Linux下wget方式下载jdk压缩包仅5KB的问题

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.gz
Resolving download.oracle.com (download.oracle.com)... 104.84.238.23
Connecting to download.oracle.com (download.oracle.com)|104.84.238.23|:443... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: 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.gz
Resolving edelivery.oracle.com (edelivery.oracle.com)... 104.76.129.204, 2600:1406:1400:690::366, 2600:1406:1400:69d::366
Connecting to edelivery.oracle.com (edelivery.oracle.com)|104.76.129.204|:443... connected.
HTTP request sent, awaiting response... 302 Moved Temporarily
Location: http://download.oracle.com/errors/download-fail-1505220.html [following]
--2019-04-10 07:48:05--  http://download.oracle.com/errors/download-fail-1505220.html
Connecting to download.oracle.com (download.oracle.com)|104.84.238.23|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://download.oracle.com/errors/download-fail-1505220.html [following]
--2019-04-10 07:48:05--  https://download.oracle.com/errors/download-fail-1505220.html
Connecting to download.oracle.com (download.oracle.com)|104.84.238.23|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 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https://download.oracle.com/errors/download-fail-1505220.html，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.gz
OR
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.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 -h
GNU 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.