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自从有了PPA安装方式，Ubuntu安装JDK就是非常快捷了，安装参考链接1 的方法，很快就能搞定。
最近可能是Oracle方便做了限制，这套流程安装到一半会报错：
Connecting to download.oracle.com (download.oracle.com)|23.215.130.99|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2017-10-18 11:07:34 ERROR 404: Not Found.
download failed
Oracle JDK 8 is NOT installed.
dpkg: error processing package oracle-java8-installer (--configure):
subprocess installed post-installation script returned error exit status 1
结合参考链接4、5两个帖子，整理了一个可以继续往下走的流程如下
下载 Java SE Development Kit 8u162
下载链接参考链接3，选择 jdk-8u162-linux-x64.tar.gz
替换dpkg info
进入dpkg/info目录，将PPA预构建的151版本替换成162
cd /var/lib/dpkg/info
sudo sed -i 's|JAVA_VERSION=8u151|JAVA_VERSION=8u162|' oracle-java8-installer.*
sudo sed -i 's|PARTNER_URL=http://download.oracle.com/otn-pub/java/jdk/8u151-b12/e758a0de34e24606bca991d704f6dcbf/|PARTNER_URL=http://download.oracle.com/otn-pub/java/jdk/8u162-b12/0da788060d494f5095bf8624735fa2f1/|' oracle-java8-installer.*
sudo sed -i 's|SHA256SUM_TGZ="c78200ce409367b296ec39be4427f020e2c585470c4eed01021feada576f027f"|SHA256SUM_TGZ="68ec82d47fd9c2b8eb84225b6db398a72008285fafc98631b1ff8d2229680257"|' oracle-java8-installer.*
sudo sed -i 's|J_DIR=jdk1.8.0_151|J_DIR=jdk1.8.0_162|' oracle-java8-installer.*
将下载的8u162放到缓存目录并再次安装
清理掉/var/cache/oracle-jdk8-installer/ 目录下原来下载失败的8u151的包
sudo mv jdk-8u(downloadedversion)-linux-x64.tar.gz /var/cache/oracle-jdk8-installer/ 再次执行安装（会发现缓存目录已经存在安装包，且散列值与dpkg info下的一致，自动跳过下载进入安装步骤）
sudo apt-get install oracle-java8-installer 附：unable to resolve host问题
参考2，新装的机器偶尔会出现这个问题，去host文件里把主机名加上即可
127.0.0.1 localhost xxxyyyzzz # 要保证这个主机名和 /etc/hostname 中的主机名一致
参考链接
- https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04
- https://github.com/JiangYongKang/JiangYongKang.github.io/issues/63
- http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
- https://askubuntu.com/questions/920106/webupd8-oracle-java-7-installer-failing-with-404
- https://stackoverflow.com/questions/46815897/jdk-8-is-not-installed-error-404-not-found
