java poi读取excel Workbook类错误

Question

具体问题是报错显示workbook类找不到，但是类已经导入到工程中。烦请大神帮忙看看解决。感谢！

报错信息

 严重: Servlet.service() for servlet [com.oabkdao.servlet.IndexServlet] in context with path [/oabkdao] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.apache.poi.ss.usermodel.Workbook

Servlet调用XlsMain类

 XlsMain XlsMain = new XlsMain();
 XlsMain.main(null);

XlsMain类

 package com.oabkdao.io;

import java.io.FileInputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.util.Iterator;  
import org.apache.poi.hssf.usermodel.HSSFCell;  
import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
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.xssf.usermodel.XSSFWorkbook;      

public class XlsMain {
    public static void main(String[] args) {  
        readXml("C:\\Users\\SJN\\Desktop\\国内改.xlsx");  
        System.out.println("-------------");  
        readXml("C:\\Users\\SJN\\Desktop\\国内改.xlsx");  
    }  
    public static void readXml(String fileName){  
        boolean isE2007 = false;    //判断是否是excel2007格式  
        if(fileName.endsWith("xlsx"))  
            {isE2007 = true;}  
        try {  
            InputStream input = new FileInputStream(fileName);  //建立输入流  
            Workbook wb  = null;  
            //根据文件格式(2003或者2007)来初始化  
            if(isE2007)  
            { wb = new XSSFWorkbook(input); } 
            else  
            { wb = new HSSFWorkbook(input);}
            Sheet sheet = wb.getSheetAt(0);     //获得第一个表单  
            Iterator<Row> rows = sheet.rowIterator(); //获得第一个表单的迭代器  
            while (rows.hasNext()) {  
                Row row = rows.next();  //获得行数据  
                System.out.println("Row #" + row.getRowNum());  //获得行号从0开始  
                Iterator<Cell> cells = row.cellIterator();    //获得第一行的迭代器  
                while (cells.hasNext()) {  
                    Cell cell = cells.next();  
                    System.out.println("Cell #" + cell.getColumnIndex());  
                    switch (cell.getCellType()) {   //根据cell中的类型来输出数据  
                    case HSSFCell.CELL_TYPE_NUMERIC:  
                        System.out.println(cell.getNumericCellValue());  
                        break;  
                    case HSSFCell.CELL_TYPE_STRING:  
                        System.out.println(cell.getStringCellValue());  
                        break;  
                    case HSSFCell.CELL_TYPE_BOOLEAN:  
                        System.out.println(cell.getBooleanCellValue());  
                        break;  
                    case HSSFCell.CELL_TYPE_FORMULA:  
                        System.out.println(cell.getCellFormula());  
                        break;  
                    default:  
                        System.out.println("unsuported sell type");  
                    break;  
                    }  
                }  
            }  
        } catch (IOException ex) {  
            ex.printStackTrace();  
        }  
    }  
}  

Answer 1

jar是否放到工程WEB-INF下的lib