update 优化 重构 CellMergeStrategy 支持多级表头修复一些小问题 整理代码结构

ruoyi-common/src/main/java/com/ruoyi/common/excel/CellMergeStrategy.java

@@ -1,19 +1,20 @@
 package com.ruoyi.common.excel;
 
+import cn.hutool.core.collection.CollUtil;
+import com.alibaba.excel.annotation.ExcelProperty;
 import com.alibaba.excel.metadata.Head;
 import com.alibaba.excel.write.merge.AbstractMergeStrategy;
 import com.ruoyi.common.annotation.CellMerge;
+import com.ruoyi.common.utils.reflect.ReflectUtils;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.SneakyThrows;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.commons.collections4.CollectionUtils;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.util.CellRangeAddress;
 
 import java.lang.reflect.Field;
-import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -24,91 +25,98 @@ import java.util.Map;
  *
  * @author Lion Li
  */
-@AllArgsConstructor
 @Slf4j
 public class CellMergeStrategy extends AbstractMergeStrategy {
 
-	private List<?> list;
-	private boolean hasTitle;
+    private final List<?> list;
+    private final boolean hasTitle;
+    private int rowIndex;
 
-	@Override
-	protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
-		List<CellRangeAddress> cellList = handle(list, hasTitle);
-		// judge the list is not null
-		if (CollectionUtils.isNotEmpty(cellList)) {
-			// the judge is necessary
-			if (cell.getRowIndex() == 1 && cell.getColumnIndex() == 0) {
-				for (CellRangeAddress item : cellList) {
-					sheet.addMergedRegion(item);
-				}
-			}
-		}
-	}
+    public CellMergeStrategy(List<?> list, boolean hasTitle) {
+        this.list = list;
+        this.hasTitle = hasTitle;
+        // 行合并开始下标
+        this.rowIndex = hasTitle ? 1 : 0;
+    }
 
-	@SneakyThrows
-	private static List<CellRangeAddress> handle(List<?> list, boolean hasTitle) {
-		List<CellRangeAddress> cellList = new ArrayList<>();
-		if (CollectionUtils.isEmpty(list)) {
-			return cellList;
-		}
-		Class<?> clazz = list.get(0).getClass();
-		Field[] fields = clazz.getDeclaredFields();
-		// 有注解的字段
-		List<Field> mergeFields = new ArrayList<>();
-		List<Integer> mergeFieldsIndex = new ArrayList<>();
-		for (int i = 0; i < fields.length; i++) {
-			Field field = fields[i];
-			if (field.isAnnotationPresent(CellMerge.class)) {
-				CellMerge cm = field.getAnnotation(CellMerge.class);
-				mergeFields.add(field);
-				mergeFieldsIndex.add(cm.index() == -1 ? i : cm.index());
-			}
-		}
-		// 行合并开始下标
-		int rowIndex = hasTitle ? 1 : 0;
-		Map<Field, RepeatCell> map = new HashMap<>();
-		// 生成两两合并单元格
-		for (int i = 0; i < list.size(); i++) {
-			for (int j = 0; j < mergeFields.size(); j++) {
-				Field field = mergeFields.get(j);
-				String name = field.getName();
-				String methodName = "get" + name.substring(0, 1).toUpperCase() + name.substring(1);
-				Method readMethod = clazz.getMethod(methodName);
-				Object val = readMethod.invoke(list.get(i));
+    @Override
+    protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
+        List<CellRangeAddress> cellList = handle(list, hasTitle);
+        // judge the list is not null
+        if (CollUtil.isNotEmpty(cellList)) {
+            // the judge is necessary
+            if (cell.getRowIndex() == rowIndex && cell.getColumnIndex() == 0) {
+                for (CellRangeAddress item : cellList) {
+                    sheet.addMergedRegion(item);
+                }
+            }
+        }
+    }
 
-				int colNum = mergeFieldsIndex.get(j);
-				if (!map.containsKey(field)) {
-					map.put(field, new RepeatCell(val, i));
-				} else {
-					RepeatCell repeatCell = map.get(field);
-					Object cellValue = repeatCell.getValue();
-					if (cellValue == null || "".equals(cellValue)) {
-						// 空值跳过不合并
-						continue;
-					}
-					if (!cellValue.equals(val)) {
-						if (i - repeatCell.getCurrent() > 1) {
-							cellList.add(new CellRangeAddress(repeatCell.getCurrent() + rowIndex, i + rowIndex - 1, colNum, colNum));
-						}
-						map.put(field, new RepeatCell(val, i));
-					} else if (i == list.size() - 1) {
-						if (i > repeatCell.getCurrent()) {
-							cellList.add(new CellRangeAddress(repeatCell.getCurrent() + rowIndex, i + rowIndex, colNum, colNum));
-						}
-					}
-				}
-			}
-		}
-		return cellList;
-	}
+    @SneakyThrows
+    private List<CellRangeAddress> handle(List<?> list, boolean hasTitle) {
+        List<CellRangeAddress> cellList = new ArrayList<>();
+        if (CollUtil.isEmpty(list)) {
+            return cellList;
+        }
+        Field[] fields = ReflectUtils.getFields(list.get(0).getClass(), field -> !"serialVersionUID".equals(field.getName()));
 
-	@Data
-	@AllArgsConstructor
-	static class RepeatCell {
+        // 有注解的字段
+        List<Field> mergeFields = new ArrayList<>();
+        List<Integer> mergeFieldsIndex = new ArrayList<>();
+        for (int i = 0; i < fields.length; i++) {
+            Field field = fields[i];
+            if (field.isAnnotationPresent(CellMerge.class)) {
+                CellMerge cm = field.getAnnotation(CellMerge.class);
+                mergeFields.add(field);
+                mergeFieldsIndex.add(cm.index() == -1 ? i : cm.index());
+                if (hasTitle) {
+                    ExcelProperty property = field.getAnnotation(ExcelProperty.class);
+                    rowIndex = Math.max(rowIndex, property.value().length);
+                }
+            }
+        }
 
-		private Object value;
+        Map<Field, RepeatCell> map = new HashMap<>();
+        // 生成两两合并单元格
+        for (int i = 0; i < list.size(); i++) {
+            for (int j = 0; j < mergeFields.size(); j++) {
+                Field field = mergeFields.get(j);
+                Object val = ReflectUtils.invokeGetter(list.get(i), field.getName());
 
-		private int current;
+                int colNum = mergeFieldsIndex.get(j);
+                if (!map.containsKey(field)) {
+                    map.put(field, new RepeatCell(val, i));
+                } else {
+                    RepeatCell repeatCell = map.get(field);
+                    Object cellValue = repeatCell.getValue();
+                    if (cellValue == null || "".equals(cellValue)) {
+                        // 空值跳过不合并
+                        continue;
+                    }
+                    if (!cellValue.equals(val)) {
+                        if (i - repeatCell.getCurrent() > 1) {
+                            cellList.add(new CellRangeAddress(repeatCell.getCurrent() + rowIndex, i + rowIndex - 1, colNum, colNum));
+                        }
+                        map.put(field, new RepeatCell(val, i));
+                    } else if (i == list.size() - 1) {
+                        if (i > repeatCell.getCurrent()) {
+                            cellList.add(new CellRangeAddress(repeatCell.getCurrent() + rowIndex, i + rowIndex, colNum, colNum));
+                        }
+                    }
+                }
+            }
+        }
+        return cellList;
+    }
 
-	}
+    @Data
+    @AllArgsConstructor
+    static class RepeatCell {
+
+        private Object value;
+
+        private int current;
+
+    }
 }