安装JDK8
官网下载获取JDK
Oracle官网JDK8下载地址
https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
选择Linux x64 Compressed Archive 点击 jdk-8u281-linux-x64.tar.gz 下载jdk8。
下载时会要同意Oracle协议，点击打勾，然后再会要求登录Oracle账户。
输入用户名和密码，没有注册一个，点击登录后就可以下载jdk
wget命令获取JDK
也可以先登录然后选择在服务器下面用wget命令下载jdk。先从Oracle官网上选择要下载的jdk，然后再打开浏览器的开发者模式，查看要下载的jdk版本对应的链接 jdk-8u281-linux-x64.tar.gz，在Elements栏中能查看到a标签中有 data-flie 属性，点击复制属性这里是 //download.oracle.com/otn/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz在前面加上http: 同时otn换成otn-pub
最终jdk8的下载地址为 http://download.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz
然后用下载命令在服务下面下载jdk下载URL换成上面自己获取到的URL
wget —no-cookies —no-check-certificate —header “Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie” “http://download.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz”
[root@jrpt-1 software]# wget —no-cookies —no-check-certificate —header “Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie” “http://download.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz”
—2021-04-15 09:56:43— http://download.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz
Resolving download.oracle.com (download.oracle.com)… 23.67.68.237
Connecting to download.oracle.com (download.oracle.com)|23.67.68.237|:80… connected.
HTTP request sent, awaiting response… 302 Moved Temporarily
Location: https://edelivery.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz [following]
—2021-04-15 09:56:43— https://edelivery.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz
Resolving edelivery.oracle.com (edelivery.oracle.com)… 184.26.251.178, 2600:140b:2:99b::366, 2600:140b:2:9a8::366
Connecting to edelivery.oracle.com (edelivery.oracle.com)|184.26.251.178|:443… connected.
HTTP request sent, awaiting response… 302 Moved Temporarily
Location: https://download.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz?AuthParam=1618451925_477b68a45dd60daeb8d401ac070d84b1 [following]
—2021-04-15 09:56:44— https://download.oracle.com/otn-pub/java/jdk/8u281-b09/89d678f2be164786b292527658ca1605/jdk-8u281-linux-x64.tar.gz?AuthParam=1618451925_477b68a45dd60daeb8d401ac070d84b1
Connecting to download.oracle.com (download.oracle.com)|23.67.68.237|:443… connected.
HTTP request sent, awaiting response… 200 OK
Length: 143722924 (137M) [application/x-gzip]
Saving to: ‘jdk-8u281-linux-x64.tar.gz’
41% [====================================> ] 59,916,969 6.88MB/s eta 15s
[root@jrpt-1 software]# tar -zxvf jdk-8u281-linux-x64.tar.gz
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now
如果提示错误not in gzip format代表下载不是gzip文件，可能是html文件。
通过head命令查看，gzip文件里面会有很多乱码，而html文件直接是我们能看明白的东西。
[root@jrpt-1 software]# head jdk-8u281-linux-x64.tar.gz
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建议先通过浏览器下载到本地再上传到服务器
安装配置JDK
先创建解压文件要放的路径
[root@jrpt-1 software]# mkdir -vp /usr/local/tools/java
mkdir: created directory ‘/usr/local/tools’
mkdir: created directory ‘/usr/local/tools/java’
将文件解压到对应目录
[root@jrpt-1 software]# tar -zxvf jdk-8u281-linux-x64.tar.gz -C /usr/local/tools/java/
配置环境变量
vim /etc/profile
将如下代码追加到 profile 文件末尾：
JAVA_HOME=/usr/local/tools/java/jdk1.8.0_281
JRE_HOME=$JAVA_HOME/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME JRE_HOME PATH CLASSPATH
[root@jrpt-1 lib]# vim /etc/profile
使用配置生效
[root@jrpt-1 lib]# source /etc/profile
验证jdk已安装成功
确认java运行环境安装成功
[root@jrpt-1 lib]# java -version
java version “1.8.0_281”
Java(TM) SE Runtime Environment (build 1.8.0_281-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.281-b09, mixed mode)
确认java编译功能安装成功
[root@jrpt-1 lib]# javac
Usage: javac
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are used
-classpath
-cp
-sourcepath
-bootclasspath
-extdirs
-endorseddirs
-proc:{none,only} Control whether annotation processing and/or compilation is done.
-processor
-processorpath
-parameters Generate metadata for reflection on method parameters
-d
-s
-h
-implicit:{none,class} Specify whether or not to generate class files for implicitly referenced files
-encoding
-source
-target
-profile
-version Version information
-help Print a synopsis of standard options
-Akey[=value] Options to pass to annotation processors
-X Print a synopsis of nonstandard options
-J
-Werror Terminate compilation if warnings occur
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