将 Excel 中的每个单元格数据转换为 XML 以存储到数据库

Question

在寻找一些资源后，我可以加载一个包含 1.000.000 行数据的 Excel 文件。但是，我不知道如何获取每个数据。到目前为止，这是我的代码...

public void create(MultipartFile file) throws Exception {
    try {
        InputStream fileStream = new BufferedInputStream(file.getInputStream());
        OPCPackage opc = OPCPackage.open(fileStream);
        XSSFReader xssf = new XSSFReader(opc);
        SharedStringsTable sst = xssf.getSharedStringsTable();
        XSSFReader.SheetIterator itr = (XSSFReader.SheetIterator)xssf.getSheetData();

// I just realize, if I running below for-loop,
// this only print strings and in random order, not in the same order as the excel file.
// 20 is just an example

        for (int i = 0; i < 20; i++) {
            System.out.println(sst.getEntryAt(i).getT().toString());
        }

        while (itr.hasNext()) {
            InputStream is = itr.next();
            if (itr.getSheetName().equals("MY_SHEET_NAME")) {
                while ("data is avaiable, this is just example, I'll use something like hasNext() for the row in the sheet, but I dont know how to do it" != null) {
                    // Want to process and get all data in each cells, then store to DB
                    // What I did not know, is how to get data in each cells
                }
            } else {
                throw new Exception("Sheet not found");
            }
        }
    } catch (Exception e) {
        throw new Exception("Error is: " + e.getMessage());
    } finally {
        if (is != null) {
            is.close();
        }

        if (opc != null){
            opc.close();
        }

        if (fileStream != null) {
            fileStream.close();
        }
    }
}

我试图查看 here 来处理 sheet，但我不知道如何获取每个单元格中的数据。任何帮助都会真正帮助我..

更新

如果我阅读了来自 link 的 apache POI 文档 here，将处理我的 excel 的代码部分在此处：

public void processOneSheet(String filename) throws Exception {
        OPCPackage pkg = OPCPackage.open(filename);
        XSSFReader r = new XSSFReader( pkg );
        SharedStringsTable sst = r.getSharedStringsTable();

        XMLReader parser = fetchSheetParser(sst);

        // To look up the Sheet Name / Sheet Order / rID,
        //  you need to process the core Workbook stream.
        // Normally it's of the form rId# or rSheet#
        InputStream sheet2 = r.getSheet("rId2");
        InputSource sheetSource = new InputSource(sheet2);
        parser.parse(sheetSource);
        sheet2.close();
    }

但是，在调用 parser.parse(sheetSource) 之后，我如何从每一行和每一列中获取每个数据？因为我想对每个单元格的每个数据进行验证，然后将其存储到数据库中。

更新 2 我尝试使用这个答案，。我可以获取数据，我尝试插入 myObjectRepo.save(result) 或 myObjectRepo.save(myObject)，我都将代码放在 void endRow 方法中，我也尝试在切换后立即放置它但是在 if(lineNumber > 0) 中，但它总是 return NullPointerException。但是如果我没有调用保存方法，我尝试在控制台中打印结果，打印出结果。

Answer 1

获取 excel 数据的方法之一是：

try {
        InputStream excelFile = new FileInputStream(mFileName); 
        XSSFWorkbook wb = new XSSFWorkbook(excelFile);
        XSSFSheet sheet = wb.getSheetAt(0);
        XSSFRow row;
        XSSFCell cell;

        Iterator<Row> rows = sheet.rowIterator();

        int col = 0, colPR = 1;
        int pageRank = 0;
        String url = null;

        while (rows.hasNext()) {
            row = (XSSFRow) rows.next();
            url = row.getCell(col).getStringCellValue();

            System.out.println("--------------------------");
        }

        FileOutputStream out = new FileOutputStream(mFileName);
        wb.write(out);
        out.flush();
        out.close();
    }
    catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Answer 2

好吧，我想回答我自己的问题。几经experiments/trials又以此为基础answer, I've made it to upload excel file which has at least 1.000.000 rows data and stored into db (postgresql). For upload, read and insert 1.000.000 rows data needs 5 minutes. Here is the link to the project。希望能帮到有需要的人。

将 Excel 中的每个单元格数据转换为 XML 以存储到数据库

Get each cells data from Excel converted to XML to stored to DB

java

excel

spring-boot

apache-poi

xssf