fix(read): 修复读取Map数据时最后一列数据为空时结果及中没有空列数据的问题

修复当读取Map格式数据时，如果最后一列没有数据，那么读取到的map数据中不包含最后一列空数据的问题

Closes #3515

easyexcel-core/src/main/java/com/alibaba/excel/read/metadata/holder/ReadSheetHolder.java

@@ -63,7 +63,7 @@ public class ReadSheetHolder extends AbstractReadHolder {
     private ReadCellData<?> tempCellData;
     /**
      * Read the size of the largest head in sheet head data.
-     * see https://github.com/alibaba/easyexcel/issues/2014
+     * @see <a href="https://github.com/alibaba/easyexcel/issues/2014">https://github.com/alibaba/easyexcel/issues/2014</a>
      */
     private Integer maxNotEmptyDataHeadSize;
 

easyexcel-core/src/main/java/com/alibaba/excel/read/processor/DefaultAnalysisEventProcessor.java

@@ -1,5 +1,6 @@
 package com.alibaba.excel.read.processor;
 
+import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -91,7 +92,7 @@ private void onException(AnalysisContext analysisContext, Exception e) {
 
     private void dealData(AnalysisContext analysisContext) {
         ReadRowHolder readRowHolder = analysisContext.readRowHolder();
-        Map<Integer, ReadCellData<?>> cellDataMap = (Map)readRowHolder.getCellMap();
+        Map<Integer, ReadCellData<?>> cellDataMap = (Map) readRowHolder.getCellMap();
         readRowHolder.setCurrentRowAnalysisResult(cellDataMap);
         int rowIndex = readRowHolder.getRowIndex();
         int currentHeadRowNumber = analysisContext.readSheetHolder().getHeadRowNumber();
@@ -124,9 +125,13 @@ private void buildHead(AnalysisContext analysisContext, Map<Integer, ReadCellDat
         // Rule out empty head, and then take the largest column
         if (MapUtils.isNotEmpty(cellDataMap)) {
             cellDataMap.entrySet()
-                .stream()
-                .filter(entry -> CellDataTypeEnum.EMPTY != entry.getValue().getType())
-                .forEach(entry -> analysisContext.readSheetHolder().setMaxNotEmptyDataHeadSize(entry.getKey()));
+                    .stream()
+                    .filter(entry -> CellDataTypeEnum.EMPTY != entry.getValue().getType())
+                    // 这里的size应该要 +1,不然在 com.alibaba.excel.read.listener.ModelBuildEventListener#buildNoModel() 里面判断head size和数据index的时候会有问题，导致有头但是空cell的数据不会被设置
+                    // com/alibaba/excel/read/listener/ModelBuildEventListener.java:80
+                    // fix https://github.com/alibaba/easyexcel/issues/3515
+                    // fix https://github.com/alibaba/easyexcel/issues/2014
+                    .forEach(entry -> analysisContext.readSheetHolder().setMaxNotEmptyDataHeadSize(entry.getKey() + 1));
         }
 
         if (!HeadKindEnum.CLASS.equals(analysisContext.currentReadHolder().excelReadHeadProperty().getHeadKind())) {

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/temp/issue2014_3515/Issue3515Test.java

@@ -0,0 +1,53 @@
+package com.alibaba.easyexcel.test.temp.issue2014_3515;
+
+import com.alibaba.easyexcel.test.util.TestFileUtil;
+import com.alibaba.excel.EasyExcel;
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * issue 3515 修复单元测试
+ *
+ * @see <a href="https://github.com/alibaba/easyexcel/issues/3515">https://github.com/alibaba/easyexcel/issues/3515</a>
+ * @author nukiyoam
+ */
+@Slf4j
+public class Issue3515Test {
+
+    @Test
+    public void readWithHeadRowNumber(){
+        String fileName = String.join(File.separator, TestFileUtil.getPath(), "temp", "issue_3515", "issue_3515.xlsx");
+        List<Map<Integer, Object>> data = EasyExcel.read(fileName)
+                .sheet(0)
+                .headRowNumber(1)
+                .doReadSync();
+        Assertions.assertEquals(3, data.size());
+        data.forEach(it->{
+            Assertions.assertEquals(3,it.size());
+        });
+    }
+
+    @Test
+    public void readWithHeadList(){
+        String fileName = String.join(File.separator, TestFileUtil.getPath(), "temp", "issue_3515", "issue_3515.xlsx");
+        List<List<String>> head = new ArrayList<>();
+        head.add(Collections.singletonList("第一列"));
+        head.add(Collections.singletonList("第二列"));
+        head.add(Collections.singletonList("空列"));
+        List<Map<Integer, Object>> data = EasyExcel.read(fileName)
+                .sheet(0)
+                .head(head)
+                .doReadSync();
+        Assertions.assertEquals(3, data.size());
+        data.forEach(it->{
+            Assertions.assertEquals(3,it.size());
+        });
+    }
+}