Carriage Return Line feed in Java

Question

I have created a text file in Unix environment using Java code   For writing the text file I am using java io FileWriter and BufferedWriter  And for newline after each row I am using bw newLine   method  where bw is object of BufferedWriter    And I m sending that text file by attaching in mail from Unix environment itself  automated that using Unix commands    My issue is  after I download the text file from mail in a Windows system  if I  opened that text file the data is not properly aligned  newline   character is  not working  I think so   I want same text file alignment as it is in Unix environment  if I opened the text file in Windows environment also   How do I resolve the problem   Java code below for your reference  running in Unix environment    File f   new File strFileGenLoc   BufferedWriter bw   new BufferedWriter new FileWriter f  false    rs   stmt executeQuery  select   from jpdata    while   rs next           bw write rs getString 1   null     rs getString 1        bw newLine

User · Answer

The method newLine   ensures a platform-compatible new line is added  0Dh 0Ah for DOS  0Dh for older Macs  0Ah for Unix Linux   Java has no way of knowing on which platform you are going to send the text  This conversion should be taken care of by the mail sending entities

User · Answer

Java only knows about the platform it is currently running on  so it can only give you a platform-dependent output on that platform  using bw newLine       The fact that you open it on a windows system means that you either have to convert the file before using it  using something you have written  or using a program like unix2dos   or you have to output the file with windows format carriage returns in it originally in your Java program   So if you know the file will always be opened on a windows machine  you will have to output   bw write rs getString 1   null     rs getString 1    bw write   r n      It s worth noting that you aren t going to be able to output a file that will look correct on both platforms if it is just plain text you are using  you may want to consider using html if it is an email  or xml if it is data   Alternatively  you may need some kind of client that reads the data and then formats it for the platform that the viewer is using

User · Answer

Don t know who looks at your file  but if you open it in wordpad instead of notepad  the linebreaks will show correct  In case you re using a special file extension  associate it with wordpad and you re done with it  Or use any other more advanced text editor

User · Answer

If I understand you right  we talk about a text file attachment  Thats unfortunate because if it was the email s message body  you could always use   r n   referring to http   www faqs org rfcs rfc822 html  But as it s an attachment  you must live with system differences  If I were in your shoes  I would choose one of those options   a  only support windows clients by using   r n  as line end   b  provide two attachment files  one with linux format and one with windows format   c  I don t know if the attachment is to be read by people or machines  but if it is people I would consider attaching an HTML file instead of plain text  more portable and much prettier  too

User · Answer

bw newLine    cannot ensure compatibility with all systems   If you are sure it is going to be opened in windows  you can format it to windows newline   If you are already using native unix commands  try unix2dos and convert teh already generated file to windows format and then send the mail   If you are not using unix commands and prefer to do it in java  use   bw write   r n    and if it does not complicate your program  have a method that finds out the operating system and writes the appropriate newline

User · Answer

Encapsulate your writer to provide char replacement  like this   public class WindowsFileWriter extends Writer        private Writer writer       public WindowsFileWriter File file  throws IOException           try               writer   new OutputStreamWriter new FileOutputStream file    ISO-8859-15              catch  UnsupportedEncodingException e                writer   new FileWriter logfile                         Override     public void write char   cbuf  int off  int len  throws IOException           writer write new String cbuf  off  len  replace   n     r n                 Override     public void flush   throws IOException           writer flush                Override     public void close   throws IOException           writer close

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