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我正在寫一個Java程序，它從.xlsx文件讀取並以.csv格式輸出。這是我的代碼：NoClassDefFoundError：UnsupportedFileFormatException使用java的Excel工作表使用
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
public class xlsxToCsv {
public static void main(String[] args) {
long startTime = System.currentTimeMillis();
File inputFile = new File("C:\\inputFile.xlsx");
File outputFile = new File("C:\\outputFile.csv");
xlsx(inputFile, outputFile);
long stopTime = System.currentTimeMillis();
long elapsedTime = stopTime - startTime;
System.out.println(elapsedTime);
}
private static void xlsx(File inputFile, File outputFile) {
//for storing data into CSV files
StringBuffer data = new StringBuffer();
try {
Writer w = new OutputStreamWriter(new FileOutputStream(outputFile), "UTF-8");
// Get the workbook object for XLS file
XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(inputFile));
// Get first sheet from the workbook
XSSFSheet sheet = workbook.getSheetAt(0);
Cell cell;
Row row;
// Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
while (rowIterator.hasNext())
{
row = rowIterator.next();
// For each row, iterate through each columns
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext())
{
cell = cellIterator.next();
switch (cell.getCellType())
{
case Cell.CELL_TYPE_BOOLEAN:
data.append(cell.getBooleanCellValue() + ",");
break;
case Cell.CELL_TYPE_NUMERIC:
if(DateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
System.out.println(date.toString());
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
String d = sdf.format(date);
System.out.println(d);
data.append(d + ",");
}
else if(cell.getNumericCellValue() == (int)cell.getNumericCellValue())
data.append((int)cell.getNumericCellValue() + ",");
else if(cell.getNumericCellValue() == (long)cell.getNumericCellValue())
data.append((long)cell.getNumericCellValue() + ",");
else
data.append(cell.getNumericCellValue() + ",");
break;
case Cell.CELL_TYPE_STRING:
data.append((cell.getStringCellValue()) + ",");
break;
case Cell.CELL_TYPE_BLANK:
data.append("" + ",");
break;
default:
data.append(cell + ",");
}
//data.append('\n');
}
data.append("\r\n");
}
w.write(data.toString());
w.close();
} catch(FileNotFoundException e) {
e.printStackTrace();
} catch(IOException e) {
e.printStackTrace();
}
}
}
不過，我發現了以下錯誤：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/UnsupportedFileFormatException
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at xlsxToCsv.xlsxToCsv.xlsx(xlsxToCsv.java:47)
at xlsxToCsv.xlsxToCsv.main(xlsxToCsv.java:28)
Caused by: java.lang.ClassNotFoundException: org.apache.poi.UnsupportedFileFormatException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 14 more
我已經包括以下罐子：
- 的dom4j-1.6 .jar
- poi-3.9.jar
- POI-OOXML-3.11.jar
- POI-OOXML-架構 - 3.8-20120326.jar
- 的xmlbeans-2.3.0.jar
我檢查文件格式的.xlsx，也該目錄，但我不明白是什麼問題。
我該如何刪除此錯誤？
你得到的錯誤？ –
XSSFWorkbook workbook = new XSSFWorkbook（new FileInputStream（inputFile））; –
你所有的poi版本都不一樣。添加所有來自相同版本的poi罐，即3.9。所有的jar文件都與apache poi一起提供給你的項目的類路徑。 – LittlePanda