导入导出EXCEL数据（jsp+ssh）

http://iteamsky.blog.51cto.com/3076504/610156

另外的方法：

项目结构：
http: //www.cnblogs.com/hongten/gallery/image/111987.html
用到的Excel文件：
http: //www.cnblogs.com/hongten/gallery/image/111988.html

XlsMain .java 类
//该类有main方法，主要负责运行程序，同时该类中也包含了用poi读取Excel(2003版)
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import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;


/**
*
* @author Hongten</br>
*
*                 参考地址：http://hao0610.iteye.com/blog/1160678
*
*/
public class XlsMain {

         public static void main(String[] args) throws IOException {
                XlsMain xlsMain = new XlsMain();
                XlsDto xls = null;
                List<XlsDto> list = xlsMain.readXls();
                
                 try {
                        XlsDto2Excel.xlsDto2Excel(list);
                } catch (Exception e) {
                        e.printStackTrace();
                }
                 for ( int i = 0; i < list.size(); i++) {
                        xls = (XlsDto) list.get(i);
                        System.out.println(xls.getXh() + "        " + xls.getXm() + "        "
                                        + xls.getYxsmc() + "        " + xls.getKcm() + "        "
                                        + xls.getCj());
                }

        }

         /**
         * 读取xls文件内容
         *
         * @return List<XlsDto>对象
         * @throws IOException
         *                         输入/输出(i/o)异常
         */
         private List<XlsDto> readXls() throws IOException {
                InputStream is = new FileInputStream( "pldrxkxxmb.xls");
                HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
                XlsDto xlsDto = null;
                List<XlsDto> list = new ArrayList<XlsDto>();
                 // 循环工作表Sheet
                 for ( int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
                        HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
                         if (hssfSheet == null) {
                                 continue;
                        }
                         // 循环行Row
                         for ( int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
                                HSSFRow hssfRow = hssfSheet.getRow(rowNum);
                                 if (hssfRow == null) {
                                         continue;
                                }
                                xlsDto = new XlsDto();
                                 // 循环列Cell
                                 // 0学号 1姓名 2学院 3课程名 4 成绩
                                 // for (int cellNum = 0; cellNum <=4; cellNum++) {
                                HSSFCell xh = hssfRow.getCell(0);
                                 if (xh == null) {
                                         continue;
                                }
                                xlsDto.setXh(getValue(xh));
                                HSSFCell xm = hssfRow.getCell(1);
                                 if (xm == null) {
                                         continue;
                                }
                                xlsDto.setXm(getValue(xm));
                                HSSFCell yxsmc = hssfRow.getCell(2);
                                 if (yxsmc == null) {
                                         continue;
                                }
                                xlsDto.setYxsmc(getValue(yxsmc));
                                HSSFCell kcm = hssfRow.getCell(3);
                                 if (kcm == null) {
                                         continue;
                                }
                                xlsDto.setKcm(getValue(kcm));
                                HSSFCell cj = hssfRow.getCell(4);
                                 if (cj == null) {
                                         continue;
                                }
                                xlsDto.setCj(Float.parseFloat(getValue(cj)));
                                list.add(xlsDto);
                        }
                }
                 return list;
        }

         /**
         * 得到Excel表中的值
         *
         * @param hssfCell
         *                        Excel中的每一个格子
         * @return Excel中每一个格子中的值
         */
        @SuppressWarnings( "static-access")
         private String getValue(HSSFCell hssfCell) {
                 if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
                         // 返回布尔类型的值
                         return String.valueOf(hssfCell.getBooleanCellValue());
                } else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
                         // 返回数值类型的值
                         return String.valueOf(hssfCell.getNumericCellValue());
                } else {
                         // 返回字符串类型的值
                         return String.valueOf(hssfCell.getStringCellValue());
                }
        }

}






XlsDto2Excel.java类

//该类主要负责向Excel(2003版)中插入数据

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import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;


