有2種方法:
1.
FileWriter.filewriter=new FileWriter( file,append);
PrintWriter.fileout=new PrintWriter(filewriter);
fileout.print( "\n "+shr);
fileout.close();
filewriter.close();
append 爲true 不覆蓋 , false覆蓋
2.
RandomAccessFile fos=new RandomAccessFile( file);
fos.seek(fos.length());//將指針移動到文件尾
fos.writeBytes( "\n "+shr);
fos.close();