PoiMergeCellUtil.java
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package com.bckefu.excel.util;
import com.bckefu.excel.exception.ExcelExportException;
import com.bckefu.excel.entity.params.MergeEntity;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
import java.util.*;
/**
* @author caoliang1918@aliyun.com
* @Date 2017/11/5:23:31
*/
public final class PoiMergeCellUtil {
private PoiMergeCellUtil() {
}
/**
* 纵向合并相同内容的单元格
*
* @param sheet
* @param startRow 开始行
* @param columns 需要处理的列
*/
public static void mergeCells(Sheet sheet, int startRow, Integer... columns) {
if (columns == null) {
throw new ExcelExportException("至少需要处理1列");
}
Map<Integer, int[]> mergeMap = new HashMap<Integer, int[]>();
for (int i = 0; i < columns.length; i++) {
mergeMap.put(columns[i], null);
}
mergeCells(sheet, mergeMap, startRow, sheet.getLastRowNum());
}
/**
* 纵向合并相同内容的单元格
*
* @param sheet
* @param mergeMap key--列,value--依赖的列,没有传空
* @param startRow 开始行
*/
public static void mergeCells(Sheet sheet, Map<Integer, int[]> mergeMap, int startRow) {
mergeCells(sheet, mergeMap, startRow, sheet.getLastRowNum());
}
/**
* 纵向合并相同内容的单元格
*
* @param sheet
* @param mergeMap key--列,value--依赖的列,没有传空
* @param startRow 开始行
* @param endRow 结束行
*/
public static void mergeCells(Sheet sheet, Map<Integer, int[]> mergeMap, int startRow,
int endRow) {
Map<Integer, MergeEntity> mergeDataMap = new HashMap<Integer, MergeEntity>();
if (mergeMap.size() == 0) {
return;
}
Row row;
Set<Integer> sets = mergeMap.keySet();
String text;
for (int i = startRow; i <= endRow; i++) {
row = sheet.getRow(i);
for (Integer index : sets) {
if (row == null || row.getCell(index) == null) {
if (mergeDataMap.get(index) == null) {
continue;
}
if (mergeDataMap.get(index).getEndRow() == 0) {
mergeDataMap.get(index).setEndRow(i - 1);
}
} else {
text = row.getCell(index).getStringCellValue();
if (StringUtils.isNotEmpty(text)) {
hanlderMergeCells(index, i, text, mergeDataMap, sheet, row.getCell(index),
mergeMap.get(index));
} else {
mergeCellOrContinue(index, mergeDataMap, sheet);
}
}
}
}
if (mergeDataMap.size() > 0) {
for (Integer index : mergeDataMap.keySet()) {
if(mergeDataMap.get(index).getEndRow() > mergeDataMap.get(index).getStartRow()) {
sheet.addMergedRegion(new CellRangeAddress(mergeDataMap.get(index).getStartRow(),
mergeDataMap.get(index).getEndRow(), index, index));
}
}
}
}
/**
* 处理合并单元格
*
* @param index
* @param rowNum
* @param text
* @param mergeDataMap
* @param sheet
* @param cell
* @param delys
*/
private static void hanlderMergeCells(Integer index, int rowNum, String text,
Map<Integer, MergeEntity> mergeDataMap, Sheet sheet,
Cell cell, int[] delys) {
if (mergeDataMap.containsKey(index)) {
if (checkIsEqualByCellContents(mergeDataMap.get(index), text, cell, delys, rowNum)) {
mergeDataMap.get(index).setEndRow(rowNum);
} else {
if(mergeDataMap.get(index).getEndRow() > mergeDataMap.get(index).getStartRow()){
sheet.addMergedRegion(new CellRangeAddress(mergeDataMap.get(index).getStartRow(),
mergeDataMap.get(index).getEndRow(), index, index));
}
mergeDataMap.put(index, createMergeEntity(text, rowNum, cell, delys));
}
} else {
mergeDataMap.put(index, createMergeEntity(text, rowNum, cell, delys));
}
}
/**
* 字符为空的情况下判断
*
* @param index
* @param mergeDataMap
* @param sheet
*/
private static void mergeCellOrContinue(Integer index, Map<Integer, MergeEntity> mergeDataMap,
Sheet sheet) {
if (mergeDataMap.containsKey(index)
&& mergeDataMap.get(index).getEndRow() != mergeDataMap.get(index).getStartRow()) {
try {
sheet.addMergedRegion(new CellRangeAddress(mergeDataMap.get(index).getStartRow(),
mergeDataMap.get(index).getEndRow(), index, index));
} catch (Exception e) {
}
mergeDataMap.remove(index);
}
}
private static MergeEntity createMergeEntity(String text, int rowNum, Cell cell, int[] delys) {
MergeEntity mergeEntity = new MergeEntity(text, rowNum, rowNum);
// 存在依赖关系
if (delys != null && delys.length != 0) {
List<String> list = new ArrayList<String>(delys.length);
mergeEntity.setRelyList(list);
for (int i = 0; i < delys.length; i++) {
list.add(getCellNotNullText(cell, delys[i], rowNum));
}
}
return mergeEntity;
}
private static boolean checkIsEqualByCellContents(MergeEntity mergeEntity, String text,
Cell cell, int[] delys, int rowNum) {
// 没有依赖关系
if (delys == null || delys.length == 0) {
return mergeEntity.getText().equals(text);
}
// 存在依赖关系 测试
if (mergeEntity.getText().equals(text)) {
for (int i = 0; i < delys.length; i++) {
if (mergeEntity.getRelyList().get(i) == null || !mergeEntity.getRelyList().get(i)
.equals(getCellNotNullText(cell, delys[i], rowNum))) {
return false;
}
}
return true;
}
return false;
}
/**
* 获取一个单元格的值,确保这个单元格必须有值,不然向上查询
*
* @param cell
* @param index
* @param rowNum
* @return
*/
private static String getCellNotNullText(Cell cell, int index, int rowNum) {
if (cell == null || cell.getRow() == null) {
return null;
}
if (cell.getRow().getCell(index) != null
&& StringUtils.isNotEmpty(cell.getRow().getCell(index).getStringCellValue())) {
return cell.getRow().getCell(index).getStringCellValue();
}
return getCellNotNullText(cell.getRow().getSheet().getRow(--rowNum).getCell(index), index,
rowNum);
}
}