《云服务器上配置JDK环境，从入门到精通》详细介绍了在云服务器上配置JDK环境的步骤，包括选择适合的云服务器、安装操作系统、更新系统、安装JDK、配置环境变量等，该书还提供了丰富的实例和代码，帮助读者快速掌握JDK环境的配置和使用，对于初学者来说，该书是入门学习云服务器配置和JDK环境的绝佳选择；对于有一定经验的开发者来说，该书也提供了深入的技术细节和最佳实践，有助于提升技能水平，该书还介绍了如何根据应用需求选择适合的云服务器配置，包括CPU、内存、存储等方面的考虑。
随着云计算技术的不断发展，越来越多的企业和个人选择使用云服务器来部署和管理自己的应用程序，Java作为一种广泛使用的编程语言，在Web开发、企业级应用、移动应用等领域有着广泛的应用，在云服务器上配置JDK（Java Development Kit）环境，是开发和运行Java应用程序的基础，本文将详细介绍在云服务器上配置JDK环境的步骤,帮助读者轻松完成这一任务。
准备工作
在开始配置JDK环境之前,请确保您已经具备以下条件：
- 云服务器：您已经购买并成功登录了一台云服务器。
- SSH工具：用于远程登录云服务器，推荐使用PuTTY（Windows）或OpenSSH（Linux/Mac）。
- JDK安装包：下载您需要的JDK版本，可以从Oracle官网或OpenJDK官网获取。
登录云服务器
-
使用PuTTY登录：
- 打开PuTTY,输入您的云服务器IP地址。
- 设置端口号为22（默认SSH端口）。
- 输入用户名和密码，点击“Open”即可登录。
-
使用OpenSSH登录（适用于Linux/Mac）： 打开终端,输入以下命令：
ssh username@your_server_ip
输入用户名和密码后,即可登录。
检查Java环境
在登录后，首先检查服务器上是否已经安装了Java环境,输入以下命令：
java -version
如果系统提示“command not found”，则表示未安装Java环境，如果已安装,则会显示当前Java版本信息。
安装JDK
上传JDK安装包
使用SCP工具（如WinSCP或scp命令）将下载的JDK安装包上传到云服务器,使用scp命令上传：
scp jdk-17_linux-x64_bin.tar.gz username@your_server_ip:/usr/local/src/
解压JDK安装包
使用以下命令解压上传的JDK安装包：
cd /usr/local/src/ tar -zxvf jdk-17_linux-x64_bin.tar.gz
配置环境变量
编辑~/.bashrc或~/.bash_profile文件,添加以下内容：
export JAVA_HOME=/usr/local/src/jdk-17 export PATH=$JAVA_HOME/bin:$PATH
保存并退出编辑器,然后执行以下命令使配置生效：
source ~/.bashrc # 或者 source ~/.bash_profile
验证安装结果
再次运行java -version命令，如果显示当前安装的Java版本信息,则表示JDK安装成功。
java version "17" 2021-09-14 LTS; Java(TM) SE Runtime Environment 17.3+0-20210813083656.096; Java HotSpot(TM) 64-Bit Server VM 17+36-20210813083656.096, Mixed Mode, sharing, tiered compilation; Linux 5.4.0-81-generic amd64 compressed oops, gzenabled, gcm-enabled, ergo disabled, Avm+jit, compiler: JIT 39.15-b01, interpreter: none, fast jvmti enabled, tieredStopAtLevel 1 class,VM: OpenJDK 64-Bit Server VM, GC: G1 GC, heap size: 512M, compression: on; arguments: --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED; security: auth: none, crypto: all, all files; user: username; fp: amd64; display: :0; locale: en_US; image: /usr/local/src/jdk-17/lib/modules/jdk.image; vm: openj9; spec: OS: linux, arch: x86_64, family: unix; runtime: OpenJ9 VM; flags: all; compression used, shared spaces used, compressed class spaces used, tiered compilation used (class), AOT compilation used (class) (compiled classes), final world compilation used (class) (compiled classes); compilation used (class) (compiled methods), (total), (compiled ok), (runtime ok), (verified ok); user compile policy: disabled; default compile policy: enabled; diagnostic vminfo enabled; garbage collector info enabled; jvmti exports none; max heap size (computed) = 512M + 25% overhead = 640M; initial heap size (computed) = 512M; command line arguments: --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.util.concurrent=ALL-UNNAMED; default locale: en_US; initial locale settings guaranteed by the user's environment or unspecified and up to the discretion of the image builder; default charset: UTF-8, source code charset unspecified and up to the discretion of the image builder or the user's environment; default encoding for output streams is UTF-8; default encoding for input streams is UTF-8; default locale for input streams is the user's environment or unspecified and up to the discretion of the image builder; default locale for output streams is the user's environment or unspecified and up to the discretion of the image builder; default locale for file I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file system I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file name I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file path I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file access I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file attribute I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file timestamp I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file symbolic link I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file read link I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file execute I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file directory I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file read directory I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file list directory I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file create directory I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file delete I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file rename I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file set last modified time I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file symbolic link create I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file symbolic link delete I/O is the user's environment or unspecified and up to the discretion of the image builder; default locale for file read permissions I/O is the user's environment or unspecified and up to the discretion of
