What is the best way to concatenate several pdf files into one
document considering that I am getting pdf documents from a database:
Blob report = resultSet2.getBlob( "PdfDocument" );
Then I get binary stream and read it to an output. Below are the
details. I read in the book how one could combine a document using
PdfCopy. Can PdfCopy accept some kind of binary stream?
Below are details of my code. Appreciate your help.
Peter
try
{
String[] reportIdArray = reportId.split( "," );
//get collection of report ids
InputStream input = null;
// PdfCopy copy = new PdfCopy( document, output );
ByteArrayOutputStream byteArrayOutputStream = null;
for ( String reportPointer : reportIdArray )
{
String[] pointerArray = reportPointer.split
( ":" );
String sqlSelect2 = "select PdfDocument from
" + pointerArray[0] + " where id = ?";
PreparedStatement prepStatement2 =
conn.prepareStatement( sqlSelect2 );
prepStatement2.setString( 1, pointerArray[1] );
ResultSet resultSet2 =
prepStatement2.executeQuery();
if ( resultSet2.next() )
{
Blob report = resultSet2.getBlob
( "PdfDocument" );
// setup the streams
input = report.getBinaryStream(); //get
input from blob
ByteArrayOutputStream output = new
ByteArrayOutputStream();
byte[] rb = new byte[1024];
int ch = 0;
// get content of a document
while ( ( ch = input.read( rb ) ) != -1 )
{
output.write( rb, 0, ch );
}
byte[] buf = output.toByteArray();
byteArrayOutputStream = new
ByteArrayOutputStream();
byteArrayOutputStream.write( buf );
input.close();
output.close();
}
resultSet2.close();
}
response.setContentType( "application/pdf" );
ServletOutputStream out =
response.getOutputStream();
byteArrayOutputStream.writeTo( out );
out.flush();
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