在 Java 中,使用 EasyExcel 库来处理 Excel 文件非常方便,包括合并单元格。下面我将介绍使用 EasyExcel 合并单元格的几种方式,并提供相应的代码示例。
前提条件: 为了使用 EasyExcel,你需要在项目中添加相应的依赖。下面是 Maven 和 Gradle 的依赖坐标:
Maven 依赖:
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.10</version> <!-- 最新版本请参考 EasyExcel 官方网站 -->
</dependency>
Gradle 依赖:
implementation 'com.alibaba:easyexcel:2.2.10' // 最新版本请参考 EasyExcel 官方网站
下面是三种不同的方式来合并单元格,以及每种方式的步骤流程和示例代码。
步骤流程:
ExcelWriter
对象。Sheet
对象并配置要合并的单元格范围。Sheet
的 merge
方法来合并单元格。ExcelWriter
。示例代码:
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.builder.ExcelWriterSheetBuilder;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class MergeCellsExample {
public static void main(String[] args) throws IOException {
String fileName = "merged_cells_example.xlsx";
// 准备数据
List<List<Object>> data = new ArrayList<>();
for (int i = 1; i <= 5; i++) {
List<Object> row = new ArrayList<>();
row.add("Header " + i);
row.add("Value " + i);
data.add(row);
}
// 创建 ExcelWriter 对象
try (ExcelWriter excelWriter = EasyExcel.write(new FileOutputStream(fileName)).build()) {
// 创建 Sheet 对象
WriteSheet writeSheet = EasyExcel.writerSheet("Sheet1").build();
// 合并单元格,从第一行第一列到第二行第一列
writeSheet.getSheet().merge(0, 0, 1, 0);
// 将数据写入合并后的单元格
excelWriter.write(data, writeSheet);
}
System.out.println("Excel file created successfully!");
}
}
步骤流程:
ExcelWriter
对象。Sheet
对象。MergeStrategy
来实现单元格合并策略。ExcelWriter
。示例代码:
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.merge.LoopMergeStrategy;
import com.alibaba.excel.write.metadata.WriteSheet;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class MergeStrategyExample {
public static void main(String[] args) throws IOException {
String fileName = "merge_strategy_example.xlsx";
// 准备数据
List<List<Object>> data = new ArrayList<>();
for (int i = 1; i <= 5; i++) {
List<Object> row = new ArrayList<>();
row.add("Header " + i);
row.add("Value " + i);
data.add(row);
}
// 创建 ExcelWriter 对象
try (ExcelWriter excelWriter = EasyExcel.write(new FileOutputStream(fileName)).build()) {
// 创建 Sheet 对象
WriteSheet writeSheet = EasyExcel.writerSheet("Sheet1").build();
// 配置合并策略
LoopMergeStrategy mergeStrategy = new LoopMergeStrategy(2, 0, 2, 0);
writeSheet.setWriteTableStyle(mergeStrategy);
// 将数据写入单元格
excelWriter.write(data, writeSheet);
}
System.out.println("Excel file created successfully!");
}
}
步骤流程:
ExcelWriter
对象。Sheet
对象。com.alibaba.excel.write.merge.AbstractMergeStrategy
接口中的方法。Sheet
对象中。ExcelWriter
。示例代码:
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.alibaba.excel.write.merge.AbstractMergeStrategy;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class CustomMergeStrategyExample {
public static void main(String[] args) throws IOException {
String fileName = "custom_merge_strategy_example.xlsx";
// 准备数据
List<List<Object>> data = new ArrayList<>();
for (int i = 1; i <= 5; i++) {
List<Object> row = new ArrayList<>();
row.add("Header " + i);
row.add("Value " + i);
data.add(row);
}
// 创建 ExcelWriter 对象
try (ExcelWriter excelWriter = EasyExcel.write(new FileOutputStream(fileName)).build()) {
// 创建 Sheet 对象
WriteSheet writeSheet = EasyExcel.writerSheet("Sheet1").build();
// 应用自定义合并策略
writeSheet.setCustomWriteHandler(new CustomMergeStrategy());
// 将数据写入单元格
excelWriter.write(data, writeSheet);
}
System.out.println("Excel file created successfully!");
}
static class CustomMergeStrategy extends AbstractMergeStrategy {
@Override
protected void merge(Row row, Cell cell, CellRangeAddress cellRangeAddress) {
// 自定义合并策略逻辑,这里示例是合并第一列的所有单元格
if (cellRangeAddress.getFirstColumn() == 0) {
int firstRow = cellRangeAddress.getFirstRow();
int lastRow = cellRangeAddress.getLastRow();
if (lastRow > firstRow) {
sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, 0, 0));
}
}
}
}
}
以上是三种使用 EasyExcel 合并单元格的方式,每种方式都适用于不同的场景,你可以根据自己的需求选择其中之一。在实际使用时,请根据你的数据和需求进行适当的调整和修改。