fix alias

CHANGELOG.md

@@ -7,6 +7,7 @@
 
 ### 新特性
 * 【core   】     ListUtil、MapUtil、CollUtil增加empty方法
+* 【poi    】     调整别名策略，clearHeaderAlias和addHeaderAlias同时清除aliasComparator（issue#828@Github）
 
 ### Bug修复
 * 【json   】     修复解析JSON字符串时配置无法传递问题

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

@@ -200,7 +200,6 @@ public class ExcelWriter extends ExcelBase<ExcelWriter> {
 	 */
 	public ExcelWriter reset() {
 		resetRow();
-		this.aliasComparator = null;
 		this.headLocationCache = null;
 		return this;
 	}
@@ -426,6 +425,8 @@ public class ExcelWriter extends ExcelBase<ExcelWriter> {
 	 */
 	public ExcelWriter setHeaderAlias(Map<String, String> headerAlias) {
 		this.headerAlias = headerAlias;
+		// 新增别名时清除比较器缓存
+		this.aliasComparator = null;
 		return this;
 	}
 
@@ -437,6 +438,8 @@ public class ExcelWriter extends ExcelBase<ExcelWriter> {
 	 */
 	public ExcelWriter clearHeaderAlias() {
 		this.headerAlias = null;
+		// 清空别名时清除比较器缓存
+		this.aliasComparator = null;
 		return this;
 	}
 
@@ -467,6 +470,8 @@ public class ExcelWriter extends ExcelBase<ExcelWriter> {
 		}
 		this.headerAlias = headerAlias;
 		headerAlias.put(name, alias);
+		// 新增别名时清除比较器缓存
+		this.aliasComparator = null;
 		return this;
 	}
 

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

@@ -450,15 +450,26 @@ public class ExcelWriteTest {
 			rows.add(tempList);
 		}
 		ExcelWriter writer = ExcelUtil.getWriter("D:\\test\\multiSheet.xlsx", "正常数据");
+		writer.addHeaderAlias("1", "row1");
+		writer.addHeaderAlias("3", "row2");
+		writer.setOnlyAlias(true);
+
 		writer.write(rows, true);
 		writer.autoSizeColumnAll();
 
+		//表2
 		writer.setSheet("当前重复数据");
+		writer.clearHeaderAlias();
+		writer.addHeaderAlias("3", "行3");
+		writer.addHeaderAlias("1", "行1");
 		writer.write(rows, true);
 		writer.autoSizeColumnAll();
+
+		//表3
 		writer.setSheet("历史重复数据");
 		writer.write(rows, true);
 		writer.autoSizeColumnAll();
+
 		writer.close();
 	}