Chuyển csv sang xls/xlsx bằng Apache poi?

Question

Tôi cần chuyển đổi csv thành xls/xlsx trong dự án của mình? Làm thế nào tôi có thể làm điều đó? Bất cứ ai có thể gửi cho tôi một số ví dụ? Tôi muốn làm điều đó với Apache poi. Tôi cũng cần tạo một ô từ phía java.

Answer 1

Bạn có thể thử phương pháp sau để tạo tệp xlsx bằng apache-poi.

public static void csvToXLSX() { 
    try { 
     String csvFileAddress = "test.csv"; //csv file address 
     String xlsxFileAddress = "test.xlsx"; //xlsx file address 
     XSSFWorkbook workBook = new XSSFWorkbook(); 
     XSSFSheet sheet = workBook.createSheet("sheet1"); 
     String currentLine=null; 
     int RowNum=0; 
     BufferedReader br = new BufferedReader(new FileReader(csvFileAddress)); 
     while ((currentLine = br.readLine()) != null) { 
      String str[] = currentLine.split(","); 
      RowNum++; 
      XSSFRow currentRow=sheet.createRow(RowNum); 
      for(int i=0;i<str.length;i++){ 
       currentRow.createCell(i).setCellValue(str[i]); 
      } 
     } 

     FileOutputStream fileOutputStream = new FileOutputStream(xlsxFileAddress); 
     workBook.write(fileOutputStream); 
     fileOutputStream.close(); 
     System.out.println("Done"); 
    } catch (Exception ex) { 
     System.out.println(ex.getMessage()+"Exception in try"); 
    } 
} 

Answer 2

Chúng ta có thể sử dụng SXSSF Jar trong đó chúng ta có thể phân tích một tập tin dài như sau:

public static void main(String[] args) { 
    try { 

    // String fName = args[ 0 ]; 

    String csvFileAddress = "C:\\Users\\psingh\\Desktop\\test\\New folder\\GenericDealerReport - version6.txt"; //csv file address 
    String xlsxFileAddress = "C:\\Users\\psingh\\Desktop\\trial\\test3.xlsx"; //xlsx file address 

    SXSSFWorkbook workBook = new SXSSFWorkbook(1000); 
    org.apache.poi.ss.usermodel.Sheet sheet = workBook.createSheet("sheet1"); 
    String currentLine = null; 
    int RowNum = -1; 
    BufferedReader br = new BufferedReader(new FileReader(csvFileAddress)); 
    while ((currentLine = br.readLine()) != null) { 
     String str[] = currentLine.split("\\|"); 
     RowNum++; 
     Row currentRow = sheet.createRow(RowNum); 
     for (int i = 0; i < str.length; i++) { 
     currentRow.createCell(i) 
       .setCellValue(str[ i ]); 
     } 
    } 
    DateFormat df = new SimpleDateFormat("yyyy-mm-dd-HHmmss"); 
    Date today = Calendar.getInstance() 
         .getTime(); 
    String reportDate = df.format(today); 
    FileOutputStream fileOutputStream = new FileOutputStream(xlsxFileAddress); 
    workBook.write(fileOutputStream); 
    fileOutputStream.close(); 
    //System.out.println("Done"); 
    } 
    catch (Exception ex) { 
    System.out.println(ex.getMessage() + "Exception in try"); 
    } 
} 

Answer 3

Tôi đã tìm thấy SXSSFWorkbook thực sự nhanh hơn sau đó XSSFWorkbook. Đây là mã chỉnh sửa:

try { 
     String csvFileInput = "inputFile.csv"; 
     String xlsxFileOutput ="outputFile.xls"; 

     LOGGER.error(csvFileInput); 
     LOGGER.error(xlsxFileOutput); 
     SXSSFWorkbook workBook = new SXSSFWorkbook(); 
     Sheet sheet = workBook.createSheet(transformBean.getOutputFileName()); 
     String currentLine = null; 
     int RowNum = 0; 
     BufferedReader br = new BufferedReader(new FileReader(csvFileInput)); 
     while ((currentLine = br.readLine()) != null) { 
      String str[] = currentLine.split(","); 
      RowNum++; 
      Row currentRow = sheet.createRow(RowNum); 
      for (int i = 0; i < str.length; i++) { 
       currentRow.createCell(i).setCellValue(str[i]); 
      } 
     } 
     FileOutputStream fileOutputStream = new FileOutputStream(xlsxFileOutput); 
     workBook.write(fileOutputStream); 
     fileOutputStream.close(); 
     System.out.println("Done"); 
    } catch (Exception ex) { 
     System.out.println(ex.getMessage() + "Found Exception"); 
    } 

Answer 4

if(new File(newFileName).isFile()) return; 
    @SuppressWarnings("resource") 
    HSSFWorkbook wb = new HSSFWorkbook(); 
    Row xlsRow; 
    Cell xlsCell; 
    HSSFSheet sheet = wb.createSheet("sheet1"); 
    int rowIndex = 0; 
    for(CSVRecord record : CSVFormat.EXCEL.parse(new FileReader(fileName))) { 
     xlsRow = sheet.createRow(rowIndex); 
     for(int i = 0; i < record.size(); i ++){ 
      xlsCell = xlsRow.createCell(i); 
      xlsCell.setCellValue(record.get(i)); 
     } 
     rowIndex ++; 
    } 
    FileOutputStream out = new FileOutputStream(newFileName); 
    wb.write(out); 
    out.close(); 

Answer 5

Hãy thử một trong này nếu bạn có inputstream public static XSSFWorkbook csvToXLSX (InputStream InputStream) throws IOException { XSSFWorkbook Workbook = new XSSFWorkbook();

try(BufferedReader br = new BufferedReader(new InputStreamReader(inputStream))) { 
     Sheet sheet = workBook.createSheet("sheet1"); 
     String currentLine=null; 
     int rowNum=0; 

     while ((currentLine = br.readLine()) != null) { 
      String[] str = currentLine.split(","); 
      rowNum++; 
      Row currentRow=sheet.createRow(rowNum); 
      for(int i=0;i<str.length;i++){ 
       currentRow.createCell(i).setCellValue(str[i]); 
      } 
     } 

     log.info("CSV file converted to the workbook"); 
     return workBook; 
    } catch (Exception ex) { 
     log.error("Exception while converting csv to xls {}",ex); 
    }finally { 
     if (Objects.nonNull(workBook)) { 
      workBook.close(); 
     } 
    } 
    return workBook; 
}