使用java中的apache poi在现有Excel文件中附加数据
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Append Data in existing Excel file using apache poi in java
提问by DoubtClear
I am trying to append data in existing excel file .But when i write on it it delete my previous data
我试图在现有的 excel 文件中附加数据。但是当我在上面写时，它会删除我以前的数据
File excelRead
文件excel读取
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;
}
}
File MainFile
文件主文件
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
在Excel中追加数据
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);
}
}
}
Sometime whole previous excel data deleted.Just wanted solution to append data at the end of the existing row.This concept is used for to log the execution of my testscript with timestamp.whenever I run script it will write in existing excel so that i can see all history of my execution.
有时整个以前的 excel 数据被删除。只是想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测试脚本的执行和时间戳。每当我运行脚本时，它都会在现有的 excel 中写入，以便我可以查看我执行的所有历史记录。
回答by itpr
Don't use static field passRowCountin this way, because value is associated with class instead of an object. You can change it to this loops:
不要passRowCount以这种方式使用静态字段，因为值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);
}
}
}
I believe you provided only the code snippet because AppendDataInExceluse workbook never created before.
我相信您只提供了代码片段，因为AppendDataInExcel使用以前从未创建过的工作簿。
You should return Workbookinterface from readExcelmethod and pass it to AppendDataInExcel, through constructor or method.
您应该Workbook从readExcel方法返回接口并AppendDataInExcel通过构造函数或方法将其传递给, 。
You can also add append flag to FileOutputStream:
您还可以将附加标志添加到FileOutputStream：
FileOutputStream outputStream = new FileOutputStream(
new File(System.getProperty("user.dir") + "\src\Excel\TestCase2.xlsx"), true);
回答by Ashwani
The code to append data in Existing .xlsx is as simple:
在 Existing .xlsx 中追加数据的代码很简单：
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)
{
}
}
回答by Sumeet Gawas
You can add data in new row in your existing excel sheet rather then overwritting the previous data by using following java code
您可以在现有 Excel 表格的新行中添加数据，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<Row> 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();
回答by Sumeet Gawas
You can add data on new row provided you have to put this code in some loop according to your logic so that it will repeat the process and data is getting added on new row
您可以在新行上添加数据，前提是您必须根据您的逻辑将此代码放入某个循环中，以便它会重复该过程并且将数据添加到新行上
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<Row> 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();
