如何在JavaFX应用程序中从Excel读取数据?
问题描述：
我正在使用hibernate作为Java中的ORM创建JavaFX FXMl应用程序.我想从Excel读取数据并使用休眠将其存储到MySQL，但是无法创建工作簿.
I am creating a JavaFX FXMl application with hibernate as ORM in Java. I want to read data from Excel and store it to MySQL using hibernate, but it fails to create Workbook.
无论是在SO还是其他网站上，我都花了数小时来阅读教程和其他文章，既没有答案也没有评论对我有帮助.
I have spend hours to read tutorials and other posts whether in SO or other sites, neither accepted answers nor comments helped me.
在我的Form_Main.fxml文件中，我有一个按钮，该按钮调用相关方法以从Excel读取数据.我添加了以下JAR文件:
* poi-4.1.0
* poi-ooxml-4.1.0
* poi-ooxml-schemas-4.1.0
* xmlbeans-3.0.1
* commons-collections4-4.2
到项目.我读取数据的导入如下:
In my Form_Main.fxml file I have a button that calls related method to read data from Excel. I have added following JAR files:
* poi-4.1.0
* poi-ooxml-4.1.0
* poi-ooxml-schemas-4.1.0
* xmlbeans-3.0.1
* commons-collections4-4.2
to the project. My imports to read data are as follows:
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFRow;
我定义的方法是:
FileInputStream _File = new FileInputStream(new File("D:\\Students_Info.xlsx"));
XSSFWorkbook _Workbook = new XSSFWorkbook(_File);
XSSFSheet _Sheet = _Workbook.getSheetAt(0);
XSSFRow _Row;
其余代码将要使用休眠模式将数据写入MySQL.但这不起作用.
The rest of code is about to writing data to MySQL using hibernate. But it doesn't work.
当我调试程序时，在以下行:
When I debug my program, at line:
XSSFWorkbook _Workbook = new XSSFWorkbook(_File);
它在以下行跳至文件FXMLLoader.java:
catch (InvocationTargetException exception) {
throw new RuntimeException(exception);
}
我的堆栈跟踪(如果我正确的话)是:
My Stack Trace (if I am correct) is:
[java] Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
[java] at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
[java] at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
[java] at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
[java] at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
[java] at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
[java] at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
[java] at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
[java] at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
[java] at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
[java] at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
[java] at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
[java] at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
[java] at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
[java] at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
[java] at javafx.event.Event.fireEvent(Event.java:198)
[java] at javafx.scene.Node.fireEvent(Node.java:8411)
[java] at javafx.scene.control.Button.fire(Button.java:185)
[java] at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
[java] at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
[java] at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
[java] at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
[java] at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
[java] at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
[java] at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
[java] at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
[java] at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
[java] at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
[java] at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
[java] at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
[java] at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
[java] at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
[java] at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
[java] at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
[java] at javafx.event.Event.fireEvent(Event.java:198)
[java] at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
[java] at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
[java] at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
[java] at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
[java] at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
[java] at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$358(GlassViewEventHandler.java:432)
[java] at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:410)
[java] at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
[java] at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
[java] at com.sun.glass.ui.View.notifyMouse(View.java:937)
[java] at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
[java] at com.sun.glass.ui.win.WinApplication.lambda$null$152(WinApplication.java:177)
[java] at java.lang.Thread.run(Thread.java:748)
[java] Caused by: java.lang.reflect.InvocationTargetException
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[java] at java.lang.reflect.Method.invoke(Method.java:498)
[java] at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
[java] at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[java] at java.lang.reflect.Method.invoke(Method.java:498)
[java] at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
[java] at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
[java] ... 48 more
[java] Caused by: java.lang.NoClassDefFoundError: org/apache/commons/collections4/ListValuedMap
[java] at school_system.Model.TblStudent.importDataFromFile(TblStudent.java:107)
[java] at school_system.Controllers.Controller_Main.handleImportDataButtonAction(Controller_Main.java:34)
[java] ... 58 more
[java] Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections4.ListValuedMap
[java] at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[java] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[java] ... 60 more
答
这是我创建的用于读取EXCEL文件的实用程序.希望它能对您有所帮助. Main方法仅用于测试目的，可以删除.
Here is a utility I created to read EXCEL files. Hopefully, it can help you. The Main method is just for testing purposes and can be removed.
