Setting filter on headers of an Excel sheet via POI
easiest way of adding filter on header :
sheet.setAutoFilter(new CellRangeAddress(0, 0, 0, numColumns));
sheet.createFreezePane(0, 1);
Save the first and last cell from filter area, and execute:
sheet.setAutoFilter(new CellRangeAddress(firstCell.getRow(), lastCell.getRow(), firstCell.getCol(), lastCell.getCol()));
For example, from the below sheet.
>x (x, y)
0123456
0|--hhh--| h = header
1|--+++--| + = values
2|--+++--| - = empty fields
3|--+++--|
4|-------|
first cell will be the header above the first +
(2,1) cell. The last will be the last +
cell (5,3)
If you also want to set a filter programmatically, you could use the following:
void setAutoFilter(final XSSFSheet sheet, final int column, final String value) {
sheet.setAutoFilter(CellRangeAddress.valueOf("A1:Z1"));
final CTAutoFilter sheetFilter = sheet.getCTWorksheet().getAutoFilter();
final CTFilterColumn filterColumn = sheetFilter.addNewFilterColumn();
filterColumn.setColId(column);
final CTFilter filter = filterColumn.addNewFilters().insertNewFilter(0);
filter.setVal(value);
// We have to apply the filter ourselves by hiding the rows:
for (final Row row : sheet) {
for (final Cell c : row) {
if (c.getColumnIndex() == column && !c.getStringCellValue().equals(value)) {
final XSSFRow r1 = (XSSFRow) c.getRow();
if (r1.getRowNum() != 0) { // skip header
r1.getCTRow().setHidden(true);
}
}
}
}
}
Relevant Gradle dependencies:
// https://mvnrepository.com/artifact/org.apache.poi/poi
compile group: 'org.apache.poi', name: 'poi', version: '3.9'
// https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml
compile group: 'org.apache.poi', name: 'poi-ooxml', version: '3.9'
// https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas
compile group: 'org.apache.poi', name: 'poi-ooxml-schemas', version: '3.9'
// https://mvnrepository.com/artifact/org.apache.poi/ooxml-schemas
compile group: 'org.apache.poi', name: 'ooxml-schemas', version: '1.3'