Linux上安装JDK详细亲测版

叁歲伎倆 2024-04-17 06:02 17阅读 0赞

## 一:查看JDK ##

参考博客

[https://www.cnblogs.com/Dylansuns/p/6974272.html][https_www.cnblogs.com_Dylansuns_p_6974272.html]

1:java -version 显示当前JDK的版本

![20190825222229944.png][]

2:rpm -qa | grep java 是列出包含samba字段的软件的信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70][]

## 二:JDK的卸载 ##

yum remove \*openjdk\* 一起卸载

![20190825222331449.png][]

逐一的进行卸载

rpm -e --nodeps

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 1][]

3:再次查看,发现成功卸载

![20190825222411722.png][]

## 三:上传JDK ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 2][]

## 四:给jdk进行授权 ##

chmod 777 jdk -R

![201908252224519.png][]

记住:一定要有jdk 这个目录哟

## 五:tar包的安装 ##

1:进行赋权

chmod +x jdk-7u25-linux-x64.tar.gz

![20190825222555179.png][]

2:解压安装

tar -zxvf jdk-7u25-linux-x64.tar.gz

![20190825222614862.png][]

![2019082522262397.png][]

## 六:rpm包的安装 ##

首先将安装包，移动到合适路径，接着给安装包赋予运行权限chmod +x jdk-7u25-linux-x64.rpm，然后运行 rpm -i jdk-7u25-linux-x64.rpm，最后在/etc/profile文件中添加环境变量。

二是GZ是UNIX系统中的压缩文件，ZIP的Gnu版本，功能和WINRAR一样压缩文件的扩展名。

rpm (RedHat Linux Packages Manager)，readhat linux 软件二进制包管理器。

1:进行授权

chmod +x jdk-7u25-linux-x64.rpm

一定要是root用户噢

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 3][]

2:安装rpm包

rpm -i jdk-7u25-linux-x64.rpm

rpm -ivh jdk-7u25-linux-x64.rpm

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 4][]

## 七:配置环境变量 ##

方式1:末尾添加配置(系统的环境变量)

进入到/etc文件夹下，找到profile文件，打开编辑。

用文本编辑器打开/etc/profile

vi /etc/profile (注意一定是要用root用户打开profile进行编辑)

·在profile文件末尾加入：

i 进去编辑命令

wq 退出保存

q! 退出不保存

\#set java environment

![20190825222734128.png][]

vi /etc/profile

在末尾行加入

\#set java environment

export JAVA\_HOME=/usr/java/jdk1.7.0\_25

export PATH=$JAVA\_HOME/bin:$PATH

export CLASSPATH=.:$JAVA\_HOME/lib/dt.jar:$JAVA\_HOME/lib/tools.jar

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 5][]

export JAVA\_HOME=/training/jdk1.7.0\_25

export PATH=$JAVA\_HOME/bin:$PATH

export CLASSPATH=.:$JAVA\_HOME/lib/dt.jar:$JAVA\_HOME/lib/tools.jar

2:使更改的配置立即生效

source /etc/profile

方式2:用户环境变量

1:列出了jdk安装后的目录

/usr/java/jdk1.7.0\_25

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 6][]

2:编辑环境变量

vi ~/.bash\_profile

3:使修改后的环境变量生效

source ~/.bash\_profile

## 八:检查是否安装成功 ##

1：java -version

![20190825222852735.png][]

2:printenv

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 7][]

3:javac

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI2OTYzNDMz_size_16_color_FFFFFF_t_70 8][]

4；java

## 九:注意问题 ##

1:问题1:

安装了JDK1.8,查看版本却是JDK1.7,这是因为你安装前没对Linux自带的JDK(内置 openJDK),需要卸载自带 openJDK

先查看JDK的相关安装包

rpm -qa | grep java

卸载 openJDK : rpm -e --nodeps rpm 包

[https_www.cnblogs.com_Dylansuns_p_6974272.html]: https://www.cnblogs.com/Dylansuns/p/6974272.html
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