7.0-openjdk***`  
**- 安装（将下载的压缩文件解压然后配置环境变量）**  
进入linux创建Java文件`mkdir /usr/java`

[root@zyq /]# mkdir /usr/java
    [root@zyq /]# cd /usr/java/

将下载好的压缩文件上传至Java文件使用命令`rz`

[root@zyq java]# rz //选在下载到本地的 jdk-8u241-linux-arm64-vfp-hflt.tar.gz

解压压缩文件 `tar -zxvf jdk-8u241-linux-arm64-vfp-hflt.tar.gz`

[root@zyq java]# ll
    总用量 169224
    -rw-r--r--. 1 root root 173281904 12月 23 2018 jdk-8u51-linux-x64.tar.gz
    [root@zyq java]# tar -zxvf jdk-8u241-linux-arm64-vfp-hflt.tar.gz
    ......
    [root@zyq java]# ls
    jdk1.8.0_51  jdk-8u51-linux-x64.tar.gz
    [root@zyq java]#

解压成功（表示JDK已安装成功，可查看jdk的文件夹）  
但此时java -version命令还不能使用：还需要配置环境变量

**配置环境变量**

**- 使用`vim /etc/profile` 编辑profile文件**

[root@zyq /]# vim /etc/profile
    # /etc/profile
    
    # System wide environment and startup programs, for login setup
    # Functions and aliases go in /etc/bashrc
    
    # It's NOT a good idea to change this file unless you know what you
    # are doing. It's much better to create a custom.sh shell script in
    # /etc/profile.d/ to make custom changes to your environment, as this
    # will prevent the need for merging in future updates.
    
    pathmunge () { 
        case ":${PATH}:" in
            *:"$1":*)
                ;;
            *)
                if [ "$2" = "after" ] ; then
                    PATH=$PATH:$1
                else
                    PATH=$1:$PATH
                fi
        esac
    }
    ......

向文件里面追加以下内容：

#set java environment
    JAVA_HOME=/usr/java/jdk1.8.0_51          
    JRE_HOME=$JAVA_HOME/jre
    PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
    CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
    export JAVA_HOME JRE_HOME PATH CLASSPATH

*  使配置文件生效：`source /etc/profile`

[root@zyq /]# source /etc/profile

验证是否安装成功

[root@zyq /]# java -version
    openjdk version "1.8.0_242"
    OpenJDK Runtime Environment (build 1.8.0_242-b08)
    OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode)
    [root@zyq /]#

*本人是在虚拟机CentOs 7 安装测试。其实安装jdk还有多种方式，docker 安装。rpm 方式安装等！*

[https_www.oracle.com_java_technologies_javase-jdk8-downloads.html]: https://www.oracle.com/java/technologies/javase-jdk8-downloads.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lUX01hTm9uZ2tpbmc_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200219134907212.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2lUX01hTm9uZ2tpbmc=,size_16,color_FFFFFF,t_70