前言
本文想要达到以及最终实现的效果:
要实现这种效果,包含两个部分的操作:
1. 动态表头
EasyExcel 生成 Excel 时要使表头有合并效果,可以采用**注解和非注解(动态表头)**的方法。因为要导出的数据没有实体类,所以采用动态表头的方法。表头用一个 List<List<String>>
对象来封装,其中外层 List 表示每一列的表头,内层 List 表示同一列的多行表头,当同一列或同一行的数据相同时,会进行表头的合并。
2. 数据合并
数据合并本文实现了两种方法:一是相邻行的数据相同时自动合并,二是指定要合并的行列范围。具体思路请看代码中的注释。合并相同数据行的方法与目标结果有些微差别:
pom.xml
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.6</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.22</version>
</dependency>
</dependencies>
MergeSameRowsStrategy
package com.kuang;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import lombok.Data;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
import java.util.List;
/**
* 合并相同数据行策略
*
* @author wangbo
* @since 2022年01月25日 10:16
*/
@Data
public class MergeSameRowsStrategy implements CellWriteHandler {
private int[] mergeColumnIndex;
private int mergeRowIndex;
public MergeSameRowsStrategy() {
}
public MergeSameRowsStrategy(int mergeRowIndex, int[] mergeColumnIndex) {
this.mergeRowIndex = mergeRowIndex;
this.mergeColumnIndex = mergeColumnIndex;
}
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
}
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
}
@Override
public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer integer, Boolean aBoolean) {
}
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> list, Cell cell, Head head, Integer integer, Boolean aBoolean) {
// 当前行
int curRowIndex = cell.getRowIndex();
// 当前列
int curColIndex = cell.getColumnIndex();
if (curRowIndex > mergeRowIndex) {
for (int i = 0; i < mergeColumnIndex.length; i++) {
if (curColIndex == mergeColumnIndex[i]) {
mergeWithPrevRow(writeSheetHolder, cell, curRowIndex, curColIndex);
break;
}
}
}
}
/**
* 当前单元格向上合并
*
* @param writeSheetHolder sheet保持对象
* @param cell 当前单元格
* @param curRowIndex 当前行
* @param curColIndex 当前列
*/
private void mergeWithPrevRow(WriteSheetHolder writeSheetHolder, Cell cell, int curRowIndex, int curColIndex) {
// 获取当前行的当前列的数据和上一行的当前列列数据,通过上一行数据是否相同进行合并
Object curData = cell.getCellTypeEnum() == CellType.STRING ? cell.getStringCellValue() : cell.getNumericCellValue();
Cell preCell = cell.getSheet().getRow(curRowIndex - 1).getCell(curColIndex);
Object preData = preCell.getCellTypeEnum() == CellType.STRING ? preCell.getStringCellValue() : preCell.getNumericCellValue();
// 比较当前行的第一列的单元格与上一行是否相同,相同合并当前单元格与上一行
if (curData.equals(preData)) {
Sheet sheet = writeSheetHolder.getSheet();
List<CellRangeAddress> mergedRegions = sheet.getMergedRegions();
boolean isMerged = false;
for (int i = 0; i < mergedRegions.size() && !isMerged; i++) {
CellRangeAddress cellRangeAddr = mergedRegions.get(i);
// 若上一个单元格已经被合并,则先移出原有的合并单元,再重新添加合并单元
if (cellRangeAddr.isInRange(curRowIndex - 1, curColIndex)) {
sheet.removeMergedRegion(i);
cellRangeAddr.setLastRow(curRowIndex);
sheet.addMergedRegion(cellRangeAddr);
isMerged = true;
}
}
// 若上一个单元格未被合并,则新增合并单元
if (!isMerged) {
CellRangeAddress cellRangeAddress = new CellRangeAddress(curRowIndex - 1, curRowIndex, curColIndex, curColIndex);
sheet.addMergedRegion(cellRangeAddress);
}
}
}
}
AssignRowsAndColumnsToMergeStrategy
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.merge.AbstractMergeStrategy;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
import java.util.List;
/**
* 指定合并行列范围策略
*
* @author wangbo
* @since 2022年01月21日 20:31
*/
public class AssignRowsAndColumnsToMergeStrategy extends AbstractMergeStrategy {
// 合并坐标集合
private List<CellRangeAddress> cellRangeAddresses;
// 构造
public AssignRowsAndColumnsToMergeStrategy() {
}
public AssignRowsAndColumnsToMergeStrategy(List<CellRangeAddress> cellRangeAddresses) {
this.cellRangeAddresses = cellRangeAddresses;
}
/**
* 合并操作:对每个单元格执行!!!
