Java Excel读取数据

1）pom.xml

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>

2. java代码

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;

public class Testpoi {

    public static void main(String[] args) {
        List<Map<String, String>> list = getList();
        for (Map<String, String> map : list) {
            System.out.println(map);
        }
    }

    public static List<Map<String, String>> getList() {
        Workbook wb = null;
        Sheet sheet = null;
        Row row = null;
        List<Map<String, String>> list = null;
        String cellData = null;
        String filePath = "/Users/xxx/Desktop/qaz.xlsx";
        String columns[] = { "type", "bf", "city", "name", "bz" };
        wb = readExcel(filePath);
        if (wb != null) {
            // 用来存放表中数据
            list = new ArrayList<Map<String, String>>();
            // 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 = 1; i < rownum; i++) {
                Map<String, String> map = new LinkedHashMap<String, String>();
                row = sheet.getRow(i);
                if (row != null) {
                    for (int j = 0; j < colnum; j++) {
                        cellData = (String) getCellFormatValue(row.getCell(j));
                        map.put(columns[j], cellData);
                    }
                } else {
                    break;
                }
                list.add(map);
            }
        }
        return list;
    }

    // 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)) {
                return wb = new HSSFWorkbook(is);
            } else if (".xlsx".equals(extString)) {
                return wb = new XSSFWorkbook(is);
            } else {
                return 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;
    }
}