使用java中的apache poi在现有Excel文件中附加数据

我试图在现有的excel文件中附加数据。但是当我写上它时，它会删除我以前的数据

文件excelRead

package Excel; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import org.apache.poi.hssf.usermodel.HSSFWorkbook; 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; public class ExcelRead { static int passRowCount; int rowCount; Sheet guru99Sheet; Workbook guru99Workbook = null; public void readExcel(String filePath, String fileName, String sheetName) throws IOException, InterruptedException { // Create a object of File class to open xlsx file System.out.println(filePath + "\\" + fileName); File file = new File(filePath + "\\" + fileName); // Create an object of FileInputStream class to read excel file FileInputStream inputStream = new FileInputStream(file); // Find the file extension by spliting file name in substring and // getting only extension name String fileExtensionName = fileName.substring(fileName.indexOf(".")); // Check condition if the file is xlsx file if (fileExtensionName.equals(".xlsx")) { System.out.println("in xlsx"); // If it is xlsx file then create object of XSSFWorkbook class guru99Workbook = new XSSFWorkbook(inputStream); } // Check condition if the file is xls file else if (fileExtensionName.equals(".xls")) { // If it is xls file then create object of XSSFWorkbook class guru99Workbook = new HSSFWorkbook(inputStream); } // Read sheet inside the workbook by its name guru99Sheet = guru99Workbook.getSheet(sheetName); System.out.println("getFirstRowNum: " + guru99Sheet.getFirstRowNum()); Thread.sleep(1000); // Find number of rows in excel file rowCount = (guru99Sheet.getLastRowNum()) - (guru99Sheet.getFirstRowNum()); System.out.println("rowcount: " + rowCount); setRowCount(rowCount); // Create a loop over all the rows of excel file to read it for( int i = 1;i<rowCount;i++) { Thread.sleep(1000); // System.out.println("i: " + i); Row row = guru99Sheet.getRow(i); // System.out.println("getLastCellNum : " + row.getLastCellNum()); // Create a loop to print cell values in a row for (int j = 1; j < row.getLastCellNum(); j++) { Thread.sleep(1000); // System.out.println("j: " + j); // Print excel data in console System.out.print(row.getCell(j).getStringCellValue() + " "); // System.out.println("\n"); } System.out.println(); } } public void setRowCount(int rc){ passRowCount =rc; } public int getRowCount(){ return passRowCount; } } 

文件MainFile

  package Excel; import java.io.IOException; public class MainFile { public static void main(String[] args) throws IOException, InterruptedException { ExcelRead objExcelFile = new ExcelRead(); // Prepare the path of excel file String filePath = System.getProperty("user.dir") + "\\src\\Excel\\"; // Call read file method of the class to read data objExcelFile.readExcel(filePath, "TestCase2.xlsx", "Java Books"); AppendDataInExcel appendData = new AppendDataInExcel(); appendData.append(); } } 

AppendDataInExcel

 package Excel; import java.io.File; import java.io.FileOutputStream; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class AppendDataInExcel { ExcelRead excelRead = new ExcelRead(); public void append() { int rowc = excelRead.getRowCount(); System.out.println("rowCountIn Append: " + rowc); appendWrite(rowc); } public void appendWrite(int rowc) { Object[][] bookData = { { "geography", "ali", "e" }, { "chemistry", "Joeloch", "f" }, { "Code", "rahul", "g" }, { "phyysics", "banl", "h" }, }; for (Object[] aBook : bookData) { Row row = s.createRow(++rowc); System.out.println("Row: " + row.getRowNum()); int columnCount = 0; for (Object field : aBook) { Cell cell = row.createCell(++columnCount); if (field instanceof String) { cell.setCellValue((String) field); } else if (field instanceof Integer) { cell.setCellValue((Integer) field); } } } try { FileOutputStream outputStream = new FileOutputStream( new File(System.getProperty("user.dir") + "\\src\\Excel\\TestCase2.xlsx")); workbook.write(outputStream); System.out.println("Wrote in Excel"); } catch (Exception e) { System.out.println("Exception: " + e); } } } 

