java - Exception when moving files -


i'm assuming has limited knowledge of how filevisitor works , parses directories. i'm trying move contents of directory directory. i'm doing implementing filevisitor<path> this:

public class mover implements filevisitor<path> {      private path target;     private path source;      public mover(path source, path target) {         this.target = target;         this.source = source;     }      @override     public filevisitresult previsitdirectory(path dir, basicfileattributes attrs) throws ioexception {         path targetdir = target.resolve(source.relativize(dir));         try {             files.move(dir, targetdir);         } catch (filealreadyexistsexception e) {             if(!files.isdirectory(targetdir)) {                 system.out.println("throwing e!");                 throw e;                             }         }         return filevisitresult.continue;     }      @override     public filevisitresult postvisitdirectory(path file, ioexception exc) throws ioexception {         return filevisitresult.continue;     }      @override     public filevisitresult visitfile(path file, basicfileattributes attrs) throws ioexception {         try {             files.move(file, target.resolve(source.relativize(file)));                           } catch (nosuchfileexception e) {                 //todo: figure out why exception raised!                 system.out.println("nosuchfileexception");             }         return filevisitresult.continue;     }      @override     public filevisitresult visitfilefailed(path file, ioexception exc) throws ioexception {         return filevisitresult.continue;     }    }

in turn use class mover this:

files.walkfiletree(from, new mover(from, to));

i don't add from twice when calling walkfiletree, problem line under todo in code (however appreciate comments on how solve to). don't understand why exception raised. i'm guessing because file moved. if case how go stop code trying move again, way i'm doing more or less correct?

below function programmatically move file

set correct permissions in manifest

  <uses-permission android:name="android.permission.write_external_storage" /> 
    private void movefile(string inputpath, string inputfile, string outputpath) { inputstream in = null; outputstream out = null; try {     //create output directory if doesn't exist     file dir = new file (outputpath);      if (!dir.exists())     {         dir.mkdirs();     }     in = new fileinputstream(inputpath + inputfile);             out = new fileoutputstream(outputpath + inputfile);     byte[] buffer = new byte[1024];     int read;     while ((read = in.read(buffer)) != -1) {         out.write(buffer, 0, read);     }     in.close();     in = null;         // write output file         out.flush();     out.close();     out = null;     // delete original file     new file(inputpath + inputfile).delete();  }       catch (filenotfoundexception fnfe1) {     log.e("tag", fnfe1.getmessage()); }       catch (exception e) {     log.e("tag", e.getmessage());   } }

to delete file use

     private void deletefile(string inputpath, string inputfile) {     try {     // delete original file     new file(inputpath + inputfile).delete();      }   catch (filenotfoundexception fnfe1) {     log.e("tag", fnfe1.getmessage());  }   catch (exception e) {     log.e("tag", e.getmessage());  } }

to copy

         private void copyfile(string inputpath, string inputfile, string outputpath)         { inputstream in = null; outputstream out = null; try {     //create output directory if doesn't exist     file dir = new file (outputpath);      if (!dir.exists())     {         dir.mkdirs();     }     in = new fileinputstream(inputpath + inputfile);             out = new fileoutputstream(outputpath + inputfile);     byte[] buffer = new byte[1024];     int read;     while ((read = in.read(buffer)) != -1) {         out.write(buffer, 0, read);     }     in.close();     in = null;         // write output file (you have copied file)         out.flush();     out.close();     out = null;          }  catch (filenotfoundexception fnfe1) {     log.e("tag", fnfe1.getmessage());   }         catch (exception e) {     log.e("tag", e.getmessage());  } }

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