#

Junjie

2024-08-02 e83dacb5066a86db29dbdc232218d8aba6adc95f

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package com.zy.asrs.wms.utils;
 
import com.zy.asrs.framework.common.Cools;
import com.zy.asrs.wms.asrs.entity.MatField;
import io.swagger.annotations.ApiModelProperty;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
 
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
 
/**
 * Created by vincent on 2/17/2024
 */
public class ExcelUtil {
 
    public static void build(Workbook workbook, HttpServletResponse response) {
        response.reset();
        Utils.cors(response);
        response.setContentType("application/octet-stream; charset=utf-8");
        try {
            response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode("export", "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException ignore) {}
    }
 
    public static <T> Workbook create(List<T> list, Class<T> clz) {
        return create(list, clz, null);
    }
 
    public static <T> Workbook create(List<T> list, Class<T> clz, List<MatField> dynamicFields) {
        HSSFWorkbook workbook = new HSSFWorkbook();
        Sheet sheet = workbook.createSheet(clz.getSimpleName());
 
        Row header = sheet.createRow(0);
        Field[] fields = Cools.getAllFields(clz);
        int headerIdx = 0;
        for (Field field : fields) {
            if (Modifier.isFinal(field.getModifiers())
                    || Modifier.isStatic(field.getModifiers())
                    || Modifier.isTransient(field.getModifiers())) {
                continue;
            }
            String memo = "未知";
            if (field.isAnnotationPresent(ApiModelProperty.class)) {
                memo = field.getAnnotation(ApiModelProperty.class).value();
            }
            header.createCell(headerIdx).setCellValue(memo);
            headerIdx++;
        }
 
        //动态字段
        if(dynamicFields != null){
            for (MatField field : dynamicFields) {
                header.createCell(headerIdx).setCellValue(field.getDescribe());
                headerIdx++;
            }
        }
 
        int rowIndex = 1;
        for (T t : list) {
            Row row = sheet.createRow(rowIndex++);
 
            int cellIndex = 0;
            for (Field field : fields) {
                if (Modifier.isFinal(field.getModifiers())
                        || Modifier.isStatic(field.getModifiers())
                        || Modifier.isTransient(field.getModifiers())) {
                    continue;
                }
 
                field.setAccessible(true);  // 此行很重要，特别是字段为private时
                Object value = null;
                try {
                    value = field.get(t);
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
                if (value != null) {
                    if (value instanceof Date) {
                        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                        row.createCell(cellIndex).setCellValue(sdf.format((Date) value));
                    } else {
                        row.createCell(cellIndex).setCellValue(value.toString());
                    }
                }
                cellIndex++;
            }
 
            //动态字段
            if(dynamicFields != null){
                for (Field field : fields) {
                    if (field.getName().equals("dynamicFields")) {
                        try {
                            Map<String, Object> map = (Map<String, Object>) field.get(t);
                            for (MatField matField : dynamicFields) {
                                Object value = map.get(matField.getName());
                                if(value != null){
                                    row.createCell(cellIndex).setCellValue(value.toString());
                                    cellIndex++;
                                }
                            }
                        } catch (IllegalAccessException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
 
        }
 
        for (int i = 0; i <= fields.length; i++) {
            sheet.autoSizeColumn(i);
        }
 
        return workbook;
    }
 
 
 
}