credit-rating/zksy-admin/src/main/java/com/zksy/utils/MergeReadsExcelUtil.java

package com.zksy.utils;

import com.zksy.common.exception.ServiceException;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.text.DecimalFormat;
import java.util.*;
import java.util.regex.Pattern;


public class MergeReadsExcelUtil<T> {
    /**
     * 读取excel数据
     * @param file
     */
    public static <T> List<Map<String,String>> readExcelToObj(MultipartFile file, int headerColumn, int number, int headerLine, Class<T> classEntity) {

        Workbook wb = null;
        String fileName = file.getOriginalFilename();//获取文件名
        List<Map<String,String>> result = null;
        try {
            if (!validateExcel(fileName)) {// 验证文件名是否合格
                return null;
            }
            boolean isExcel2003 = true;// 根据文件名判断文件是2003版本还是2007版本
            if (isExcel2007(fileName)) {
                isExcel2003 = false;
            }
            if (isExcel2003) {// 当excel是2003时,创建excel2003
                wb = new HSSFWorkbook(file.getInputStream());
            } else {// 当excel是2007时,创建excel2007
                wb = new XSSFWorkbook(file.getInputStream());
            }
            result = readExcel(wb, 0, 1, 0, headerColumn, number, headerLine,classEntity);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 读取excel文件
     * @param wb
     * @param sheetIndex sheet页下标：从0开始
     * @param startReadLine 开始读取的行:从0开始
     * @param tailLine 去除最后读取的行
     */
    private static <T> List<Map<String,String>> readExcel(Workbook wb, int sheetIndex, int startReadLine, int tailLine,int headerColumn,int number,int headerLine,Class<T> classEntity) {
        Sheet sheet = wb.getSheetAt(sheetIndex);
        Row row = null;
        List<Map<String,String>> result = new ArrayList<Map<String,String>>();
        List<String> stringList = getEntityProp(classEntity);
        List<String> serialNumberColumn = new ArrayList<>();
        /*if(sheet.getRow(sheet.getFirstRowNum()).getLastCellNum() != headerColumn){
            throw new ServiceException("导入模板不正确");
        }*/
        for(int i=startReadLine; i<sheet.getLastRowNum()-tailLine+1; i++) {

            row = sheet.getRow(i);
            Map<String,String> map = new HashMap<String,String>();
            for(Cell c : row) {
                String returnStr = "";

                boolean isMerge = isMergedRegion(sheet, i, c.getColumnIndex());
                //判断是否具有合并单元格
                if(isMerge) {
                    String rs = getMergedRegionValue(sheet, row.getRowNum(), c.getColumnIndex());
                    returnStr = rs;
                }else {
                    //设置单元格类型
                    returnStr = getCellValue(c);
                }
                //将值存进list
                serialNumberColumn.add(returnStr);
                if(serialNumberColumn.contains("序号")){
                    //去掉第一列数据
                    if(c.getColumnIndex() <= headerColumn && c.getColumnIndex() >= number && i > headerLine) {
                        map.put(stringList.get(c.getColumnIndex() - 1), returnStr);
                    }
                }else{
                    //不去第一列数据
                    if(c.getColumnIndex() < headerColumn && i > headerLine) {
                        map.put(stringList.get(c.getColumnIndex()), returnStr);
                    }
                }
            }
            if(map.size() > 0) {
                result.add(map);
            }
        }
        if(result.size() > 0 && result.get(0).size() != headerColumn){
            throw new ServiceException("导入模板不正确");
        }
        return result;

    }
    //错误信息接收器
    private static String errorMsg;
    public static boolean validateExcel(String filePath) {
        if (filePath == null || !(isExcel2003(filePath) || isExcel2007(filePath))) {
            errorMsg = "文件名不是excel格式";
            return false;
        }
        return true;
    }
    // @描述：是否是2003的excel，返回true是2003
    public static boolean isExcel2003(String filePath)  {
        return filePath.matches("^.+\\.(?i)(xls)$");
    }
    //@描述：是否是2007的excel，返回true是2007
    public static boolean isExcel2007(String filePath) {
        return filePath.matches("^.+\\.(?i)(xlsx)$");
    }
    public static <T> List<String> getEntityProp(Class<T> clazz) {
        Field[] fields = clazz.getDeclaredFields();
        List<String> fieldNames = new ArrayList<>();
        for (Field field : fields) {
            fieldNames.add(field.getName());
        }
        fieldNames.remove("serialVersionUID");
        fieldNames.remove("id");
        return fieldNames;
    }

