读取本地的EXCEL文件

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.lyjp.modules.sys.entity.FoodInspectParameterEntity;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Component
public class ExcelResolve {

    public final String XLSX = ".xlsx";
    public final String XLS = ".xls";

    /**
     * 获取Excel文件（.xls和.xlsx都支持）
     *
     * @param file
     * @return 解析excle后的Json数据
     * @throws IOException
     * @throws FileNotFoundException
     * @throws InvalidFormatException
     */
    public JSONArray readExcel(File file) throws Exception {
        int res = checkFile(file);

        if (res == 0) {
            System.out.println("File not found");
        } else if (res == 1) {
            return readXLSX(file);
        } else if (res == 2) {
            return readXLS(file);
        }
        JSONArray array = new JSONArray();
        return array;
    }

    /**
     * 判断File文件的类型
     *
     * @param file 传入的文件
     * @return 0-文件为空，1-XLSX文件，2-XLS文件，3-其他文件
     */
    public int checkFile(File file) {
        if (file == null) {
            return 0;
        }
        String flieName = file.getName();
        if (flieName.endsWith(XLSX)) {
            return 1;
        }
        if (flieName.endsWith(XLS)) {
            return 2;
        }
        return 3;
    }

    /**
     * 读取XLSX文件
     *
     * @param file
     * @return
     * @throws IOException
     * @throws InvalidFormatException
     */
    public JSONArray readXLSX(File file) throws InvalidFormatException, IOException {
        Workbook book = new XSSFWorkbook(file);
        Sheet sheet = book.getSheetAt(0);
        return read(sheet, book);
    }

    /**
     * 读取XLS文件
     *
     * @param file
     * @return
     * @throws IOException
     * @throws FileNotFoundException
     */
    public JSONArray readXLS(File file) throws FileNotFoundException, IOException {
        POIFSFileSystem poifsFileSystem = new POIFSFileSystem(new FileInputStream(file));
        Workbook book = new HSSFWorkbook(poifsFileSystem);
        Sheet sheet = book.getSheetAt(0);
        return read(sheet, book);
    }

    /**
     * 解析数据
     *
     * @param sheet 表格sheet对象
     * @param book  用于流关闭
     * @return
     * @throws IOException
     */
    public JSONArray read(Sheet sheet, Workbook book) throws IOException {
        int rowStart = sheet.getFirstRowNum();    // 首行下标
        int rowEnd = sheet.getLastRowNum();    // 尾行下标
        // 如果首行与尾行相同，表明只有一行，直接返回空数组
        if (rowStart == rowEnd) {
            book.close();
            return new JSONArray();
        }
        // 获取第一行JSON对象键
        Row firstRow = sheet.getRow(rowStart);
        int cellStart = firstRow.getFirstCellNum();
        int cellEnd = firstRow.getLastCellNum();
        Map<Integer, String> keyMap = new HashMap<>();
        for (int j = cellStart; j < cellEnd; j++) {
            keyMap.put(j, getValue(firstRow.getCell(j), rowStart, j, book, true));
        }
        // 获取每行JSON对象的值
        JSONArray array = new JSONArray();
        for (int i = rowStart + 1; i <= rowEnd; i++) {
            Row eachRow = sheet.getRow(i);
            JSONObject obj = new JSONObject();
            StringBuffer sb = new StringBuffer();
            for (int k = cellStart; k < cellEnd; k++) {
                if (eachRow != null) {
                    String val = getValue(eachRow.getCell(k), i, k, book, false);
                    sb.append(val);        // 所有数据添加到里面，用于判断该行是否为空
                    obj.put(keyMap.get(k), val);
                }
            }
            if (sb.toString().length() > 0) {
                array.add(obj);
            }
        }
        book.close();
        return array;
    }

    /**
     * 获取每个单元格的数据
     *
     * @param cell   单元格对象
     * @param rowNum 第几行
     * @param index  该行第几个
     * @param book   主要用于关闭流
     * @param isKey  是否为键：true-是，false-不是。 如果解析Json键，值为空时报错；如果不是Json键，值为空不报错
     * @return
     * @throws IOException
     */
    public String getValue(Cell cell, int rowNum, int index, Workbook book, boolean isKey) throws IOException {

        // 空白或空
        if (cell == null || cell.getCellType() == CellType._NONE) {
            if (isKey) {
                book.close();
                throw new NullPointerException(String.format("the key on row %s index %s is null ", ++rowNum, ++index));
            } else {
                return "";
            }
        }

        // 0. 数字 类型
        if (cell.getCellType() == CellType.NUMERIC) {
            if (HSSFDateUtil.isCellDateFormatted(cell)) {
                Date date = cell.getDateCellValue();
                DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                return df.format(date);
            }
            String val = cell.getNumericCellValue() + "";
            val = val.toUpperCase();
            if (val.contains("E")) {
                val = val.split("E")[0].replace(".", "");
            }
            return val;
        }

        // 1. String类型
        if (cell.getCellType() == CellType.STRING) {
            String val = cell.getStringCellValue();
            if (val == null || val.trim().length() == 0) {
                if (book != null) {
                    book.close();
                }
                return "";
            }
            //对字符串进行替换,替换成对应的字段,用户对象的接收
            val=replaceChineseToEnglish(val);
            return val.trim();
        }

        // 2. 公式 CELL_TYPE_FORMULA
        if (cell.getCellType() == CellType.FORMULA) {
            return cell.getStringCellValue();
        }

        // 4. 布尔值 CELL_TYPE_BOOLEAN
        if (cell.getCellType() == CellType.BOOLEAN) {
            return cell.getBooleanCellValue() + "";
        }

        // 5.    错误 CELL_TYPE_ERROR
        return "";
    }

    /**
     * @Author Zhang jianwei
     * @Description 将汉字替换成
     * @Date 8:40 2022/3/24
     * @Param
     * @return
     */
    private String replaceChineseToEnglish(String val) {
        if ("参数编号".equals(val)){
           return "id";
        }else if ("食品大类".equals(val)){
           return "first_kind_name";
        }else if ("食品亚类".equals(val)){
       return "second_kind_name";
        }else if ("食品品种".equals(val)){
           return "third_kind_name";
        }else if ("食品细类".equals(val)){
           return "fourth_kind_name";
        }else if ("名称".equals(val)){
           return "name";
        }else if ("分析方法名称".equals(val)){
           return "analysis_method_name";
        }else if ("创建时间".equals(val)){
           return "create_time";
        }else if ("单价".equals(val)){
           return "price";
        }
        return val;
    }

    public static void main(String[] args) {
        ExcelResolve excelResolve = new ExcelResolve();

        File f1 = new File("D:/work/1.xlsx");
        try {
            List<FoodInspectParameterEntity> foodInspectParameterEntityList= com.alibaba.fastjson.JSONObject.parseArray(excelResolve.readExcel(f1).toJSONString(),FoodInspectParameterEntity.class);
            System.out.println("查看结果!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }