Excel注解支持自动统计数据总和

ruoyi-common/src/main/java/com/ruoyi/common/annotation/Excel.java

@@ -100,6 +100,11 @@ public @interface Excel
      */
     public String targetAttr() default "";
 
+    /**
+     * 是否自动统计数据,在最后追加一行统计数据总和
+     */
+    public boolean isStatistics() default false;
+
     /**
      * 字段类型（0：导出导入；1：仅导出；2：仅导入）
      */

ruoyi-common/src/main/java/com/ruoyi/common/utils/poi/ExcelUtil.java

@@ -16,6 +16,7 @@ import java.util.Date;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.UUID;
 import java.util.stream.Collectors;
 import org.apache.poi.hssf.usermodel.HSSFDateUtil;
@@ -103,6 +104,16 @@ public class ExcelUtil<T>
      */
     private List<Object[]> fields;
 
+    /**
+     * 统计列表
+     */
+    private Map<Integer, Double> statistics = new HashMap<Integer, Double>();
+
+    /**
+     * 数字格式
+     */
+    private static final DecimalFormat DOUBLE_FORMAT = new DecimalFormat("######0.00");
+
     /**
      * 实体对象
      */
@@ -347,6 +358,7 @@ public class ExcelUtil<T>
                 if (Type.EXPORT.equals(type))
                 {
                     fillExcelData(index, row);
+                    addStatisticsRow();
                 }
             }
             String filename = encodingFilename(sheetName);
@@ -453,6 +465,15 @@ public class ExcelUtil<T>
         headerFont.setColor(IndexedColors.WHITE.getIndex());
         style.setFont(headerFont);
         styles.put("header", style);
+        
+        style = wb.createCellStyle();
+        style.setAlignment(HorizontalAlignment.CENTER);
+        style.setVerticalAlignment(VerticalAlignment.CENTER);
+        Font totalFont = wb.createFont();
+        totalFont.setFontName("Arial");
+        totalFont.setFontHeightInPoints((short) 10);
+        style.setFont(totalFont);
+        styles.put("total", style);
 
         return styles;
     }
@@ -565,6 +586,7 @@ public class ExcelUtil<T>
                     // 设置列类型
                     setCellVo(value, attr, cell);
                 }
+                addStatisticsData(column, Convert.toStr(value), attr);
             }
         }
         catch (Exception e)
@@ -746,6 +768,53 @@ public class ExcelUtil<T>
         return Convert.toStr(method.invoke(bean, dictType, dictLabel, separator));
     }
 
+    /**
+     * 合计统计信息
+     */
+    private void addStatisticsData(Integer index, String text, Excel entity)
+    {
+        if (entity != null && entity.isStatistics())
+        {
+            Double temp = 0D;
+            if (!statistics.containsKey(index))
+            {
+                statistics.put(index, temp);
+            }
+            try
+            {
+                temp = Double.valueOf(text);
+            }
+            catch (NumberFormatException e)
+            {
+            }
+            statistics.put(index, statistics.get(index) + temp);
+        }
+    }
+
+    /**
+     * 创建统计行
+     */
+    public void addStatisticsRow()
+    {
+        if (statistics.size() > 0)
+        {
+            Cell cell = null;
+            Row row = sheet.createRow(sheet.getLastRowNum() + 1);
+            Set<Integer> keys = statistics.keySet();
+            cell = row.createCell(0);
+            cell.setCellStyle(styles.get("total"));
+            cell.setCellValue("合计");
+
+            for (Integer key : keys)
+            {
+                cell = row.createCell(key);
+                cell.setCellStyle(styles.get("total"));
+                cell.setCellValue(DOUBLE_FORMAT.format(statistics.get(key)));
+            }
+            statistics.clear();
+        }
+    }
+
     /**
      * 编码文件名
      */