增加导出模板必填、备注 增加单独的导出模板 方法

liyang

2024-12-11 ff76df9ae0f2383db903bab3efc6ef1223d0d071

 ruoyi-common/ruoyi-common-excel/src/main/java/org/dromara/common/excel/utils/ExcelUtil.java

@@ -16,14 +16,20 @@
import lombok.NoArgsConstructor;
import org.dromara.common.core.utils.StringUtils;
import org.dromara.common.core.utils.file.FileUtils;
import org.dromara.common.core.utils.reflect.ReflectUtils;
import org.dromara.common.excel.annotation.ExcelNotation;
import org.dromara.common.excel.annotation.ExcelRequired;
import org.dromara.common.excel.convert.ExcelBigNumberConvert;
import org.dromara.common.excel.core.*;
import org.dromara.common.excel.handler.DataWriteHandler;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@@ -433,4 +439,91 @@
        return IdUtil.fastSimpleUUID() + "_" + filename + ".xlsx";
    }

    /**
     * 获取必填列Map
     *
     * @param clazz 类class
     * @return java.util.Map<java.lang.Integer, java.lang.Short>
     * @author SunLingDa
     * @date 2022/11/3 13:23
     */
    private static Map<Integer, Short> getRequiredMap(Class<?> clazz) {
        Map<Integer, Short> requiredMap = new HashMap<>();
        Field[] fields = clazz.getDeclaredFields();
        // 检查 fields 数组是否为空
        if (fields.length == 0) {
            return requiredMap;
        }
        Field[] filteredFields = ReflectUtils.getFields(clazz, field -> !"serialVersionUID".equals(field.getName()));

        for (int i = 0; i < filteredFields.length; i++) {
            Field field = filteredFields[i];
            if (!field.isAnnotationPresent(ExcelRequired.class)) {
                continue;
            }
            ExcelRequired excelRequired = field.getAnnotation(ExcelRequired.class);
            int columnIndex =  excelRequired.index() == -1 ? i : excelRequired.index();
            requiredMap.put(columnIndex, excelRequired.fontColor().getIndex());
        }
        return requiredMap;
    }

    /**
     * 获取批注Map
     *
     * @param clazz 类class
     * @return java.util.Map<java.lang.Integer, java.lang.String>
     * @author SunLingDa
     * @date 2022/11/3 13:24
     */
    private static Map<Integer, String> getNotationMap(Class<?> clazz) {
        Map<Integer, String> notationMap = new HashMap<>();
        Field[] fields = clazz.getDeclaredFields();
        // 检查 fields 数组是否为空
        if (fields.length == 0) {
            return notationMap;
        }
        Field[] filteredFields = ReflectUtils.getFields(clazz, field -> !"serialVersionUID".equals(field.getName()));
        for (int i = 0; i < filteredFields.length; i++) {
            Field field = filteredFields[i];
            if (!field.isAnnotationPresent(ExcelNotation.class)) {
                continue;
            }
            ExcelNotation excelNotation = field.getAnnotation(ExcelNotation.class);
            int columnIndex =  excelNotation.index() == -1 ? i : excelNotation.index();
            notationMap.put(columnIndex, excelNotation.value());
        }
        return notationMap;
    }
    public static <T> void exportExcelRequire(List<T> list, String sheetName, Class<T> clazz,HttpServletResponse response) {
        exportExcelTemplate(list,sheetName,clazz,response);
    }
    /**
     * 导出excel模板
     *
     * @param list      导出数据集合
     * @param sheetName 工作表的名称
     * @param clazz     实体类
     * @param response  响应体
     */
    public static <T> void exportExcelTemplate(List<T> list, String sheetName, Class<T> clazz, HttpServletResponse response) {
        try {
            Map<Integer, Short> requiredMap = getRequiredMap(clazz);
            Map<Integer, String> notationMap = getNotationMap(clazz);
            resetResponse(sheetName, response);
            ServletOutputStream os = response.getOutputStream();
            DataWriteHandler writeHandler = new DataWriteHandler(notationMap, requiredMap);
            ExcelWriterSheetBuilder builder = EasyExcel.write(os, clazz)
                .autoCloseStream(false)
                // 自动适配
                .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy())
                .registerWriteHandler(writeHandler)
                // 大数值自动转换 防止失真
                .registerConverter(new ExcelBigNumberConvert())
                .sheet(sheetName);
            builder.doWrite(list);
        } catch (IOException e) {
            throw new RuntimeException("导出Excel异常");
        }
    }
}