contentType = "text/html";
exporter = new JRHtmlExporter();
//... ...
}else if( FORMAT_CSV.equalsIgnoreCase( type ) ){
contentType = "text/csv";
exporter = new JRCsvExporter();
}else if( FORMAT_RTF.equalsIgnoreCase( type ) ){
contentType = "application/msword";
exporter = new JRRtfExporter();
}else if( FORMAT_XLS.equalsIgnoreCase( type ) ){
contentType = "application/vnd.ms-excel";