Not a BufferedReader and BufferedWriter a be open at the same time?

For the experienced:

I write a class to selectively extract data from an Excel file and write in a plain text file. I use JDeveloper 11.1.1.3.

It works very well and writes the output as expected file when reading data from the spreadsheet and write directly to the output file.

However, I need to convert data in one column based on a conversion table. The conversion table is a text file that has two columns separated by a space. I read in the conversion table using a BufferedReader and put it in a hash table to use. However, once the buffered reader and the hash table are introduced, the BufferedWriter does no more work.

How the class works are the main() method (not shown here) reads the data from the Excel sheet in a list and then calls the method showExcelData() (as illustrated below) to write the data to the list in a plain text file.

When the green color code has not been added, the output file was written on the drive end. An example of the output file line is:

JOHN:DOE:11223344:12345:20110824

By adding the Green code, I expect the output of the line as:

JOHN:DOE:11223344:STUDENT:20110824

The problem is, after the Green code is added, the output file, the program writes to the disk's size zero.

I added the lines of System.out.println () for troubleshooting. These lines indicate that the BufferedWriter on is not null, and the conversion is actually underway. But out.write ( ) just doesn't work. Commenting on the Green code, the program works again - of course without conversion of the date of this column.

There must be something wrong, but I don't see where it's a mistake.

Your help is very appreciated!

Newman

< pre >
public private static Sub showExcelData (list sheetData, String outputFilename) throws IOException {}
BufferedWriter out = new BufferedWriter (new FileWriter (outputFilename));
System.out.println ("Is Null?" + (out is nothing));
BufferedReader in = null;
for (int i = 3; i < sheetData.size (); i ++) {}
List = (List) sheetData.get (i);
for (int j = 0; j < list.size (); j ++) {}
(HSSFCell) = list.get (j) HSSFCell cell;
If (j == 5: j == 6 | j == 7: j == 11) {}
 
The column with index 11 is the column of data in need of conversion:
If (j == 11) {}
String convertionFilename = "ConversionTable.txt";
Map < String, String > liveMap =.
new HashMap < String, String > ();
try {}
in = new BufferedReader (new FileReader (convertionFilename));
String line = null;
While ((line = in.readLine ())! = null) {}
String [] keyValue = line.split("");
liveMap.put (keyValue [0], keyValue [1]);
}
} catch (IOException e) {}
String message = e.getMessage ();
}

TitleCode = string
cell.getRichStringCellValue (m:System.NET.SocketAddress.ToString ());

Role of the string = liveMap.get (titleCode) .toUpperCase ();
out. Write (Role);
System.out.println (titleCode + "" + role);
} else { < / make >}
out. Write (Cell.getRichStringCellValue (). ToString () .toUpperCase ());
System.out.println (Cell.getRichStringCellValue (). ToString () .toUpperCase ()); 
} < / make >
If (j < list.size () - 1 & & d! = 11) {}
out. Write(":");
}
} Else if (j == 26) {}
If (cell.getCellType () == HSSFCell.CELL_TYPE_NUMERIC) {}
If (DateUtil.isCellDateFormatted (cell)) {}
Calendar cellDate = Calendar.GetInstance ();
cellDate.setTimeInMillis (cell.getDateCellValue () .getTime ());
String year = ' "+ cellDate.get (Calendar.YEAR);
String = month
Padding (cellDate.get (Calendar.month) + 1);
String = day
Padding (cellDate.get (Calendar.DAY_OF_MONTH));
String expDate = year + month + day;
out. Write (":" + expDate);
}
}
}
}
out. Write (System.GetProperty ("Line.Separator"));
}
If (in! = null) in.close ();
If (out! = null) out.close ();
}
< / pre >

BufferedWriter is, uh, buffered so that you won't see the effect of write() immediately, maybe not until you close the file.

You don't need to open this file to reference and build the card anywhere again for each line. Out of the loop. And you're not close every time you open it, which could cause other problems... and finally you seem to be ignorant of the exceptions. Never do this. You have not actually need the reader and the writer open at the same time, even if this isn't the real problem here.

Tags: Java

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