Carriage Return(“\r\n”) in java [duplicate]

Answer 1

Contrary to your claim, your code clearly isn't writing "\r\n" after each line. It's calling BufferedWriter.newLine() which uses the current platform's default line separator (unless you explicitly set the line.separator system property). On Unix systems this will be "\n".

Now, you need to think about what you want the result to be on the target systems where it will be read. For Windows, that means you should explicitly write "\r\n"... I don't know about the mainframes you mention though - you'd need to give more details.

Note that the fact that there are different line separators available means that no one text file will be universally suitable. Many text editors on different platforms cope with any line separator... but there will always be some that don't :(

Answer 2

To write a file with environmentally correct line endings, the recommended class is PrintWriter. The println(String) method will output the given string and the appropriate line ending to the output file.

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Jon Skeet is right, though: Your problem isn't so much technical as figuring out which file format you need on which system. If a file is processed on a Windows system, it is expected that lines end in \r\n; on Unix systems, just \n.

All this is complicated even more when you use FTP to transfer files between different systems: ASCII mode will automatically translate line endings for you, binary will not.

Email is also not kind to text formats: Outlook frequently mutilates text files sent across system boundaries.

People here on SO know about this kind of stuff. Give us some more details to work with and we can propose solutions. But it will likely not be possible to write a file on one system that will be correctly read on any system.