add toLocation method

hutool-poi/src/main/java/cn/hutool/poi/excel/ExcelUtil.java

@@ -1,5 +1,6 @@
 package cn.hutool.poi.excel;
 
+import java.awt.Point;
 import java.io.BufferedInputStream;
 import java.io.File;
 import java.io.InputStream;
@@ -9,8 +10,10 @@ import cn.hutool.core.exceptions.DependencyException;
 import cn.hutool.core.io.FileUtil;
 import cn.hutool.core.io.IoUtil;
 import cn.hutool.core.util.ObjectUtil;
+import cn.hutool.core.util.ReUtil;
 import cn.hutool.core.util.StrUtil;
 import cn.hutool.poi.PoiChecker;
+import cn.hutool.poi.excel.cell.CellLocation;
 import cn.hutool.poi.excel.sax.Excel03SaxReader;
 import cn.hutool.poi.excel.sax.Excel07SaxReader;
 import cn.hutool.poi.excel.sax.handler.RowHandler;
@@ -560,7 +563,7 @@ public class ExcelUtil {
 			}
 			int remainder = index % 26;
 			colName.append((char) (remainder + 'A'));
-			index = (int) ((index - remainder) / 26);
+			index = (index - remainder) / 26;
 		} while (index > 0);
 		return colName.reverse().toString();
 	}
@@ -585,4 +588,18 @@ public class ExcelUtil {
 		}
 		return index;
 	}
+
+	/**
+	 * 将Excel中地址标识符（例如A11，B5）等转换为行列表示<br>
+	 * 例如：A11 -》 x:0,y:10，B5-》x:1,y:4
+	 *
+	 * @param locationRef 单元格地址标识符
+	 * @return 坐标点，x表示行，从0开始，y表示列，从0开始
+	 * @since 5.1.4
+	 */
+	public static CellLocation toLocation(String locationRef){
+		final int x = colNameToIndex(locationRef);
+		final int y = ReUtil.getFirstNumber(locationRef) -1;
+		return new CellLocation(x, y);
+	}
 }

hutool-poi/src/main/java/cn/hutool/poi/excel/ExcelWriter.java

@@ -660,7 +660,10 @@ public class ExcelWriter extends ExcelBase<ExcelWriter> {
 	public ExcelWriter merge(int firstRow, int lastRow, int firstColumn, int lastColumn, Object content, boolean isSetHeaderStyle) {
 		Assert.isFalse(this.isClosed, "ExcelWriter has been closed!");
 
-		final CellStyle style = (isSetHeaderStyle && null != this.styleSet && null != this.styleSet.headCellStyle) ? this.styleSet.headCellStyle : this.styleSet.cellStyle;
+		CellStyle style = null;
+		if(null != this.styleSet){
+			style = (isSetHeaderStyle && null != this.styleSet.headCellStyle) ? this.styleSet.headCellStyle : this.styleSet.cellStyle;
+		}
 		CellUtil.mergingCells(this.sheet, firstRow, lastRow, firstColumn, lastColumn, style);
 
 		// 设置内容
@@ -1043,7 +1046,7 @@ public class ExcelWriter extends ExcelBase<ExcelWriter> {
 		Comparator<String> aliasComparator = this.aliasComparator;
 		if (null == aliasComparator) {
 			Set<String> keySet = this.headerAlias.keySet();
-			aliasComparator = new IndexedComparator<>(keySet.toArray(new String[keySet.size()]));
+			aliasComparator = new IndexedComparator<>(keySet.toArray(new String[0]));
 			this.aliasComparator = aliasComparator;
 		}
 		return aliasComparator;

hutool-poi/src/main/java/cn/hutool/poi/excel/cell/CellLocation.java

@@ -0,0 +1,69 @@
+package cn.hutool.poi.excel.cell;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+/**
+ * 单元格位置
+ *
+ * @author Looly
+ * @since 5.1.4
+ */
+public class CellLocation implements Serializable {
+	private static final long serialVersionUID = 1L;
+
+	private int x;
+	private int y;
+
+	/**
+	 * 构造
+	 *
+	 * @param x 列号，从0开始
+	 * @param y 行号，从0开始
+	 */
+	public CellLocation(int x, int y) {
+		this.x = x;
+		this.y = y;
+	}
+
+	public int getX() {
+		return x;
+	}
+
+	public void setX(int x) {
+		this.x = x;
+	}
+
+	public int getY() {
+		return y;
+	}
+
+	public void setY(int y) {
+		this.y = y;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		final CellLocation that = (CellLocation) o;
+		return x == that.x && y == that.y;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(x, y);
+	}
+
+	@Override
+	public String toString() {
+		return "CellLocation{" +
+				"x=" + x +
+				", y=" + y +
+				'}';
+	}
+}

hutool-poi/src/test/java/cn/hutool/poi/excel/test/ExcelUtilTest.java

@@ -1,10 +1,10 @@
 package cn.hutool.poi.excel.test;
 
+import cn.hutool.poi.excel.ExcelUtil;
+import cn.hutool.poi.excel.cell.CellLocation;
 import org.junit.Assert;
 import org.junit.Test;
 
-import cn.hutool.poi.excel.ExcelUtil;
-
 public class ExcelUtilTest {
 	
 	@Test
@@ -36,4 +36,11 @@ public class ExcelUtilTest {
 		Assert.assertEquals(1, ExcelUtil.colNameToIndex("B"));
 		Assert.assertEquals(0, ExcelUtil.colNameToIndex("A"));
 	}
+
+	@Test
+	public void toLocationTest(){
+		final CellLocation a11 = ExcelUtil.toLocation("A11");
+		Assert.assertEquals(0, a11.getX());
+		Assert.assertEquals(10, a11.getY());
+	}
 }