参考：
https://my.oschina.net/shyloveliyi/blog/1627020
1、首先下载jre，下载地址是https://www.java.com/en/download/manual.jsp，大概是77M。
2、解压jre包，删除根目录下文本文件，然后删除其他不必要文件。
#解压
tar xvcf jre-8u161-linux-x64.tar.gz
#进入目录
cd jre1.8.0_161/
#删除文本文件
rm -rf COPYRIGHT LICENSE README release THIRDPARTYLICENSEREADME-JAVAFX.txtTHIRDPARTYLICENSEREADME.txt Welcome.html
#删除其他无用文件 rm -rf lib/plugin.jar \ lib/ext/jfxrt.jar \ bin/javaws \ lib/javaws.jar \ lib/desktop \ plugin \ lib/deploy* \ lib/*javafx* \ lib/*jfx* \ lib/amd64/libdecora_sse.so \ lib/amd64/libprism_*.so \ lib/amd64/libfxplugins.so \ lib/amd64/libglass.so \ lib/amd64/libgstreamer-lite.so \ lib/amd64/libjavafx*.so \ lib/amd64/libjfx*.so 3、重新打包所有文件(不打包也可以，在Dockerfile里ADD这个目录即可，当前精简完jre目录大小是107M，压缩后是41M)
tar zcvf jre8.tar.gz *4、创建Dockerfile
# using alpine-glibc instead of alpine is mainly because JDK relies on glibc
FROM docker.io/jeanblanchard/alpine-glibc
# author
MAINTAINER scc <[email protected]>
# A streamlined jre
ADD jre8.tar.gz /usr/java/jdk/
# set env
ENV JAVA_HOME /usr/java/jdk
ENV PATH ${PATH}:${JAVA_HOME}/bin # run container with base path:/opt WORKDIR /opt5、构建（整体大小是122M）
docker build -t voole/java8:1.0 .6、测试运行
# docker run -it voole/java8:1.0
/opt # java -version
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)