Summary of the Development and packaging of a Java SWT desktop program (2)

Iii. File and stream problems

About the operation of files, an Elder wrote very full, I copy: http://www.cnblogs.com/lovebread/archive/2009/11/23/1609122.html

1) load all files under the specified directory

 1           //  Get the target file to be imported  2 File fromfile = New  File (frompath );  3           If (! Fromfile. isdirectory ()){  4               Throw  New Exception ("Please specify a folder! " );  5   }  6           //  Load files  7 File [] FS = Fromfile. listfiles ();  8 List <string> filenames = New Arraylist <string> (); //  File Name  9 List <File> files =New Arraylist <File> (); //  File  10           //  System. Out. println ("fs. Length -->" + FS. Length );  11           For  (File F: FS ){  12 String fn = F. getname ();  13               If ((! F. isdirectory () & (fn. endswith (". txt "))){ // End with .txt, not a folder  14                   Int I = fn. lastindexof ("." );  15                   If (I>-1) & I < FN. Length ())  16 Fn = fn. substring (0 , I );  17                   //  System. Out. println ("F. getname -->" + FN );  18   Filenames. Add (FN ); 19   Files. Add (f );  20   }  21 }

2) write files

 1           //  Copy the file to the specified directory, get the directory first, and then copy it. Note that you must first create a new file under the obtained directory, then you can write the content of the Java file object to this file.  2 String tofilepath = sysroot + "\ course \ User \\" ;  3           Int I = 0;  4 Bufferedinputstream inbuff = Null  ;  5 Bufferedoutputstream outbuff = Null  ;  6           For (I = 0; I <files. Size (); I ++ ){  7 File file = New File (tofilepath, filenames. Get (I) + ". Le" );  8              If (! File. exists ()){  9   File. createnewfile ();  10   }  11 Inbuff = New Bufferedinputstream ( New  Fileinputstream (files. Get (I )));  12 Outbuff = New Bufferedoutputstream ( New Fileoutputstream (File ));  13               Byte [] Buff = New   Byte [1024 ];  14               Int Len = 0 ;  15               While (LEN = inbuff. Read (buff ))! =-1 ){  16 Outbuff. Write (buff, 0 , Len );  17  }  18   Outbuff. Flush ();  19   }  20           If (Inbuff! = Null  )  21   Inbuff. Close ();  22           If (Outbuff! = Null  )  23 Outbuff. Close ();

3) wrap the content in the file:

String nextline = system. getproperty ("line. separator"); // It is used for line feed. This must be used together with the following, and the line feed will only be generated when it is written to a file.

In Windows, \ r \ n is a line break, so it can also be:String newxline = "\ r \ n ";

4) write files:

String tempstr = "This is the first line! ";
Tempstr + = nextline + "this is the second line! "
Bufferedoutputstream writer = new bufferedoutputstream (New fileoutputstream (CONF); writer. Write (tempstr. getbytes (), 0, tempstr. Length ());
 

Note: writer. Write (tempstr. getbytes (), 0, tempstr );

No: writer. Write (tempstr );

If it is the following, the file content will not wrap

 

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