今天使用wget的方式在Linux上下载jdk-8u201-linux-x64.tar.gz，
[root@192 ~]# wget https://download.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/jdk-8u201-linux-x64.tar.gz
下载完发现文件大小仅有5.2KB，
[root@192 ~]# ls -lht jdk-8u201-linux-x64.tar.gz -rw-r--r--. 1 root root 5.2K Mar 20 2012 jdk-8u201-linux-x64.tar.gz
回过头细看下载信息，
[root@192 ~]# wget https://download.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/jdk-8u201-linux-x64.tar.gz--2019-04-10 07:47:59-- https://download.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/jdk-8u201-linux-x64.tar.gzResolving download.oracle.com (download.oracle.com)... 104.84.238.23Connecting to download.oracle.com (download.oracle.com)|104.84.238.23|:443... connected.HTTP request sent, awaiting response... 302 Moved TemporarilyLocation: https://edelivery.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/jdk-8u201-linux-x64.tar.gz [following]--2019-04-10 07:48:00-- https://edelivery.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/jdk-8u201-linux-x64.tar.gzResolving edelivery.oracle.com (edelivery.oracle.com)... 104.76.129.204, 2600:1406:1400:690::366, 2600:1406:1400:69d::366Connecting to edelivery.oracle.com (edelivery.oracle.com)|104.76.129.204|:443... connected.HTTP request sent, awaiting response... 302 Moved TemporarilyLocation: http://download.oracle.com/errors/download-fail-1505220.html [following]--2019-04-10 07:48:05-- http://download.oracle.com/errors/download-fail-1505220.htmlConnecting to download.oracle.com (download.oracle.com)|104.84.238.23|:80... connected.HTTP request sent, awaiting response... 301 Moved PermanentlyLocation: https://download.oracle.com/errors/download-fail-1505220.html [following]--2019-04-10 07:48:05-- https://download.oracle.com/errors/download-fail-1505220.htmlConnecting to download.oracle.com (download.oracle.com)|104.84.238.23|:443... connected.HTTP request sent, awaiting response... 200 OKLength: 5307 (5.2K) [text/html]Saving to: ‘jdk-8u201-linux-x64.tar.gz’100%[==================================================================>] 5,307 --.-K/s in 0s 2019-04-10 07:48:06 (371 MB/s) - ‘jdk-8u201-linux-x64.tar.gz’ saved [5307/5307]
查看最后几行，不难发现下载的其实是一个html失败页面，最后保存到jdk-8u201-linux-x64.tar.gz中。
发生失败的原因是Oracle对其资源的下载限制，那么如何wget下载jdk压缩包呢？
wget --no-check-certificate -c --header "Cookie: oraclelicense=accept-securebackup-cookie" https://download.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/jdk-8u201-linux-x64.tar.gzORwget --no-check-certificate -c --header="Cookie: oraclelicense=accept-securebackup-cookie" https://download.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/jdk-8u201-linux-x64.tar.gz
即给wget添加参数，使之跳过某些校验即可，具体可查询wget相关参数介绍，如下：
[root@192 ~]# wget -hGNU Wget 1.14, a non-interactive network retriever.Usage: wget [OPTION]... [URL]...Mandatory arguments to long options are mandatory for short options too.HTTPS (SSL/TLS) options: --no-check-certificate don't validate the server's certificate.Download: -c, --continue resume getting a partially-downloaded file.HTTP options: -E, --header=STRING insert STRING among the headers.