Spring Item Writer产生的文件的第一行前缀带有不可打印的字符

Question

I recently discovered that file produced by flat file item writer is prefixed with non printable characters. I have attached screenshot below. Project uses Spring 4.1.7 RELEASE jar with Spring batch version 2.2.5 RELEASE on java 8 platform. Any idea to resolve this?

See screenshot

[Update 03/20] This issue is resolved. Output file extension chosen was .out and for some reason when this file was created on Windows platform it had non-printable characters in the beginning of the line. When extension was changed to .txt, output was as expected. On Linux, output file with .out extension has no issues. To conclude, it was OS platform specific issue, but if someone knows actual reason behind this then please shed some light.

Answer 1

没有任何代码可看，我猜您正在写一行（可能是字符串），该行在Java中只包含NULL值，因此在文件中得到NULNULNULNUL...。