无法使用Java和Apache POI写入Excel文件
这里是我的代码阅读工作正常，但是当单元格值设置和更新更改其给出的错误。 请帮忙。
我想读取每一行，并希望在每个状态添加状态
这是我的Excel工作表：
First Name Last name vinay kumar Vijay Sharma Rahul Jain Navin Jain 这是我的代码
import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.xssf.usermodel.XSSFRow; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.testng.annotations.Test; public class test extends config { public static String cellDataString = null; public static boolean cellDataBoolean = false; public static double cellDataInteger = 0; public static String cellvalue = null; public static int row, col; public static void test() { try { String fileNameWithPath = "E:\\FrameworkDocumentation.xlsx"; // Specify the path of file File src=new File(fileNameWithPath); // File src=new File(fileName); // load file FileInputStream fileInputStream = new FileInputStream(src); // Load workbook XSSFWorkbook workBook = new XSSFWorkbook(fileInputStream); // Load sheet- Here we are loading first sheetonly XSSFSheet sheet1= workBook.getSheetAt(0); Cell cell = null; for( row=0; row<=sheet1.getPhysicalNumberOfRows(); row++) { Row currentRow = sheet1.getRow(row); for(col=0; col<currentRow.getLastCellNum(); col++) { Cell currentCell = currentRow.getCell(col, Row.RETURN_NULL_AND_BLANK); /* if(currentCell==null) { System.out.print("\t null"); continue; } */ switch(currentCell.getCellType()) { case Cell.CELL_TYPE_STRING: cellvalue = currentCell.getStringCellValue(); break; case Cell.CELL_TYPE_NUMERIC: cellvalue = Double.toString(currentCell.getNumericCellValue()); break; case Cell.CELL_TYPE_BOOLEAN: cellvalue = String.valueOf(currentCell.getBooleanCellValue()); break; case Cell.CELL_TYPE_BLANK: cellvalue = null; break; } System.out.print("\t"+cellvalue); if(col==2) { keyword = cellvalue; System.out.print("("+keyword+")"); } else if(col==3) { locator_type = cellvalue; System.out.print("("+locator_type+")"); } else if(col==4) { locator = cellvalue; System.out.print("("+locator+")"); } else if (col==5) { data = cellvalue; System.out.print("("+data+")"); } } //Update the value of cell XSSFRow sheetrow = sheet1.getRow(row); // System.out.println(sheetrow); if(sheetrow == null) { sheetrow = sheet1.createRow(row); } //Update the value of cell cell = sheetrow.getCell(col); if(cell == null) { cell = sheetrow.createCell(col); } cell.setCellValue("Pass"); System.out.println("\n current cell value : "+ cell.getStringCellValue()); } fileInputStream.close(); FileOutputStream outFile =new FileOutputStream(new File(fileNameWithPath)); workBook.write(outFile); outFile.close(); System.out.println("Write Complete"); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
错误代码
FAILED: test java.lang.NullPointerException at test.test.test(test.java:55) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85) at org.testng.internal.Invoker.invokeMethod(Invoker.java:639) at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108) at org.testng.TestRunner.privateRun(TestRunner.java:773) at org.testng.TestRunner.run(TestRunner.java:623) at org.testng.SuiteRunner.runTest(SuiteRunner.java:359) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312) at org.testng.SuiteRunner.run(SuiteRunner.java:261) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185) at org.testng.TestNG.runSuitesLocally(TestNG.java:1110) at org.testng.TestNG.run(TestNG.java:1018) at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:112) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:205) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:176)
这是相同的代码，运行良好
public class updateExcel { public static void main(String[] args) { try { FileInputStream file = new FileInputStream("E:\\TechartifactExcel.xlsx"); XSSFWorkbook workbook = new XSSFWorkbook(file); XSSFSheet sheet = workbook.getSheetAt(0); Cell cell = null; for (int i=0;i<4;i++) { for(int j=2; j<4;j++) { //Update the value of cell XSSFRow sheetrow = sheet.getRow(i); if(sheetrow == null) { sheetrow = sheet.createRow(i); } //Update the value of cell cell = sheetrow.getCell(j); if(cell == null) { cell = sheetrow.createCell(j); } cell.setCellValue("Pass"); } } file.close(); FileOutputStream outFile =new FileOutputStream(new File("E:\\TechartifactExcel.xlsx")); workbook.write(outFile); outFile.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
只需将sheet1.getPhysicalNumberOfRows()replace为sheet1.getLastRowNum()或更改第一个for循环的testing以进行严格比较。
for( row=0; row <= sheet1.getLastRowNum(); row++)
要么
for( row=0; row < sheet1.getPhysicalNumberOfRows(); row++)