CentOS安装JDK教程
<p style="background: rgba(22, 159, 230, 1); padding: 2px 0 2px 10px; color: rgba(255, 255, 255, 1); border-left: 4px solid rgba(16, 63, 145, 1)"><span style="font-size: medium">JDK简介</span></p><p align="justify"><span style="font-size: medium">JDK是Java Development Kit 的缩写，是 Java 语言的软件开发工具包，主要用于移动设备、嵌入式设备上的java应用程序。JDK是整个java开发的核心，它包含了JAVA的运行环境（JVM+Java系统类库）和 JAVA工具。</span></p>
<p align="justify"><span style="font-size: medium">同时，JDK也是运行Tomcat等应用程序的必备运行环境，在安装Tomcat之前，必须要先安装JDK</span></p>
<p align="justify"> </p>
<p style="background: rgba(22, 159, 230, 1); padding: 2px 0 2px 10px; color: rgba(255, 255, 255, 1); border-left: 4px solid rgba(16, 63, 145, 1)"><span style="font-size: medium">下载JDK</span></p>
<p><span style="font-size: medium">官方下载链接：https://www.oracle.com/java/technologies/javase-jdk8-downloads.html</span></p>
<p><span style="font-size: medium">进入下载页面之后，选择合适的版本进行下载</span></p>
<p><span style="font-size: medium">由于我使用的是CentOS 64位的系统，所以这里选择Linux64位版本的压缩包（Linux x64 Compressed Archive）进行下载</span></p>
<p><img style="display: inline" title="image" src="https://img2018.cnblogs.com/blog/1378171/202003/1378171-20200310080439045-304519124.png" alt="image" width="1444" height="690"></p>
<p><span style="font-size: medium">现在Oracle的网站下载东西都要登录，登录之后即可开始下载</span></p>
<p><img style="display: inline" title="image" src="https://img2018.cnblogs.com/blog/1378171/202003/1378171-20200310080440532-350902708.png" alt="image" width="545" height="486"><span style="font-size: medium"><br></span></p>
<p style="background: rgba(22, 159, 230, 1); padding: 2px 0 2px 10px; color: rgba(255, 255, 255, 1); border-left: 4px solid rgba(16, 63, 145, 1)"><span style="font-size: medium">创建目录</span></p>
<p><span style="font-size: medium">下载完成后，将下载的压缩包<span style="background-color: rgba(204, 204, 204, 1)">jdk-8u241-linux-x64.tar.gz</span>通过FTP工具传输到CentOS服务器上</span></p>
<p><span style="font-size: medium">首先在<span style="background-color: rgba(204, 204, 204, 1)">/usr/local</span>目录下新建一个文件夹JDK</span></p>
<p><img style="margin: 0; display: inline" title="image" src="https://img2018.cnblogs.com/blog/1378171/202003/1378171-20200310080441363-1174676113.png" alt="image" width="581" height="331"></p>
<p><span style="font-size: medium">然后将下载好的JDK压缩文件放入这个文件夹</span></p>
<p><img style="margin: 0; display: inline" title="image" src="https://img2018.cnblogs.com/blog/1378171/202003/1378171-20200310080441935-74540017.png" alt="image" width="616" height="106"></p>
<p style="background: rgba(22, 159, 230, 1); padding: 2px 0 2px 10px; color: rgba(255, 255, 255, 1); border-left: 4px solid rgba(16, 63, 145, 1)"><span style="font-size: medium">安装JDK</span></p>
<p><span style="font-size: medium">使用root身份，通过SSH登录到服务器</span></p>
<p><span style="font-size: medium">cd到JDK存放的目录下，然后执行解压命令</span></p>
<div class="cnblogs_code" style="padding: 5px; border: 1px solid rgba(204, 204, 204, 1); border-image: none; background-color: rgba(245, 245, 245, 1)"><span style="font-size: small">cd /usr/local/<span style="color: rgba(0, 0, 0, 1)">jdk
</span><span style="color: rgba(0, 0, 255, 1)">tar</span> -zxvf jdk-8u241-linux-x64.<span style="color: rgba(0, 0, 255, 1)">tar</span>.gz</span></div>
<p><span style="font-size: medium">其中 <span style="background-color: rgba(204, 204, 204, 1)">jdk-8u241-linux-x64.tar.gz</span> 是下载的JDK压缩包文件名<br></span></p>
<p style="background: rgba(22, 159, 230, 1); padding: 2px 0 2px 10px; color: rgba(255, 255, 255, 1); border-left: 4px solid rgba(16, 63, 145, 1)"><span style="font-size: medium">环境变量配置</span></p>
<p><span style="font-size: medium">修改<span style="background-color: rgba(204, 204, 204, 1)">/etc</span>目录下的<span style="background-color: rgba(204, 204, 204, 1)">profile</span>文件</span></p>
<p><span style="font-size: medium">在profile文件末尾添加如下内容：</span></p>
<div class="cnblogs_code" style="padding: 5px; border: 1px solid rgba(204, 204, 204, 1); border-image: none; background-color: rgba(245, 245, 245, 1)">
<pre><span style="color: rgba(0, 0, 0, 1)"><span style="font-size: small">export JAVA_HOME=/usr/local/jdk/jdk1.8.0_241
export CLASSPATH=$:CLASSPATH:$JAVA_HOME/lib/
export PATH=$PATH:$JAVA_HOME/bin</span></span></pre>
</div>
<p><span style="font-size: medium">其中 JAVA_HOME需要根据实际安装路径和JDK版本进行修改</span></p>
<p><span style="font-size: medium"> </span></p>
<p><span style="font-size: medium">修改完成后，执行如下命令使修改生效</span></p>
<div class="cnblogs_code" style="padding: 5px; border: 1px solid rgba(204, 204, 204, 1); border-image: none; background-color: rgba(245, 245, 245, 1)">
<pre>source /etc/profile</pre>
</div>
<p style="background: rgba(22, 159, 230, 1); padding: 2px 0 2px 10px; color: rgba(255, 255, 255, 1); border-left: 4px solid rgba(16, 63, 145, 1)"><span style="font-size: medium">验证安装</span></p>
<p><span style="font-size: medium">执行命令</span></p>
<div class="cnblogs_code" style="padding: 5px; border: 1px solid rgba(204, 204, 204, 1); border-image: none; background-color: rgba(245, 245, 245, 1)">
<pre>java -version</pre>
</div>
<p><span style="font-size: medium">如果显示了jdk的版本信息，则说明jdk安装成功</span></p>
<p><img style="margin: 0; display: inline" title="image" src="https://img2018.cnblogs.com/blog/1378171/202003/1378171-20200310080442463-380391075.png" alt="image" width="460" height="84"></p><br><br>
来源：https://www.cnblogs.com/xiaowus/p/12453614.html
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