我尝试在现有的excel文件.But中追加数据,当我在其上写入内容时,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deleted.Just想要的解决方案,以追加数据在现有的row.This概念是用来记录我的测试脚本的执行与timestamp.whenever我运行脚本,它将写入现有的excel,以便我可以看到我执行的所有历史。
发布于 2017-05-27 21:06:12
在现有.xlsx中追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)
{
}
}
发布于 2016-03-25 22:06:49
不要以这种方式使用静态字段passRowCount
,因为value是与类而不是对象相关联的。您可以将其更改为以下循环:
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
使用了以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
。
您还可以将附加标志添加到FileOutputStream
FileOutputStream outputStream = new FileOutputStream(
new File(System.getProperty("user.dir") + "\\src\\Excel\\TestCase2.xlsx"), true);
https://stackoverflow.com/questions/36220400
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