代码使用
List<List<String>> excelData = ExcelFileUtility.readExcelFile("fileName.xlsx");
完整代码:
Full code:
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.ss.usermodel.Cell;
import static org.apache.poi.ss.usermodel.CellType.BLANK;
import static org.apache.poi.ss.usermodel.CellType.BOOLEAN;
import static org.apache.poi.ss.usermodel.CellType.FORMULA;
import static org.apache.poi.ss.usermodel.CellType.NUMERIC;
import static org.apache.poi.ss.usermodel.CellType.STRING;
import org.apache.poi.ss.usermodel.DataFormatter;
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;
/**
*
* @author blj0011
*/
public class ExcelFileUtility
{
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
readExcelFileWithHeaderFirstRow("Copy of Database_Details_Report_AAA.xlsx", false).forEach((t) -> {
t.forEach((z) -> {
System.out.print(z + " - ");
});
System.out.println();
});
}
public static List<List<String>> readExcelFile(String fileName)
{
List<List<String>> excelContent = new ArrayList();
int columnCounter = 0;
int rowCounter = 0;
try (InputStream inputStream = new FileInputStream(fileName)) {
DataFormatter formatter = new DataFormatter();
Workbook workbook = WorkbookFactory.create(inputStream);
Sheet sheet = workbook.getSheetAt(0);
for (Row row : sheet) {
List<String> tempList = new ArrayList();
for (Cell cell : row) {
String text = formatter.formatCellValue(cell);
System.out.print(++columnCounter + ": " + text);
System.out.println(text.length());
tempList.add(text);
}
columnCounter = 0;
excelContent.add(tempList);
++rowCounter;
//Used for testing
//if (rowCounter == 5) {
// break;
//}
//System.out.println(String.join(" - ", tempList));
//System.out.println(tempList.size());
}
}
catch (IOException | EncryptedDocumentException ex) {
System.out.println(ex.toString());
}
return excelContent;
}
public static List<List<String>> readExcelFileWithHeaderFirstRow(String fileName, boolean allCellHaveData)
{
List<List<String>> sheetData = new ArrayList();
int headerCount = 0;
try (FileInputStream fis = new FileInputStream(fileName);
Workbook wb = WorkbookFactory.create(fis)) {
Sheet sheet = wb.getSheetAt(0);
for (int i = 0; i < sheet.getPhysicalNumberOfRows(); i++) {
Row row = sheet.getRow(i);
String value;
List<String> rowData = new ArrayList();
//System.out.println("\nROW " + row.getRowNum() + " has " + row.getPhysicalNumberOfCells() + " cell(s).");
//System.out.println("last cell number: " + row.getLastCellNum());
if (i == 0) {
headerCount = row.getLastCellNum();
}
for (int c = 0; c < row.getLastCellNum(); c++) {
Cell cell = row.getCell(c);
if (cell != null) {
switch (cell.getCellType()) {
case FORMULA:
value = "FORMULA value=" + cell.getCellFormula();
rowData.add(cell.getCellFormula());
break;
case NUMERIC:
value = "NUMERIC value=" + cell.getNumericCellValue();
rowData.add(Double.toString(cell.getNumericCellValue()));
break;
case STRING:
value = "STRING value=" + cell.getStringCellValue();
rowData.add(cell.getStringCellValue());
break;
case BLANK:
value = "<BLANK>";
rowData.add("");
break;
case BOOLEAN:
value = "BOOLEAN value-" + cell.getBooleanCellValue();
rowData.add(cell.getBooleanCellValue() ? "true" : "false");
break;
case ERROR:
value = "ERROR value=" + cell.getErrorCellValue();
rowData.add(Byte.toString(cell.getErrorCellValue()));
break;
default:
value = "UNKNOWN value of type " + cell.getCellType();
rowData.add(cell.getCellType().toString());
}
//System.out.println("CELL col=" + cell.getColumnIndex() + " VALUE=" + value);
}
else {
//System.out.println("CELL col=" + " VALUE=" + "<My Blank>");
rowData.add("<My Blank>");
}
}
if (!allCellHaveData) {
int currentRowCount = row.getLastCellNum();
while (currentRowCount < headerCount) {
rowData.add("<Blank end column>");
currentRowCount++;
}
}
sheetData.add(rowData);
}
}
catch (FileNotFoundException ex) {
System.out.println(ex);
}
catch (IOException ex) {
System.out.println(ex);
}
return sheetData;
}
}