任何人都可以帮助照亮这个吗？我正在尝试编写一个数据数组，以便从selenium测试脚本中擅长到下一个空行。我的代码适用于生成第一次执行excel，正确写入数据，然后第二次执行（在同一应用程序运行中），后续执行会抛出以下内容：
java.io.FileNotFoundException: TestResultData2.xls (The requested operation cannot be performed on a file with a user-mapped section open)
经过几个小时的尝试和搜索，我发现这可能与Windows问题有关（请参阅：https://bz.apache.org/bugzilla/show_bug.cgi?id=58480），但我不确定我是否遗漏了一些补救措施..大多数其他搜索显示这可能是由此引起的从没有关闭FileOutputStream但它是如此我在那里感到困惑。 请参阅以下exportDataToExcel方法。注意我尝试了很多不同的方法，但这是我最近/最经过测试的尝试。
public static void exportDataToExcel(String fileName, String tabName, String[][] data) throws FileNotFoundException, IOException, EncryptedDocumentException, InvalidFormatException, Exception
{
//Create new workbook and tab
Workbook wb;
File newFile = new File(fileName);
Sheet sheet = null;
if (newFile.exists()) {
// Load existing
wb = WorkbookFactory.create(newFile);
}else {
if (newFile.getName().endsWith(".xls")) {
wb = new HSSFWorkbook();
}else {
throw new IllegalArgumentException("Unknown file type. Please use .xls");
}
}
FileOutputStream fileOut = new FileOutputStream(newFile);
// Check if the workbook is empty or not
if (wb.getNumberOfSheets() != 0) {
for (int i = 0; i < wb.getNumberOfSheets(); i++) {
if (wb.getSheetName(i).equals(tabName)) {
sheet = wb.getSheet(tabName);
}else sheet = wb.createSheet(tabName);
}
}else {
// Create new sheet to the workbook if empty
sheet = wb.createSheet(tabName);
}
//Create 2D Cell Array
Row[] row = new Row[data.length];
Cell[][] cell = new Cell[row.length][];
//Define and Assign Cell Data from Given
for(int i = 0; i < row.length; i ++)
{
row[i] = sheet.createRow(i);
cell[i] = new Cell[data[i].length];
for(int j = 0; j < cell[i].length; j ++)
{
cell[i][j] = row[i].createCell(j);
cell[i][j].setCellValue(data[i][j]);
}
}
//Export Data
wb.write(fileOut);
fileOut.close();
wb.close();
System.out.println("File exported successfully");
}
我通过以下方式调用方法：
String data[][]= {{cpAppFN, cpAppLN, cpAppDOB, cpAppSSN}};
exportDataToExcel("TestResultData2.xls", "Results2", data);
下面的Stacktrace，供参考。
Test_ConsumerPortal Line 210 is FileOutputStream fileOut = new FileOutputStream(newFile);和Line 142 is exportDataToExcel("TestResultData2.xls", "Results2", data);在测试中。
java.io.FileNotFoundException: TestResultData2.xls (The requested operation cannot be performed on a file with a user-mapped section open)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at tests.Test_ConsumerPortal.exportDataToExcel(Test_ConsumerPortal.java:210)
at tests.Test_ConsumerPortal.Execution(Test_ConsumerPortal.java:142)
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:124)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:580)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:716)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:988)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:648)
at org.testng.TestRunner.run(TestRunner.java:505)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
at org.testng.SuiteRunner.run(SuiteRunner.java:364)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1137)
at org.testng.TestNG.runSuites(TestNG.java:1049)
at org.testng.TestNG.run(TestNG.java:1017)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)
java.io.FileNotFoundException: TestResultData2.xls (The requested operation cannot be performed on a file with a user-mapped section open)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at tests.Test_ConsumerPortal.exportDataToExcel(Test_ConsumerPortal.java:210)
at tests.Test_ConsumerPortal.Execution(Test_ConsumerPortal.java:142)
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:124)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:580)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:716)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:988)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:648)
at org.testng.TestRunner.run(TestRunner.java:505)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
at org.testng.SuiteRunner.run(SuiteRunner.java:364)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1137)
at org.testng.TestNG.runSuites(TestNG.java:1049)
at org.testng.TestNG.run(TestNG.java:1017)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)
如果还有其他信息，请告诉我。
答案 0 :(得分：2)
调用wb = WorkbookFactory.create(newFile)时，会在内部创建FileInputStream。在不关闭FileInputStream的情况下，您正在FileOutputStream呼叫FileOutputStream fileOut = new FileOutputStream(newFile);。
当您创建工作簿时，WorkbookFactory.create（newFile）`不起作用，因此第一次尝试通过。在随后的尝试中，所提到的代码路径被命中并且代码中断。
如果文件存在，解决方法是打开FileInputStream，然后将其传递到create()。完成更新Excel工作表中的值后，关闭FileInputStream并打开FileOutputStream以写入新数据。
下面的代码应该按原样运行。
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
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.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
public class ExcelDataUpdater {
public static void exportDataToExcel(String fileName, String tabName, String[][] data)
throws FileNotFoundException, IOException, EncryptedDocumentException, InvalidFormatException, Exception {
// Create new workbook and tab
FileInputStream inputStream = null;
Workbook wb;
Sheet sheet = null;
// Check the file extension
if (!fileName.endsWith(".xls")) {
throw new IllegalArgumentException("Unknown file type. Please use .xls");
}
File newFile = new File(fileName);
// If file not exists we create a new workbook
if (!newFile.exists()) {
wb = new HSSFWorkbook();
} else {
// If file exists, we open an input stream channel to it
inputStream = new FileInputStream(newFile);
// Provide the input stream to WorkbookFactory
wb = WorkbookFactory.create(inputStream);
}
// Check if the workbook is empty or not
boolean isSheetFound = false;
for (int i = 0; i < wb.getNumberOfSheets(); i++) {
if (wb.getSheetName(i).equals(tabName)) {
sheet = wb.getSheet(tabName);
isSheetFound = true;
}
}
if (!isSheetFound) {
sheet = wb.createSheet(tabName);
}
// Create 2D Cell Array
Row[] row = new Row[data.length];
Cell[][] cell = new Cell[row.length][];
// Define and Assign Cell Data from Given
for (int i = 0; i < row.length; i++) {
row[i] = sheet.createRow(i);
cell[i] = new Cell[data[i].length];
for (int j = 0; j < cell[i].length; j++) {
cell[i][j] = row[i].createCell(j);
cell[i][j].setCellValue(data[i][j]);
}
}
// If file already exists, we had opened an input stream.
// We will close this here
if (inputStream != null)
inputStream.close();
FileOutputStream outputStream = new FileOutputStream(newFile);
// Export Data
wb.write(outputStream);
outputStream.close();
wb.close();
System.out.println("File exported successfully");
}
public static void main(String[] args)
throws InvalidFormatException, EncryptedDocumentException, FileNotFoundException, IOException, Exception {
String data1[][] = { { "A", "B", "C", "D" } };
ExcelDataUpdater.exportDataToExcel("TestResultData2.xls", "Results1", data1);
String data2[][] = { { "X", "Y", "Z", "W" } };
ExcelDataUpdater.exportDataToExcel("TestResultData2.xls", "Results2", data2);
}
}
我还优化了用于检查工作表是否存在以及创建工作表的代码。