支持自定义显示Excel属性列

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

@@ -194,6 +194,11 @@ public class ExcelUtil<T>
      */
     public Class<T> clazz;
 
+    /**
+     * 需要显示列属性
+     */
+    public String[] includeFields;
+
     /**
      * 需要排除列属性
      */
@@ -204,11 +209,20 @@ public class ExcelUtil<T>
         this.clazz = clazz;
     }
 
+    /**
+     * 仅在Excel中显示列属性
+     *
+     * @param fields 列属性名 示例[单个"name"/多个"id","name"]
+     */
+    public void showColumn(String... fields)
+    {
+        this.includeFields = fields;
+    }
+
     /**
      * 隐藏Excel中列属性
      *
      * @param fields 列属性名 示例[单个"name"/多个"id","name"]
-     * @throws Exception
      */
     public void hideColumn(String... fields)
     {
@@ -397,7 +411,7 @@ public class ExcelUtil<T>
                     Object val = this.getCellValue(row, entry.getKey());
 
                     // 如果不存在实例则新建.
-                    entity = (entity == null ? clazz.newInstance() : entity);
+                    entity = (entity == null ? clazz.getDeclaredConstructor().newInstance() : entity);
                     // 从map中得到对应列的field.
                     Field field = (Field) entry.getValue()[0];
                     Excel attr = (Excel) entry.getValue()[1];
@@ -1336,7 +1350,7 @@ public class ExcelUtil<T>
     {
         try
         {
-            Object instance = excel.handler().newInstance();
+            Object instance = excel.handler().getDeclaredConstructor().newInstance();
             Method formatMethod = excel.handler().getMethod("format", new Class[] { Object.class, String[].class, Cell.class, Workbook.class });
             value = formatMethod.invoke(instance, value, excel.args(), cell, this.wb);
         }
@@ -1488,46 +1502,86 @@ public class ExcelUtil<T>
         List<Field> tempFields = new ArrayList<>();
         tempFields.addAll(Arrays.asList(clazz.getSuperclass().getDeclaredFields()));
         tempFields.addAll(Arrays.asList(clazz.getDeclaredFields()));
-        for (Field field : tempFields)
+        if (StringUtils.isNotEmpty(includeFields))
         {
-            if (!ArrayUtils.contains(this.excludeFields, field.getName()))
+            for (Field field : tempFields)
             {
-                // 单注解
+                if (ArrayUtils.contains(this.includeFields, field.getName()) || field.isAnnotationPresent(Excels.class))
-                if (field.isAnnotationPresent(Excel.class))
                 {
-                    Excel attr = field.getAnnotation(Excel.class);
+                    addField(fields, field);
-                    if (attr != null && (attr.type() == Type.ALL || attr.type() == type))
+                }
+            }
+        }
+        else if (StringUtils.isNotEmpty(excludeFields))
+        {
+            for (Field field : tempFields)
+            {
+                if (!ArrayUtils.contains(this.excludeFields, field.getName()))
+                {
+                    addField(fields, field);
+                }
+            }
+        }
+        else
+        {
+            for (Field field : tempFields)
+            {
+                addField(fields, field);
+            }
+        }
+        return fields;
+    }
+
+    /**
+     * 添加字段信息
+     */
+    public void addField(List<Object[]> fields, Field field)
+    {
+        // 单注解
+        if (field.isAnnotationPresent(Excel.class))
+        {
+            Excel attr = field.getAnnotation(Excel.class);
+            if (attr != null && (attr.type() == Type.ALL || attr.type() == type))
+            {
+                field.setAccessible(true);
+                fields.add(new Object[] { field, attr });
+            }
+            if (Collection.class.isAssignableFrom(field.getType()))
+            {
+                subMethod = getSubMethod(field.getName(), clazz);
+                ParameterizedType pt = (ParameterizedType) field.getGenericType();
+                Class<?> subClass = (Class<?>) pt.getActualTypeArguments()[0];
+                this.subFields = FieldUtils.getFieldsListWithAnnotation(subClass, Excel.class);
+            }
+        }
+
+        // 多注解
+        if (field.isAnnotationPresent(Excels.class))
+        {
+            Excels attrs = field.getAnnotation(Excels.class);
+            Excel[] excels = attrs.value();
+            for (Excel attr : excels)
+            {
+                if (StringUtils.isNotEmpty(includeFields))
+                {
+                    if (ArrayUtils.contains(this.includeFields, field.getName() + "." + attr.targetAttr())
+                            && (attr != null && (attr.type() == Type.ALL || attr.type() == type)))
                     {
                         field.setAccessible(true);
                         fields.add(new Object[] { field, attr });
                     }
-                    if (Collection.class.isAssignableFrom(field.getType()))
-                    {
-                        subMethod = getSubMethod(field.getName(), clazz);
-                        ParameterizedType pt = (ParameterizedType) field.getGenericType();
-                        Class<?> subClass = (Class<?>) pt.getActualTypeArguments()[0];
-                        this.subFields = FieldUtils.getFieldsListWithAnnotation(subClass, Excel.class);
-                    }
                 }
-
+                else
-                // 多注解
-                if (field.isAnnotationPresent(Excels.class))
                 {
-                    Excels attrs = field.getAnnotation(Excels.class);
+                    if (!ArrayUtils.contains(this.excludeFields, field.getName() + "." + attr.targetAttr())
-                    Excel[] excels = attrs.value();
+                            && (attr != null && (attr.type() == Type.ALL || attr.type() == type)))
-                    for (Excel attr : excels)
                     {
-                        if (!ArrayUtils.contains(this.excludeFields, field.getName() + "." + attr.targetAttr())
+                        field.setAccessible(true);
-                                && (attr != null && (attr.type() == Type.ALL || attr.type() == type)))
+                        fields.add(new Object[] { field, attr });
-                        {
-                            field.setAccessible(true);
-                            fields.add(new Object[] { field, attr });
-                        }
                     }
                 }
             }
         }
-        return fields;
     }
 
     /**