    /**
     * 获取合并单元格的值
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    public static String getMergedRegionValue(Sheet sheet, int row, int column){
        int sheetMergeCount = sheet.getNumMergedRegions();

        for(int i = 0 ; i < sheetMergeCount ; i++){
            CellRangeAddress ca = sheet.getMergedRegion(i);
            int firstColumn = ca.getFirstColumn();
            int lastColumn = ca.getLastColumn();
            int firstRow = ca.getFirstRow();
            int lastRow = ca.getLastRow();

            if(row >= firstRow && row <= lastRow){

                if(column >= firstColumn && column <= lastColumn){
                    Row fRow = sheet.getRow(firstRow);
                    Cell fCell = fRow.getCell(firstColumn);
                    return getCellValue(fCell) ;
                }
            }
        }

        return null ;
    }

    /**
     * 判断合并了行
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    private boolean isMergedRow(Sheet sheet,int row ,int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if(row == firstRow && row == lastRow){
                if(column >= firstColumn && column <= lastColumn){
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 判断指定的单元格是否是合并单元格
     * @param sheet
     * @param row 行下标
     * @param column 列下标
     * @return
     */
    private static boolean isMergedRegion(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if(row >= firstRow && row <= lastRow){
                if(column >= firstColumn && column <= lastColumn){
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * 判断sheet页中是否含有合并单元格
     * @param sheet
     * @return
     */
    private boolean hasMerged(Sheet sheet) {
        return sheet.getNumMergedRegions() > 0 ? true : false;
    }

    /**
     * 合并单元格
     * @param sheet
     * @param firstRow 开始行
     * @param lastRow 结束行
     * @param firstCol 开始列
     * @param lastCol 结束列
     */
    private void mergeRegion(Sheet sheet, int firstRow, int lastRow, int firstCol, int lastCol) {
        sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCol, lastCol));
    }

    /**
     * 获取单元格的值
     * @param cell
     * @return
     */
    public static String getCellValue(Cell cell){

        if(cell == null) {
            return "";
        }

        if(cell.getCellType() == CellType.STRING){

            return cell.getStringCellValue();

        }else if(cell.getCellType() == CellType.BOOLEAN){

            return String.valueOf(cell.getBooleanCellValue());

        }else if(cell.getCellType() == CellType.FORMULA){

            return convertToPercentage(cell);

        }else if(cell.getCellType() == CellType.NUMERIC){
            double numericValue = cell.getNumericCellValue();
            DecimalFormat df = new DecimalFormat("0"); // 设置格式化模式，保留小数点后的所有位数

            // 判断是否为科学计数法
            if(String.valueOf(numericValue).contains("E")) {
                DataFormatter dataFormatter = new DataFormatter();
                String formattedValue = dataFormatter.formatCellValue(cell); // 使用 DataFormatter 获取格式化后的值
                return formattedValue;
            }/*else if(String.valueOf(numericValue).contains("-")){
                //时间格式
                DateTimeFormatter inputFormatter = DateTimeFormatter.ofPattern("d-LLL-yyyy", Locale.CHINESE);
                LocalDate date = LocalDate.parse(cell.toString(), inputFormatter);
                return date.toString();
            } */else {
                String formattedValue = df.format(numericValue); // 格式化数值为完整形式
                return formattedValue;
            }
           /* String s = cell.getNumericCellValue() + "";
            // 去掉尾巴上的小数点0
            if (Pattern.matches(".*\\.0*", s)) {
                return s.split("\\.")[0];
            } else {
                return s;
            }*/
        }
        return "";
    }
    public static String convertToPercentage(Cell cell) {
        try {
            if (cell.getCellType() == CellType.FORMULA) {
                    String s = cell.getNumericCellValue() + "";
                    // 去掉尾巴上的小数点0
                    if (Pattern.matches(".*\\.0*", s)) {
                        return s.split("\\.")[0];
                    } else if(s.contains("E")){
                        DecimalFormat decimalFormat = new DecimalFormat("0");
                        String decimalNumber = decimalFormat.format(Double.parseDouble(s));
                        return decimalNumber;
                    }else{
                        return s;
                    }
                /*double value = cell.getNumericCellValue();
                return String.format("%.2f%%", value * 100); // 保留两位小数*/
            }
        }catch (Exception e){
            //return "0%"; // 如果不是数字类型，返回"NaN%"
        }
        return null;
    }
    /**
     * 从excel读取内容
     */
    public static void readContent(String fileName)  {
        boolean isE2007 = false;    //判断是否是excel2007格式
        if(fileName.endsWith("xlsx")) {
            isE2007 = true;
        }
        try {
            InputStream input = new FileInputStream(fileName);  //建立输入流
            Workbook wb  = null;
            //根据文件格式(2003或者2007)来初始化
            if(isE2007) {
                wb = new XSSFWorkbook(input);
            } else {
                wb = new HSSFWorkbook(input);
            }
            Sheet sheet = wb.getSheetAt(0);     //获得第一个表单
            Iterator<Row> rows = sheet.rowIterator(); //获得第一个表单的迭代器
            while (rows.hasNext()) {
                Row row = rows.next();  //获得行数据
                System.out.println("Row #" + row.getRowNum());  //获得行号从0开始
                Iterator<Cell> cells = row.cellIterator();    //获得第一行的迭代器
                while (cells.hasNext()) {
                    Cell cell = cells.next();
                    System.out.println("Cell #" + cell.getColumnIndex());
                    switch (cell.getCellType()) {   //根据cell中的类型来输出数据
                        case NUMERIC:
                            System.out.println(cell.getNumericCellValue());
                            break;
                        case STRING:
                            System.out.println(cell.getStringCellValue());
                            break;
                        case BOOLEAN:
                            System.out.println(cell.getBooleanCellValue());
                            break;
                        case FORMULA:
                            System.out.println(cell.getCellFormula());
                            break;
                        default:
                            System.out.println("unsuported sell type======="+cell.getCellType());
                            break;
                    }
                }
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

}