我是一名新的java学生，我正在创建一个项目，我想使用 Jtextfields 中的一些信息写入 xls excel文件em>文件流。但是，我一直收到这个错误。每当我运行程序并尝试写入excel时，它会将excel格式更改为t
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError:
org/apache/commons/collections4/bidimap/TreeBidiMap
at org.apache.poi.hpsf.Section.<init>(Section.java:174)
at org.apache.poi.hpsf.MutableSection.<init>(MutableSection.java:41)
at org.apache.poi.hpsf.PropertySet.init(PropertySet.java:494)
at org.apache.poi.hpsf.PropertySet.<init>(PropertySet.java:196)
at org.apache.poi.hpsf.PropertySetFactory.create(PropertySetFactory.java:90)
at org.apache.poi.POIDocument.getPropertySet(POIDocument.java:225)
at org.apache.poi.POIDocument.getPropertySet(POIDocument.java:181)
at org.apache.poi.POIDocument.readProperties(POIDocument.java:150)
at org.apache.poi.POIDocument.getSummaryInformation(POIDocument.java:117)
at org.apache.poi.POIDocument.writeProperties(POIDocument.java:274)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.write(HSSFWorkbook.java:1456)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.write(HSSFWorkbook.java:1439)
at Excel.addStudent(Excel.java:109)
at addS$2.actionPerformed(addS.java:180)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at
vax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at
.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Prot
at
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThrea
at
java.awt.EventDispatchThread.pumpEventsForFilter
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.lang.ClassNotFoundException:
org.apache.commons.collections4.bidimap.TreeBidiMap
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 50 more
以下是我的一些代码：
public Excel() {
FileName = FILE_NAME;
}
public Excel(String Filepath) throws FileNotFoundException, IOException{
FileName = Filepath;
try{
POIFSFileSystem fs = new POIFSFileSystem(new
FileInputStream(FILE_NAME));
HSSFWorkbook workbook = new HSSFWorkbook(fs);
HSSFSheet sheet = workbook.getSheetAt(0);
}
catch (Exception e1) {
System.out.println(e1.getMessage());
}
}
public void addStudent(Student S1) {
String name = S1.getName();
int age = S1.getAge();
String dob = S1.getDOB();
String gender = S1.getGender();
String password = S1.getPassword();
int grade = S1.getGradeLevel();
int ID = S1.getID();
Alist assignments = S1.getAssignemnts();
try {
POIFSFileSystem fs = new POIFSFileSystem(new
FileInputStream(FILE_NAME));
HSSFWorkbook workbook = new HSSFWorkbook(fs);
HSSFSheet sheet = workbook.getSheetAt(0);
// Create Heading of Excel
Row rowHeading = sheet.createRow(0);
rowHeading.createCell(0).setCellValue("Name");
rowHeading.createCell(1).setCellValue("Age");
rowHeading.createCell(2).setCellValue("Date of Birth");
rowHeading.createCell(3).setCellValue("Gender");
rowHeading.createCell(4).setCellValue("Password");
rowHeading.createCell(5).setCellValue("Grade Level");
rowHeading.createCell(6).setCellValue("ID");
rowHeading.createCell(7).setCellValue("Assignments: ");
Row rowHeading1 = sheet.createRow(ID);
rowHeading1.createCell(0).setCellValue(name);
rowHeading1.createCell(1).setCellValue(age);
rowHeading1.createCell(2).setCellValue(dob);
rowHeading1.createCell(3).setCellValue(gender);
rowHeading1.createCell(4).setCellValue(password);
rowHeading1.createCell(5).setCellValue(grade);
rowHeading1.createCell(6).setCellValue(ID);
for(int i=0; i<7; i++){
CellStyle stylerowHeading = workbook.createCellStyle();
HSSFFont font = workbook.createFont();
font.setBold(true);
font.setFontName(HSSFFont.FONT_ARIAL);
font.setFontHeightInPoints((short) 11);
stylerowHeading.setFont(font);
stylerowHeading.setVerticalAlignment(CellStyle.ALIGN_CENTER);
rowHeading.getCell(i).setCellStyle(stylerowHeading);
}
// Autofit
for (int i=0; i<6; i++)
sheet.autoSizeColumn(i);
// Save to Excel file
FileOutputStream out = new FileOutputStream(FILE_NAME);
workbook.write(out);
out.close();
workbook.close();
System.out.println("Excel written successfully..");
} catch (Exception e1) {
System.out.println(e1.getMessage());
}
}