POI操作excel （2007）抛出异常..大侠帮忙..

以下代码：packageexcel1;importjava.io.IOException;importjava.text.SimpleDateFormat;importj... 以下代码：
package excel1;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ReadExcel {
public void testPoiExcel2007(String strPath){
try{

XSSFWorkbook xwb = new XSSFWorkbook(strPath);
XSSFSheet sheet = xwb.getSheetAt(0);
XSSFRow row;
String cell;
for(int i = sheet.getFirstRowNum(); i < sheet.getPhysicalNumberOfRows(); i++){
row = sheet.getRow(i);
for(int j = row.getFirstCellNum(); j < row.getPhysicalNumberOfCells(); j++){
cell = row.getCell(j).toString();
System.out.print(cell + "\t");
}
System.out.println();
}
}catch (IOException e){
e.printStackTrace();
}
}
public static void main(String args[]){
String strPath = "e:\\b.xlsx";
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss:SS");
TimeZone t = sdf.getTimeZone();
t.setRawOffset(0);
sdf.setTimeZone(t);
long startTime = System.currentTimeMillis();
try{
ReadExcel er = new ReadExcel();
er.testPoiExcel2007(strPath);

}catch (Exception ex){
ex.printStackTrace();
}
long endTime = System.currentTimeMillis();
System.out.println(sdf.format(new Date(endTime - startTime)));
}
}

抛出的异常：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xmlbeans/XmlObject
at excel1.ReadExcel.testPoiExcel2007(ReadExcel.java:14)
at excel1.ReadExcel.main(ReadExcel.java:39)
Caused by: java.lang.ClassNotFoundException: org.apache.xmlbeans.XmlObject
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 2 more 展开

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