linux系统安装jdk

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一、yum安装

1、查看可安装的jdk版本

[root@centos76 ~]# yum -y list java*
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * elrepo: mirrors.neusoft.edu.cn
 * epel: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
Installed Packages
... 

2、选择对应版本进行安装

[root@centos76 ~]# yum install -y java-1.8.0-openjdk*
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
epel/x86_64/metalink                                                                                         | 6.5 kB  00:00:00     
 * base: mirrors.aliyun.com
 * elrepo: mirrors.neusoft.edu.cn
 * epel: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
...

三、查看安装的JDK版本

[root@centos76 ~]# java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-b10)
OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)

自动安装jdk的路径是在/usr/lib/jvm。

四、查看已经安装的jdk

[root@centos76 jvm]# rpm -qa| grep jdk
copy-jdk-configs-3.3-10.el7_5.noarch
java-1.8.0-openjdk-javadoc-1.8.0.222.b10-1.el7_7.noarch
java-1.8.0-openjdk-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-accessibility-debug-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-devel-debug-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-debug-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-src-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-accessibility-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-javadoc-zip-1.8.0.222.b10-1.el7_7.noarch
java-1.8.0-openjdk-headless-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-demo-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-src-debug-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-demo-debug-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-devel-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-javadoc-debug-1.8.0.222.b10-1.el7_7.noarch
java-1.8.0-openjdk-headless-debug-1.8.0.222.b10-1.el7_7.x86_64
java-1.8.0-openjdk-javadoc-zip-debug-1.8.0.222.b10-1.el7_7.noarch

五、卸载JDK

[root@centos76 jvm]# yum -y remove java-1.8.0-openjdk-headless-1.8.0.222.b10-1.el7_7.x86_64

二、jdk压缩包安装

1、下载安装包

在https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html中选择合适的版本进行下载,然后上传到linux的/usr/local/java文件夹下。

2、解压压缩包

使用如下命令解压压缩包:

tar zxvf jdk-8u66-linux-x64.tar.gz

删除压缩包:

rm -rf jdk-8u66-linux-x64.tar.gz

3、设置jdk环境变量

修改/etc/profile,添加如下内容:

JAVA_HOME=/usr/local/java/jdk1.8.0_221
PATH=$JAVA_HOME/bin:$PATH
export PATH JAVA_HOME

4、生效环境变量

source /etc/profile

5、查看jdk

java -version

 

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