*
* @param sheet sheet对象
* @param cell 当前单元格
* @param head 表头对象
* @param relativeRowIndex 相关行索引
*/
@Override
protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
/*
* 合并单元格
*
* 由于merge()方法会在写每个单元格(cell)时执行,因此需要保证合并策略只被添加一次。否则如果每个单元格都添加一次
* 合并策略,则会造成重复合并。例如合并A2:A3,当cell为A2时,合并A2:A3,但是当cell为A3时,又要合并A2:A3,而此时
* 的A2已经是之前的A2和A3合并后的结果了。
* 由于此处的表头占了两行,因此数据单元格是从(2, 0)开始的,所以就对这个单元格(cell.getRowIndex() == 2 && cell.getColumnIndex() == 0)
* 添加一次合并策略就可以了。如果表头只有一行,则判断条件改为「cell.getRowIndex() == 1 && cell.getColumnIndex() == 0」就可以了。
*/
if (cell.getRowIndex() == 2 && cell.getColumnIndex() == 0) {
for (CellRangeAddress item : cellRangeAddresses) {
sheet.addMergedRegion(item);
}
}
/*
* 如果不作判断,可以使用addMergedRegionUnsafe()方法,
* 这样生成的Excel文件可以打开,只是打开时会提示内容有问题,修复后可以打开
*/
// for (CellRangeAddress item : cellRangeAddresses) {
// sheet.addMergedRegionUnsafe(item);
// }
}
}
MergeTest
import com.alibaba.excel.EasyExcel;
import com.kuang.MergeSameRowsStrategy;
import org.apache.poi.ss.util.CellRangeAddress;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* @author wangbo
* @since 2022年01月21日 20:29
*/
public class MergeTest {
private static String fileName = "D:\\" + System.currentTimeMillis() + ".xlsx";
@Test
public void test01() {
EasyExcel.write(fileName)
.head(header())
// 合并策略:合并相同数据的行。第一个参数表示从哪一行开始进行合并,由于表头占了两行,因此从第2行开始(索引从0开始)
// 第二个参数是指定哪些列要进行合并
.registerWriteHandler(new MergeSameRowsStrategy(2, new int[]{0, 1, 2, 3, 8, 9}))
// 注意:需要先调用registerWriteHandler()再调用sheet()方法才能使合并策略生效!!!
.sheet("模板")
.doWrite(data());
}
@Test
public void test02() {
// 合并策略:指定要合并的行列范围
int[][] toMergeRows = {{2, 3}, {4, 6}};
int[] toMergeColumns = {0, 1, 2, 3, 8, 9};
List<CellRangeAddress> list = new ArrayList<>();
for (int[] toMergeRow : toMergeRows) {
for (int toMergeColumn : toMergeColumns) {
list.add(new CellRangeAddress(toMergeRow[0], toMergeRow[1], toMergeColumn, toMergeColumn));
}
}
EasyExcel.write(fileName)
.head(header())
.registerWriteHandler(new AssignRowsAndColumnsToMergeStrategy(list))
.sheet("模板")
.doWrite(data());
}
/**
* 创建表头
*/
private List<List<String>> header() {
List<List<String>> headers = new ArrayList<>();
headers.add(Arrays.asList("提交人用户名", "提交人用户名"));
headers.add(Arrays.asList("提交人姓名", "提交人姓名"));
headers.add(Arrays.asList("创建时间", "创建时间"));
headers.add(Arrays.asList("更新时间", "更新时间"));
headers.add(Arrays.asList("学习经历", "时间"));
headers.add(Arrays.asList("学习经历", "学校"));
headers.add(Arrays.asList("学习经历", "专业"));
headers.add(Arrays.asList("学习经历", "学位"));
headers.add(Arrays.asList("工作单位", "工作单位"));
headers.add(Arrays.asList("国籍", "国籍"));
headers.add(Arrays.asList("获奖经历", "时间"));
headers.add(Arrays.asList("获奖经历", "何种奖励"));
return headers;
}
/**
* 创建数据
*/
private List<List<Object>> data() {
List<List<Object>> data = new ArrayList<>();
data.add(Arrays.asList("fengqingyang", "风清扬", "2022-01-25 11:08", "2022-01-25 11:08",
"2013.9 ~ 2017.7", "华山派", "剑宗", "剑宗高手", "隐居思过崖", "中国", "2015.12", "华山剑法高手"));
data.add(Arrays.asList("fengqingyang", "风清扬", "2022-01-25 11:08", "2022-01-25 11:08",
"2017.9 ~ 2020.7", "独孤求败", "独孤剑法", "剑术通神", "隐居思过崖", "中国", "2019.12", "剑法高手"));
data.add(Arrays.asList("linghuchong", "令狐冲", "2022-01-25 12:08", "2022-01-25 12:08",
"2020.9 ~ 2024.7", "华山派", "气宗", "气宗庸手", "漂泊江湖", "中国", "2022.12", "华山剑法庸手"));
data.add(Arrays.asList("linghuchong", "令狐冲", "2022-01-25 12:08", "2022-01-25 12:08",
"2024.9 ~ 2027.7", "风清扬", "独孤剑法", "剑法高手", "漂泊江湖", "中国", "2025.12", "剑法高手"));
data.add(Arrays.asList("linghuchong", "令狐冲", "2022-01-25 12:08", "2022-01-25 12:08",
"2027.9 ~ 2030.7", "少林寺", "易筋经", "内功高手", "漂泊江湖", "中国", "2029.12", "内功高手"));
return data;
}
}
参考
- EasyExcel · 语雀 (yuque.com)
- EasyExcel 动态表头生成且带合并
- easyexcel 复杂表头、动态表头、复杂数据导出(非注解方式)
- easyExcel实现动态表头的数据导出,合并单元格,列宽策略
- easyExcel 导出 合并表头 合并相同数据单元格
- easyexcel 合并单元格(非注解)
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