我想按字符串列之一对工作表中的行进行排序。我试图使用Sheet.shiftRows方法来实现这一点,但我无法做到这一点。在我的方法中,它不改变行的位置。我的密码怎么了?或者有更好的方法根据excel中的任何字符串列对行进行排序?
/**
* Sorts (A-Z) rows by String column
* @param sheet - sheet to sort
* @param column - String column to sort by
* @param rowStart - sorting from this row down
*/
private void sortSheet(Sheet sheet, int column, int rowStart) {
boolean sorting = true;
int lastRow = sheet.getLastRowNum();
while (sorting == true) {
sorting = false;
for (Row row : sheet) {
// skip if this row is before first to sort
if (row.getRowNum()<rowStart) continue;
// end if this is last row
if (lastRow==row.getRowNum()) break;
Row row2 = sheet.getRow(row.getRowNum()+1);
if (row2 == null) continue;
String firstValue = (row.getCell(column) != null) ? row.getCell(column).getStringCellValue() : "";
String secondValue = (row2.getCell(column) != null) ? row2.getCell(column).getStringCellValue() : "";
//compare cell from current row and next row - and switch if secondValue should be before first
if (secondValue.compareToIgnoreCase(firstValue)<0) {
sheet.shiftRows(row2.getRowNum(), row2.getRowNum(), -1);
sheet.shiftRows(row.getRowNum(), row.getRowNum(), 1);
sorting = true;
}
}
}
}知道如何管理工作表中的行排序吗?
更新上面的方法可以从ApachePOI3.9版本开始工作。
编辑:添加缺少的括号-helvio
发布于 2012-11-22 05:12:14
现在我知道为什么它不起作用了。shiftRows方法中有一个bug。当第三个参数(要移位的行数)为负数时,就会引起麻烦。
这里描述了这一点:bug.cgi?id=53798
更新这个错误已经从3.9版本中修复了
发布于 2012-11-02 20:52:54
Poi没有内置的排序机制,当然,您并不是第一个有这种需要的机制。
我认为您遇到了麻烦,因为您正在移动正在迭代的行。我已经运行了上面的代码,看起来在代码执行结束时,行正在从工作表中消失。
这个问题试图对读入表进行就地修改.我认为创建第二个输出表更合适。
因此,基本的方法是读取工作表,在java中进行排序,就像处理任何其他排序问题一样,将其写入输出表。如果您做了行号的映射,这对于您感兴趣的列的字符串值是唯一的,那么您可以按值对映射进行排序。如果您只预见到需要对单个列进行排序,这种方法就会起作用。无论如何,它并不像从excel中选择排序菜单选项那么简单。
发布于 2019-02-20 07:57:12
若要对行进行排序,需要:
代码:
import org.apache.commons.compress.utils.Lists;
import org.apache.poi.hssf.usermodel.HSSFOptimiser;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import java.util.List;
public static void sortSheet(Workbook workbook, Sheet sheet) {
//copy all rows to temp
List<Row> rows = Lists.newArrayList(sheet.rowIterator());
//sort rows in the temp
rows.sort(Comparator.comparing(cells -> cells.getCell(0).getStringCellValue()));
//remove all rows from sheet
removeAllRows(sheet);
//create new rows with values of sorted rows from temp
for (int i = 0; i < rows.size(); i++) {
Row newRow = sheet.createRow(i);
Row sourceRow = rows.get(i);
// Loop through source columns to add to new row
for (int j = 0; j < sourceRow.getLastCellNum(); j++) {
// Grab a copy of the old/new cell
Cell oldCell = sourceRow.getCell(j);
Cell newCell = newRow.createCell(j);
// If the old cell is null jump to next cell
if (oldCell == null) {
newCell = null;
continue;
}
// Copy style from old cell and apply to new cell
CellStyle newCellStyle = workbook.createCellStyle();
newCellStyle.cloneStyleFrom(oldCell.getCellStyle());
newCell.setCellStyle(newCellStyle);
// If there is a cell comment, copy
if (oldCell.getCellComment() != null) {
newCell.setCellComment(oldCell.getCellComment());
}
// If there is a cell hyperlink, copy
if (oldCell.getHyperlink() != null) {
newCell.setHyperlink(oldCell.getHyperlink());
}
// Set the cell data type
newCell.setCellType(oldCell.getCellType());
// Set the cell data value
switch (oldCell.getCellType()) {
case BLANK:
newCell.setCellValue(oldCell.getStringCellValue());
break;
case BOOLEAN:
newCell.setCellValue(oldCell.getBooleanCellValue());
break;
case ERROR:
newCell.setCellErrorValue(oldCell.getErrorCellValue());
break;
case FORMULA:
newCell.setCellFormula(oldCell.getCellFormula());
break;
case NUMERIC:
newCell.setCellValue(oldCell.getNumericCellValue());
break;
case STRING:
newCell.setCellValue(oldCell.getRichStringCellValue());
break;
}
}
// If there are are any merged regions in the source row, copy to new row
for (int j = 0; j < sheet.getNumMergedRegions(); j++) {
CellRangeAddress cellRangeAddress = sheet.getMergedRegion(j);
if (cellRangeAddress.getFirstRow() == sourceRow.getRowNum()) {
CellRangeAddress newCellRangeAddress = new CellRangeAddress(newRow.getRowNum(),
(newRow.getRowNum() +
(cellRangeAddress.getLastRow() - cellRangeAddress.getFirstRow()
)),
cellRangeAddress.getFirstColumn(),
cellRangeAddress.getLastColumn());
sheet.addMergedRegion(newCellRangeAddress);
}
}
}
}
private static void removeAllRows(Sheet sheet) {
for (int i = 0; i < sheet.getLastRowNum(); i++) {
sheet.removeRow(sheet.getRow(i));
}
}https://stackoverflow.com/questions/13134490
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