udi-wms-third-java/src/main/java/com/glxp/mipsdl/util/ExcelUtil.java

package com.glxp.mipsdl.util;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.ReflectUtil;
import cn.hutool.core.util.StrUtil;
import com.glxp.mipsdl.annotation.Excel;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.*;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.*;

//@Slf4j
public class ExcelUtil<T> {
    /**
     * Excel sheet最大行数，默认65536
     */
    public static final int sheetSize = 65536;

    /**
     * 工作表名称
     */
    private String sheetName;

    /**
     * 导出类型（EXPORT:导出数据；IMPORT：导入模板）
     */
    private Excel.Type type;

    /**
     * 工作薄对象
     */
    private Workbook wb;

    /**
     * 工作表对象
     */
    private Sheet sheet;

    /**
     * 样式列表
     */
    private Map<String, CellStyle> styles;

    /**
     * 导入导出数据列表
     */
    private List<T> list;

    /**
     * 注解列表
     */
    private List<Object[]> fields;

    /**
     * 实体对象
     */
    public Class<T> clazz;

    public ExcelUtil(Class<T> clazz) {
        this.clazz = clazz;
    }

    public List<T> importExcel(InputStream is) throws Exception {
        return importExcel("", is);
    }

    public List<T> importExcel(String sheetName, InputStream is) throws Exception {
        this.type = Excel.Type.IMPORT;
        this.wb = WorkbookFactory.create(is);
        List<T> list = new ArrayList<T>();
        Sheet sheet = null;
        if (!sheetName.isEmpty()) {
            // 如果指定sheet名,则取指定sheet中的内容.
            sheet = wb.getSheet(sheetName);
        } else {
            // 如果传入的sheet名不存在则默认指向第1个sheet.
            sheet = wb.getSheetAt(0);
        }

        if (sheet == null) {
            throw new IOException("文件sheet不存在");
        }

        int rows = sheet.getPhysicalNumberOfRows();

        if (rows > 0) {
            // 定义一个map用于存放excel列的序号和field.
            Map<String, Integer> cellMap = new HashMap<String, Integer>();
            // 获取表头
            Row heard = sheet.getRow(0);
            for (int i = 0; i < heard.getPhysicalNumberOfCells(); i++) {
                Cell cell = heard.getCell(i);
                if (!StrUtil.isEmptyIfStr(cell)) {
                    String value = this.getCellValue(heard, i).toString();
                    cellMap.put(value, i);
                } else {
                    cellMap.put(null, i);
                }
            }
            // 有数据时才处理 得到类的所有field.
            Field[] allFields = clazz.getDeclaredFields();
            // 定义一个map用于存放列的序号和field.
            Map<Integer, Field> fieldsMap = new HashMap<Integer, Field>();
            for (int col = 0; col < allFields.length; col++) {
                Field field = allFields[col];
                Excel attr = field.getAnnotation(Excel.class);
                if (attr != null && (attr.type() == Excel.Type.ALL || attr.type() == type)) {
                    // 设置类的私有字段属性可访问.
                    field.setAccessible(true);
                    Integer column = cellMap.get(attr.name());
                    fieldsMap.put(column, field);
                }
            }
            for (int i = 1; i < rows; i++) {
                // 从第2行开始取数据,默认第一行是表头.
                Row row = sheet.getRow(i);
//                System.out.println("index = "+i);
                T entity = null;
                for (Map.Entry<Integer, Field> entry : fieldsMap.entrySet()) {
                    Object val = this.getCellValue(row, entry.getKey());

                    // 如果不存在实例则新建.
                    entity = (entity == null ? clazz.newInstance() : entity);
                    // 从map中得到对应列的field.
                    Field field = fieldsMap.get(entry.getKey());
                    // 取得类型,并根据对象类型设置值.
                    Class<?> fieldType = field.getType();
                    if (String.class == fieldType) {
                        String s = Convert.toStr(val);
                        if (StrUtil.endWith(s, ".0")) {
                            val = StrUtil.subBefore(s, ".0", true);
                        } else {
                            val = Convert.toStr(val);
                        }
                    } else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) {
                        val = Convert.toInt(val);
                    } else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) {
                        val = Convert.toLong(val);
                    } else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) {
                        val = Convert.toDouble(val);
                    } else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) {
                        val = Convert.toFloat(val);
                    } else if (BigDecimal.class == fieldType) {
                        val = Convert.toBigDecimal(val);
                    } else if (Date.class == fieldType) {
                        if (val instanceof String) {
                            val = com.glxp.mipsdl.util.DateUtil.parseDate(val);
                        } else if (val instanceof Double) {
                            val = org.apache.poi.ss.usermodel.DateUtil.getJavaDate((Double) val);
                        }
                    }
                    if (!StrUtil.isEmptyIfStr(fieldType)) {
                        Excel attr = field.getAnnotation(Excel.class);
                        String propertyName = field.getName();
                        if (StrUtil.isNotEmpty(attr.targetAttr())) {
                            propertyName = field.getName() + "." + attr.targetAttr();
                        } else if (StrUtil.isNotEmpty(attr.convertExp())) {
                            val = reverseByExp(String.valueOf(val), attr.convertExp());
                        }
                        ReflectUtil.setFieldValue(entity, propertyName, val);
                    }
                }
                list.add(entity);
            }
        }
        return list;
    }

    /**
     * 获取单元格值
     *
     * @param row    获取的行
     * @param column 获取单元格列号
     * @return 单元格值
     */
    public Object getCellValue(Row row, int column) {
        if (row == null) {
            return row;
        }
        Object val = "";
        try {
            Cell cell = row.getCell(column);
            if (cell != null) {
                if (cell.getCellTypeEnum() == CellType.NUMERIC || cell.getCellTypeEnum() == CellType.FORMULA) {
                    val = cell.getNumericCellValue();
                    if (HSSFDateUtil.isCellDateFormatted(cell)) {
                        val = DateUtil.getJavaDate((Double) val); // POI Excel 日期格式转换
                    } else {
                        if ((Double) val % 1 > 0) {
                            val = new DecimalFormat("0.00").format(val);
                        } else {
                            val = new DecimalFormat("0").format(val);
                        }
                    }
                } else if (cell.getCellTypeEnum() == CellType.STRING) {
                    val = cell.getStringCellValue();
                } else if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
                    val = cell.getBooleanCellValue();
                } else if (cell.getCellTypeEnum() == CellType.ERROR) {
                    val = cell.getErrorCellValue();
                }

            }
        } catch (Exception e) {
            return val;
        }
        return val;
    }

    /**
     * 反向解析值 男=0,女=1,未知=2
     *
     * @param propertyValue 参数值
     * @param converterExp  翻译注解
     * @return 解析后值
     * @throws Exception
     */
    public static String reverseByExp(String propertyValue, String converterExp) throws Exception {
        try {
            String[] convertSource = converterExp.split(",");
            for (String item : convertSource) {
                String[] itemArray = item.split("=");
                if (itemArray[1].equals(propertyValue)) {
                    return itemArray[0];
                }
            }
        } catch (Exception e) {
            throw e;
        }
        return propertyValue;
    }

}