xlsx.Testpoi Maven / Gradle / Ivy

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package xlsx;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

public class Testpoi {

    public static void main(String[] args) {
        Workbook wb = null;
        Sheet sheet = null;
        Row row = null;
        List> list = null;
        String cellData = null;
        String filePath = "/Users/unclewang/Idea_Projects/expert/src/main/resources/2.xlsx";
        String[] columns = {"姓名", "单位", "所在学科","研究方向"};
        wb = readExcel(filePath);
        if (wb != null) {
            //用来存放表中数据
            list = new ArrayList<>();
            //获取第一个sheet
            sheet = wb.getSheetAt(0);
            //获取最大行数
            int rownum = sheet.getPhysicalNumberOfRows();
            //获取第一行
            row = sheet.getRow(0);
            //获取最大列数
            int colnum = row.getPhysicalNumberOfCells();
            for (int i = 2; i < rownum; i++) {
                Map map = new LinkedHashMap();
                row = sheet.getRow(i);
                if (row != null) {
                    for (int j = 0; j < columns.length; j++) {
                        cellData = (String) getCellFormatValue(row.getCell(j+1));
                        map.put(columns[j], cellData);
                    }
                } else {
                    break;
                }
                list.add(map);
            }
        }
        //遍历解析出来的list
        for (Map map : list) {
            for (Entry entry : map.entrySet()) {
                System.out.print(entry.getKey() + ":" + entry.getValue() + ",");
            }
            System.out.println();
        }

    }

    //读取excel
    public static Workbook readExcel(String filePath) {
        Workbook wb = null;
        if (filePath == null) {
            return null;
        }
        String extString = filePath.substring(filePath.lastIndexOf("."));
        InputStream is = null;
        try {
            is = new FileInputStream(filePath);
            if (".xls".equals(extString)) {
                wb = new HSSFWorkbook(is);
            } else if (".xlsx".equals(extString)) {
                wb = new XSSFWorkbook(is);
            } else {
                wb = null;
            }

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return wb;
    }

    public static Object getCellFormatValue(Cell cell) {
        Object cellValue = null;
        if (cell != null) {
            //判断cell类型
            switch (cell.getCellType()) {
                case Cell.CELL_TYPE_NUMERIC: {
                    cellValue = String.valueOf(cell.getNumericCellValue());
                    break;
                }
                case Cell.CELL_TYPE_FORMULA: {
                    //判断cell是否为日期格式
                    if (DateUtil.isCellDateFormatted(cell)) {
                        //转换为日期格式YYYY-mm-dd
                        cellValue = cell.getDateCellValue();
                    } else {
                        //数字
                        cellValue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                }
                case Cell.CELL_TYPE_STRING: {
                    cellValue = cell.getRichStringCellValue().getString();
                    break;
                }
                default:
                    cellValue = "";
            }
        } else {
            cellValue = "";
        }
        return cellValue;
    }
}