JDK安装和Java开发环境变量配置（详细）

超、凢脫俗 2024-03-26 12:38 68阅读 0赞

#### 下载 ####

首先去官网[https://www.oracle.com/java/technologies/downloads/][https_www.oracle.com_java_technologies_downloads]下载jdk，目前jdk已更新至19

![d64236043c559c00735ccde6c3b3a789.png][]

推荐jdk8和jdk11（新版本jdk一般是测试较不稳定，jdk8和jdk11是大版本较为常用）

![fdb35fd0142d557e9869948e974a9863.png][]

#### 安装 ####

双击安装包

![5921e08917873efeabacf41c6bff2164.png][]

点击下一步（这里用jdk7为例）

![ed811b80078dab7682cb3f857e4e8922.png][]

选择安装路径,一般选择默认路径

![791fbe8fd95824b428de4a2825e1ae06.png][]

安装JRE,同上面步骤一样,选择安装路径

![3364c23d9b8101ec8e210250c145c272.png][]

点击”关闭”,暂时不管”后续步骤”.JDK软件包安装完毕

![02e94bb502573569cc4f289605d2cdd7.png][]

#### 配置环境变量 ####

右击桌面上”此电脑”，选择“属性”

![ed633307463dd0536b045f2119efcfa6.png][]

选择“高级系统设置“

![35a87b358f7653e459ef7c6f7ff1fee6.png][]

选择“环境变量“

![89d329838f7293c056ce609676dabaa8.png][]

选择“系统变量”里的“新建”。

![239d06248d50624a0cf16aa14f1a17a6.png][]

新建“JAVA\_HOME”变量，变量值为你的JDK软件安装路径“C:\\Program Files\\Java\\jdk1.7.0\_80”

![eb65fdc8b4176ef60d6f16c507854b4d.png][]

新建“PATH”变量，变量值为“%JAVA\_HOME%\\bin;%JAVA\_HOME%\\jre\\bin;”（这个值固定不变，复制粘贴，不要自己输入，容易出错）

![0008f87d7a21bde562c85e483fe83641.png][]

新建“CLASSPATH”变量，变量值为“.;%JAVA\_HOME%\\lib\\dt.jar;%JAVA\_HOME%\\lib\\tools.jar;”（这个值固定不变，复制粘贴，不要自己输入，容易出错）

![abcfe806cd89477ea052c487aba84d0f.png][]

点击“确定”，关闭环境变量配置界面。

![da87bbf336e18788c85f35022d10d16b.png][]

#### 检测 ####

检测JDK软件和JRE是否安装成功。打开运行窗口（Windows+R）

![b2e6126b677fd5846448a66aef174c3a.png][]

输入Javac

![1074373ca63906a0122b1744885fb5f3.png][]

输入Java

![6b60776fb610a3e7e41be2b9efcb630e.png][]

查询版本信息javac -version（注意-前空格）

![7dfe39b63207ec45ef3893824ed8cfb6.png][]

之前安装的是jdk8所以显示jdk8版本

[https_www.oracle.com_java_technologies_downloads]: https://www.oracle.com/java/technologies/downloads/
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