I have two xlsx files at folder C:\\DemoFilesExcel\\demo1.xlsx and C:\\DemoFilesExcel\\demo2.xlsx.
I want to create a new xlsx C:\\DemoFilesExcel\\merged.xlsx that
//Open the first excel file.
Workbook SourceBook1 = new Workbook("F:\\Downloads\\charts.xlsx");
//Define the second source book.
//Open the second excel file.
Workbook SourceBook2 = new Workbook("F:\\Downloads\\picture.xlsx");
//Combining the two workbooks
SourceBook1.combine(SourceBook2);
//Save the target book file.
SourceBook1.save("F:\\Downloads\\combined.xlsx");
http://www.aspose.com/docs/display/cellsjava/Combine+Multiple+Workbooks+into+a+Single+Workbook