實現將xlxs轉化成csv,其中xlsx中時間格式爲2012/03/04 06:04:03 PM ，轉化後csv中時間爲時間戳

實現將xlxs轉化成csv,其中xlsx中時間格式爲2012/03/04 06:04:03 PM ，轉化後csv中時間爲時間戳

serivce

import java.util.Date;
import java.util.Map;


public interface ExcelReaderService {
    void excelReader(String basePath, String fileName,String exportDir);

    void transformCsv(String basePath,String exportDir);


}

serviceImpl

@Service
@Slf4j
public class ExcelReaderServceImpl implements ExcelReaderService {
    @Override
    public void excelReader(String basePath, String fileName, String exportDir) {

        String dir = basePath + "/" + fileName;

        log.info("訪問文件路徑-{}", dir);

        Map<String, String> exceptionReasons = new HashMap<>();

        //TODO 需要提取文件夾內所有文件
        //String path = "E:\\xxx.xlsx";
        //List<Object> listMap = EasyExcel.read(path).sheet().doReadSync();
        List<ExcelData> resultMap = new ArrayList<>();
        try {
            log.info("開始讀取文件-{}",dir);
            resultMap = EasyExcel.read(dir, ExcelData.class, new ExcelListen()).sheet().doReadSync();
        } catch (Exception e) {
            e.printStackTrace();
            exceptionReasons.put(dir, e.getMessage());
        }
        //TODO 需要提取文件名字


        List<List<Object>> datalist = new ArrayList<List<Object>>();


        Date prevDate = null;
        String prevValue = null;

        for (ExcelData result : resultMap) {
            if (result == null || result.getTime() == null) {
                continue;
            }

            // 需要根據時間過濾數據
            long time = result.getTime().getTime();
            String timeStr = ConvertTimeStampToDate.stampToStringTime(time);
            if (!StringUtils.hasText(timeStr)) {
                continue;
            }
            //2022-02-24 11:04:04
            //2022-02-24 11:04:04
            //String timeStr = "2022-02-24 11:04:04";
            Integer currMin = Integer.valueOf(timeStr.substring(timeStr.indexOf(":") + 1, timeStr.lastIndexOf(":")));
            //分鐘需要是偶數
            if (currMin % 2 != 0) {
                continue;
            }

            // 當前 時間 和值
            //Map<Date, String> currTtimeAndValueMap = filterExcel(prevDate, prevValue, result.getTime(), result.getValue());
            //
            //prevDate = result.getTime();
            //prevValue =result.getValue();
            //System.out.println(substring);

            //System.out.println();

            String value = result.getValue();

            List<Object> data = new ArrayList<Object>();
            data.add(time);
            data.add(value);

            datalist.add(data);
        }

        final String databaseDir = "root.sh.hsh.chlh.";
        String dataPointCode = fileName.substring(0, fileName.lastIndexOf("."));
        // 實現excel讀操作
        List<Object> exportData = new ArrayList<>();
        exportData.add("Time");
        exportData.add(databaseDir + dataPointCode+"(DOUBLE)");
        //TODO 路徑暫且這樣
        //String path2 = "d:/exportCsv/";
        String path2 = exportDir;

        File file = CsvUtils.createCSVFile(exportData, datalist, path2, dataPointCode);
        String fileName2 = file.getName();
        System.out.println("文件名稱：" + fileName2);
        log.info("導入時異常信息-{}", exceptionReasons.toString());
    }

    @Override
    public void transformCsv(String basePath, String exportDir) {

        File dir = new File(basePath);

        List<File> allFileList = new ArrayList<>();

        // 判斷文件夾是否存在
        if (!dir.exists()) {
            System.out.println("目錄不存在");
            return;
        }

        getAllFile(dir, allFileList);

        //導出文件夾目錄
        File export = new File(exportDir);

        List<File> allExprotFileList = new ArrayList<>();

        // 判斷文件夾是否存在
        if (!export.exists()) {
            System.out.println("目錄不存在");
            return;
        }

        getAllFile(export, allExprotFileList);


        /**
         * 提取源文件夾和導出文件夾名稱對比，已存在的跳過
         */

        List<String> allExprotFileListNames = new ArrayList<>();
        if (!CollectionUtils.isEmpty(allExprotFileList)) {
            for (File file : allExprotFileList) {
                String name = file.getName().substring(0, file.getName().lastIndexOf("."));
                allExprotFileListNames.add(name);
            }
        }


        for (File file : allFileList) {
            String name = null;
            if (file == null) {
                log.info("當前文件爲空-{}", file);
                continue;
            } else {
                name = file.getName().substring(0, file.getName().lastIndexOf("."));
            }


            if (!CollectionUtils.isEmpty(allExprotFileListNames) && allExprotFileListNames.contains(name)) {
                log.info("當前文件在導出文件夾中已經存在,跳過，-{}-{}-{}", file.getName(), exportDir, file.getName());
                continue;
            }


            log.info("當前訪問的文件-{}", file.getName());
            excelReader(basePath, file.getName(), exportDir);
        }
    }

  
    public static void getAllFile(File fileInput, List<File> allFileList) {
        // 獲取文件列表
        File[] fileList = fileInput.listFiles();
        assert fileList != null;
        for (File file : fileList) {
            if (file.isDirectory()) {
                // 遞歸處理文件夾
                // 如果不想統計子文件夾則可以將下一行註釋掉
                getAllFile(file, allFileList);
            } else {
                // 如果是文件則將其加入到文件數組中
                allFileList.add(file);
            }
        }
    }


}

excel對應的model

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

import java.util.Date;


@Data
public class ExcelData {

    // 設置excel表頭名稱
    //@ExcelProperty(value = "",index = 0)
    //private String a;
    //
    //@ExcelProperty(value = "",index = 1)
    //private String b;
    //
    //@ExcelProperty(value = "",index = 2)
    //private String c;

    //
    //@ExcelProperty(value = "到期日", index = 3)
    //private Date time;
    //
    //
    //@ExcelProperty(value = "",index = 4)
    //private String value;


    @ExcelProperty(value = "到期日", index = 0)
    private Date time;


    @ExcelProperty(value = "",index = 1)
    private String value;

    //@ExcelProperty(value = "",index = 5)
    //private String f;
}

單元測試用例

    @Test
    void testExeclReader() {
        String basePath = "D:/temp";
        String fileName = "xxx.xlsx";
        String exportDir = "D:/temp/";
        excelReaderService.excelReader(basePath, fileName, exportDir);
    }

依賴

        <dependency>
            <groupId>com.opencsv</groupId>
            <artifactId>opencsv</artifactId>
            <version>5.6</version>
        </dependency>
		
		
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.1.3</version>
        </dependency>