Record a bug caused by a line break

I'm learning java since , It's worth a lot \n As a newline , Sometimes I see that the line break character in some places is \r\n, I didn't care .
But in a project , I need to request a certificate from an interface , And then put the string of the certificate , Encapsulation head and tail , There is a file .
The certificate is about the following .

What I ask the interface to get is the intermediate string , The first and last lines are added manually .
The code is as follows ：

This certificate is crt Format , I still need it openssl Put this crt Certificate conversion p12 certificate .
As a result, when I execute the conversion command , give the result as follows ：

Prompt certificate not found , Later, I copied the contents of this certificate to other files , To perform , It can be parsed again .

I can't figure out why , The contents of the two documents are exactly the same , But a certificate can resolve , One can't .
Later, carefully compare the contents of the two certificates , There is still a little difference .

The newline character of a certificate takes up one byte , The other takes up two bytes .

Later, I learned from the information that ,
enter ：Carriage Return Use escape characters ’\r’ Express , It's obvious that the 2 The first letter of a word .

Line break ：New Line Use escape characters ’\n’ Express , It's obvious that the 1 The first letter of a word .
Windows Inside the system , Each line ends with “< Line break >< enter >”, namely “\n\r”; If you use a new line in the following file \n, There may be unexpected mistakes .

Change the code to :