dockerfile jdk1.8

您可以使用以下Dockerfile来构建一个基于CentOS 7的JDK 1.8镜像：

FROM centos:7
MAINTAINER YourName

# 创建目录并下载JDK安装包
RUN mkdir /usr/local/dockerjdk8
ADD jdk-8u171-linux-x64.tar.gz /usr/local/dockerjdk8

# 设置JAVA_HOME和PATH环境变量
ENV JAVA_HOME /usr/local/dockerjdk8/jdk1.8.0_171
ENV PATH $JAVA_HOME/bin:$PATH

这个Dockerfile首先基于CentOS 7创建了一个镜像，然后在镜像中创建了`/usr/local/dockerjdk8`目录，并将JDK 1.8的安装包拷贝到该目录下。接下来，通过`ENV`命令设置了`JAVA_HOME`环境变量为`/usr/local/dockerjdk8/jdk1.8.0_171`，并将`$JAVA_HOME/bin`添加到`PATH`环境变量中，以便可以直接运行Java命令。

请注意，您需要将实际的JDK安装包文件（例如`jdk-8u171-linux-x64.tar.gz`）放置在与Dockerfile相同的目录中，并在构建镜像时将其复制到指定的目录。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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