Java Fundamentals Hardening IO Flow Note 20:fileoutputstream Write data to implement line breaks and append writes

1. How do I make a line break for my data?

(1)

1  PackageCom.himi.fileoutputstream;2 3 Importjava.io.FileNotFoundException;4 ImportJava.io.FileOutputStream;5 Importjava.io.IOException;6 7 8 /**9  * Ten * How to implement the data line wrapping?  One  * A  */ -  -  the  Public classFileOutputStreamDemo4 { -  -      Public Static voidMain (string[] args)throwsIOException { -         //creating a byte output stream object +FileOutputStream fos =NewFileOutputStream ("Fos3.txt"); -         //Write Data +          for(inti=0; i<10; i++) { AFos.write ("Love" +i). GetBytes ()); at         } -              -         //Freeing Resources - fos.close (); -          -          in     } -  to}

The effect is as follows: We don't have any new lines here, it's not what we want.

There is no line break here because you write the data without writing a newline character and writing a newline character.

(2) How do I write a newline character? As follows:

1 ImportJava.io.FileOutputStream;2 Importjava.io.IOException;3 4 5 /**6  * 7 * How to implement the data line wrapping? 8 * There is no line break because when you write to the data, there is no line break, write a newline character. 9  *Ten * line breaks for different systems are not the same: One * Windows:\ r \ n  A * Linux:\ n  - * Mac:\ r  - * While the usual advanced Notepad software is able to recognize any line break (such as the eclipse comes with Notepad software) the  */ -  -  -  Public classFileOutputStreamDemo4 { +  -      Public Static voidMain (string[] args)throwsIOException { +         //creating a byte output stream object AFileOutputStream fos =NewFileOutputStream ("Fos3.txt"); at         //Write Data -          for(inti=0; i<10; i++) { -Fos.write ("Love" +i). GetBytes ()); -Fos.write ("\ n". GetBytes ()); -         } -              in         //Freeing Resources - fos.close (); to          +          -     } the  *}

The results are as follows:

Go back to the project directory, as follows:

Open with notepad++, as follows:

Use Windows to bring your own Notepad open, as follows:

(3) Modify the code as follows:

1  PackageCom.himi.fileoutputstream;2 3 ImportJava.io.FileOutputStream;4 Importjava.io.IOException;5 6 7 /**8  * 9 * How to implement the data line wrapping? Ten * There is no line break because when you write to the data, there is no line break, write a newline character.  One  * A * line breaks for different systems are not the same: - * windows:\r\n  - * linux:\n  the * mac:\r  - * While the usual advanced Notepad software is able to recognize any line break (such as the eclipse comes with Notepad software) -  */ -  +  -  Public classFileOutputStreamDemo4 { +  A      Public Static voidMain (string[] args)throwsIOException { at         //creating a byte output stream object -FileOutputStream fos =NewFileOutputStream ("Fos3.txt"); -         //Write Data -          for(inti=0; i<10; i++) { -Fos.write ("Love" +i). GetBytes ()); -Fos.write ("\ r \ n". GetBytes ()); in         } -              to         //Freeing Resources + fos.close (); -          the          *     } $ Panax Notoginseng}

After running it found that all of the above Notepad software is wrapped, including the windows comes with Notepad software, as follows:

2. How do I add data ?

Use construction method: FileOutputStream (String name, Boolean append)

The parameter append is True, indicating append, and false to no append

The code is as follows:

1  PackageCom.himi.fileoutputstream;2 3 ImportJava.io.FileOutputStream;4 Importjava.io.IOException;5 6 7 /**8 * How to implement data append write? 9 * Using construction Method: FileOutputStream (String name, Boolean append)Ten * The parameter append is True, indicating append, and false to not append One  */ A  -  -  Public classFileOutputStreamDemo5 { the  -      Public Static voidMain (string[] args)throwsIOException { -         //creating a byte output stream object -         //FileOutputStream fos = new FileOutputStream ("Fos3.txt"); +          -         //FileOutputStream (String name, Boolean append) +FileOutputStream fos =NewFileOutputStream ("Fos3.txt",true); A         //Write Data at          for(inti=0; i<10; i++) { -Fos.write ("Love" +i). GetBytes ()); -Fos.write ("\ r \ n". GetBytes ()); -         } -              -         //Freeing Resources in fos.close (); -          to          +     } -  the}

The results are as follows:

Java Fundamentals Hardening IO Flow Note 20:fileoutputstream Write data to implement line breaks and append writes