public class XlsDto2Excel {

         /**
         *
         * @param xls
         *                        XlsDto实体类的一个对象
         * @throws Exception
         *                         在导入Excel的过程中抛出异常
         */
         public static void xlsDto2Excel(List<XlsDto> xls) throws Exception {
                 // 获取总列数
                 int CountColumnNum = xls.size();
                 // 创建Excel文档
                HSSFWorkbook hwb = new HSSFWorkbook();
                XlsDto xlsDto = null;
                 // sheet 对应一个工作页
                HSSFSheet sheet = hwb.createSheet( "pldrxkxxmb");
                HSSFRow firstrow = sheet.createRow(0); // 下标为0的行开始
                HSSFCell[] firstcell = new HSSFCell[CountColumnNum];
                String[] names = new String[CountColumnNum];
                names[0] = "学号";
                names[1] = "姓名";
                names[2] = "学院";
                names[3] = "课程名";
                names[4] = "成绩";
                 for ( int j = 0; j < CountColumnNum; j++) {
                        firstcell[j] = firstrow.createCell(j);
                        firstcell[j].setCellValue( new HSSFRichTextString(names[j]));
                }
                 for ( int i = 0; i < xls.size(); i++) {
                         // 创建一行
                        HSSFRow row = sheet.createRow(i + 1);
                         // 得到要插入的每一条记录
                        xlsDto = xls.get(i);
                         for ( int colu = 0; colu <= 4; colu++) {
                                 // 在一行内循环
                                HSSFCell xh = row.createCell(0);
                                xh.setCellValue(xlsDto.getXh());
                                HSSFCell xm = row.createCell(1);
                                xm.setCellValue(xlsDto.getXm());
                                HSSFCell yxsmc = row.createCell(2);
                                yxsmc.setCellValue(xlsDto.getYxsmc());
                                HSSFCell kcm = row.createCell(3);
                                kcm.setCellValue(xlsDto.getKcm());
                                HSSFCell cj = row.createCell(4);
                                cj.setCellValue(xlsDto.getCj());
(xlsDto.getMessage());
                        }
                }
                 // 创建文件输出流，准备输出电子表格
                OutputStream out = new FileOutputStream( "POI2Excel/pldrxkxxmb.xls");
                hwb.write(out);
                out.close();
                System.out.println( "数据库导出成功");
        }

}


XlsDto .java类

//该类是一个实体类

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public class XlsDto {
         /**
         * 选课号
         */
         private Integer xkh;
         /**
         * 学号
         */
         private String xh;
         /**
         * 姓名
         */
         private String xm;
         /**
         * 学院
         */
         private String yxsmc;
         /**
         * 课程号
         */
         private Integer kch;
         /**
         * 课程名
         */
         private String kcm;
         /**
         * 成绩
         */
         private float cj;
         public Integer getXkh() {
                 return xkh;
        }
         public void setXkh(Integer xkh) {
                 this.xkh = xkh;
        }
         public String getXh() {
                 return xh;
        }
         public void setXh(String xh) {
                 this.xh = xh;
        }
         public String getXm() {
                 return xm;
        }
         public void setXm(String xm) {
                 this.xm = xm;
        }
         public String getYxsmc() {
                 return yxsmc;
        }
         public void setYxsmc(String yxsmc) {
                 this.yxsmc = yxsmc;
        }
         public Integer getKch() {
                 return kch;
        }
         public void setKch(Integer kch) {
                 this.kch = kch;
        }
         public String getKcm() {
                 return kcm;
        }
         public void setKcm(String kcm) {
                 this.kcm = kcm;
        }
         public float getCj() {
                 return cj;
        }
         public void setCj( float cj) {
                 this.cj = cj;
        }
        
}


后台输出：

数据库导出成功
1.0        hongten        信息技术学院        计算机网络应用基础        80.0
2.0        王五        信息技术学院        计算机网络应用基础        81.0
3.0        李胜基        信息技术学院        计算机网络应用基础        82.0
4.0        五班古        信息技术学院        计算机网络应用基础        83.0
5.0        蔡诗芸        信息技术学院        计算机网络应用基础        84.0

struts1.2中的上传运用：

package action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;

import form.UploadForm;

public class UploadAction extends Action
{
   public ActionForward execute(ActionMapping mapping, ActionForm form,
      HttpServletRequest request, HttpServletResponse response)
       throws Exception
  {
    UploadForm uploadForm = (UploadForm)form;
    FormFile formFile = uploadForm.getFile();

    String path = request.getRealPath( "/files")+"\\" + formFile.getFileName();
    FileOutputStream fos = new FileOutputStream(path);
    InputStream fis = formFile.getInputStream();

     int i = -1;
     byte[] b = new byte[100];
     while((i = fis.read(b, 0, 100)) != -1)
    {
      fos.write(b, 0, i);
    }
    fos.close();
    fis.close();
    
    System.out.println(uploadForm.getName());
    System.out.println(path);
    
     return mapping.findForward( "success");
  }

}



package form;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

public class UploadForm extends ActionForm
{
  FormFile file;
  String name;
   public String getName() {
     return name;
  }
   public FormFile getFile() {
     return file;
  }
   public void setFile(FormFile file) {
     this.file = file;
  }
   public void setName(String name) {
     this.name = name;
  }
}

<%@ page language= "java" pageEncoding= "utf-8"%>
<html>
  <body>
    <form action= "uploadFile.do" method= "post" enctype= "multipart/form-data">
      <input type= "text" name= "name" value= "大大大"/>
      <br/>
      <input type= "file" name= "file"/>
      <br/>
      <input type= "submit" value= "submit"/>
      <br/>
      <a href= "upload.jsp">upload.jsp</a>
      <br/>
    </form>
  </body>
</html>

<form-beans>
      <form-bean name= "uploadForm" type= "form.UploadForm"/>
    </form-beans>
<action path= "/uploadFile" name= "uploadForm" type= "action.UploadAction">
        <forward name= "success" path= "/upload.jsp"/>
      </action>

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