Linux CentOS下安装JDK

Posted 2020-11-21 moonsoft

本文讲解如何在Linux CentOS下，下载安装JDK

本文讲解如何在Linux CentOS下，下载安装JDK

环境：

Linux CentOS

本文实践内容，使用阿里云ECS，通过XShell客户端连接阿里云服务器操作实现。读者也可以在自己PC机，或服务器Linux操作系统下，完成JDK下载安装操作。

1、下载JDK

从网上，搜索到一个指令，但是有问题，报“404 not found”，需要将下载jdk的url修改一下，就可以了

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u111-b14/jdk-8u171-linux-x64.tar.gz

如上这个 url 有问题，将最后的 链接替换下，从oracle的官网查找最新jdk的url

鼠标，右键——“复制链接地址”

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz

可以成功的下载：

 Linux终端显示：

 1 [root@izuf6famz0x92jd98na1kiz download]# wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz
 2 --2018-07-04 14:09:57--  http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz
 3 Resolving download.oracle.com (download.oracle.com)... 104.127.201.249
 4 Connecting to download.oracle.com (download.oracle.com)|104.127.201.249|:80... connected.
 5 HTTP request sent, awaiting response... 302 Moved Temporarily
 6 Location: https://edelivery.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz [following]
 7 --2018-07-04 14:09:57--  https://edelivery.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz
 8 Resolving edelivery.oracle.com (edelivery.oracle.com)... 184.26.250.202, 2600:1417:76:19a::2d3e, 2600:1417:76:181::2d3e
 9 Connecting to edelivery.oracle.com (edelivery.oracle.com)|184.26.250.202|:443... connected.
10 HTTP request sent, awaiting response... 302 Moved Temporarily
11 Location: http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz?AuthParam=1530684717_3a28246d3478a7373e7ff2e35b8998ad [following]
12 --2018-07-04 14:09:58--  http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz?AuthParam=1530684717_3a28246d3478a7373e7ff2e35b8998ad
13 Connecting to download.oracle.com (download.oracle.com)|104.127.201.249|:80... connected.
14 HTTP request sent, awaiting response... 200 OK
15 Length: 190890122 (182M) [application/x-gzip]
16 Saving to: ‘jdk-8u171-linux-x64.tar.gz’
17 
18 100%[=========================================================================================================================================>] 190,890,122 3.17MB/s   in 31s    
19 
20 2018-07-04 14:10:29 (5.90 MB/s) - ‘jdk-8u171-linux-x64.tar.gz’ saved [190890122/190890122]

查看下载后的目录

2、创建目录

mkdir /usr/java

把下载的 jdk-8u171-linux-x64.tar.gz 放进这个目录

mv jdk-8u171-linux-x64.tar.gz /usr/java

3、解压缩

tar -zxvf jdk-8u171-linux-x64.tar.gz

 自动解压

解压后会在Java文件夹下产生一个jdk1.8.0_171目录

 

4、定义JAVA_HOME的环境变量目录

打开 /etc/profile 文件

vi /etc/profile

在其中，定义 java的环境变量

set java environment
JAVA_HOME=/usr/java/jdk1.8.0_171
CLASSPATH=$JAVA_HOME/lib/
PATH=$PATH:$JAVA_HOME/bin
export JAVA_HOME CLASSPATH PATH

保存并执行，让修改生效

source /etc/profile

5、检测jdk安装成功与否

echo $JAVA_HOME

或者

java -version

JDK配置完成。

 

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