有时整个以前的excel数据被删除。只需要在现有行的末尾附加数据的解决方案。这个概念用于记录我的testscript的执行时间戳。每当我运行脚本它将写入现有的excel，这样我就可以查看我执行的所有历史记录

Answer 1

在Existing .xlsx中附加数据的代码非常简单：

 public static void write(){ try { FileInputStream myxls = new FileInputStream("poi-testt.xls"); HSSFWorkbook studentsSheet = new HSSFWorkbook(myxls); HSSFSheet worksheet = studentsSheet.getSheetAt(0); int lastRow=worksheet.getLastRowNum(); System.out.println(lastRow); Row row = worksheet.createRow(++lastRow); row.createCell(1).setCellValue("Dr.Hola"); myxls.close(); FileOutputStream output_file =new FileOutputStream(new File("poi- testt.xls")); //write changes studentsSheet.write(output_file); output_file.close(); System.out.println(" is successfully written"); } catch(Exception e) { } } 

Answer 2

不要以这种方式使用静态字段passRowCount ，因为value与类而不是对象相关联。 您可以将其更改为此循环：

 for (Object[] aBook : bookData) { Row row = s.createRow(s.getLastRowNum()+1); System.out.println("Row: " + row.getRowNum()); for (Object field : aBook) { Cell cell = row.createCell(row.getLastCellNum()); if (field instanceof String) { cell.setCellValue((String) field); } else if (field instanceof Integer) { cell.setCellValue((Integer) field); } } } 

我相信你只提供了代码片段，因为AppendDataInExcel使用之前从未创建过的工作簿。

您应该从readExcel方法返回Workbook接口，并通过构造函数或方法将其传递给AppendDataInExcel 。

您还可以向FileOutputStream添加追加标志：

 FileOutputStream outputStream = new FileOutputStream( new File(System.getProperty("user.dir") + "\\src\\Excel\\TestCase2.xlsx"), true); 

Answer 3

您可以在现有Excel工作表的新行中添加数据，而不是使用以下java代码覆盖以前的数据

 File myFile_ED = new File("your_file_path"); FileInputStream inputStream_ED = new FileInputStream(myFile_ED); XSSFWorkbook workbook_ED = new XSSFWorkbook(inputStream_ED); XSSFSheet sheet_ED = workbook_ED.getSheetAt(0); Iterator riterator_ED = sheet_ED.iterator(); Row row_ED = sheet_ED.createRow(sheet_ED.getLastRowNum()+1); if(sheet_ED.getLastRowNum()==0){ } Cell StartTime_ED = row_ED.createCell(0); StartTime_ED.setCellValue("your data"); Cell NoofDevice_ED = row_ED.createCell(1); NoofDevice_ED.setCellValue("your data"); Cell Device_ID_ED = row_ED.createCell(2); Device_ID_ED.setCellValue("your data"); FileOutputStream os_ED = new FileOutputStream(myFile_ED); workbook_ED.write(os_ED); os_ED.close(); workbook_ED.close(); inputStream_ED.close(); 

Answer 4

您可以在新行上添加数据，前提是您必须根据逻辑将此代码放入某个循环中，以便重复该过程并在新行上添加数据

 File myFile = new File("your_file_path"); FileInputStream inputStream = new FileInputStream(myFile); XSSFWorkbook workbook = new XSSFWorkbook(inputStream); System.out.println(" wb: " + workbook); XSSFSheet sheet = workbook.getSheet("your_sheet"); System.out.println("sheet: " + sheet + " wb: " + workbook); Object[][] bookData = { {"data","data", "data","data", "data", "data"}, }; int rowCount = 0; Iterator riterator = sheet.iterator(); while (riterator.hasNext()) { Row nextRow = riterator.next(); if (isColumnEmpty(sheet, 0, 0)) break; rowCount++; } for (Object[] aBook : bookData) { Row row = sheet.createRow(rowCount++); int columnCount = 0; for (Object field : aBook) { Cell cell = row.createCell(columnCount++); if (field instanceof String) { cell.setCellValue((String) field); System.out.print(cell.getStringCellValue()); } else if (field instanceof Integer) { cell.setCellValue((Integer) field); } } } // // FileOutputStream os = new FileOutputStream(myFile); workbook.write(os); os.close(); workbook.close(); inputStream.close();