jsp生成excel

 

//首先要引入3个包：
//poi-2.5.1-final-20040804.jar
//poi-contrib-2.5.1-final-20040804.jar
//poi-scratchpad-2.5.1-final-20040804.jar 
 
//代码：
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import org.apache.poi.hssf.usermodel.*;
import javax.servlet.ServletOutputStream;
import java.util.List;


import java.io.*;
import java.util.Iterator;
public class QuestionnaireToExcelAction extends Action ...{
 //指定生成文件的类型
  private   static   final   String   CONTENT_TYPE   =   "application/vnd.ms-excel"; 

  public ActionForward execute(ActionMapping mapping, ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response) ...{
      //获得记录
      List list = QuestionnaireProxy.getall();
          Iterator it = list.iterator();
          Questionnaire que = null;
          //设定类型
          response.setContentType(CONTENT_TYPE);
          HSSFWorkbook wb = new HSSFWorkbook();
          HSSFSheet s = wb.createSheet();
          //设定文件名字
          wb.setSheetName(0, "qustionnaire");
          HSSFCell cell = null; 

          for (short i = 0; i < (list.size()+1); i++) ...{
              HSSFRow row = s.createRow(i);
              //第一行
               if(i==0)
               ...{
                  cell = row.createCell(Short.parseShort("0"));
                  cell.setEncoding(HSSFCell.ENCODING_UTF_16);
                  cell.setCellValue("字段1");
                  cell = row.createCell(Short.parseShort("1"));
                  cell.setEncoding(HSSFCell.ENCODING_UTF_16);//设置字体
                  cell.setCellValue("字段2");
               }else
               ...{
                   //以下几行
                   que = (Questionnaire) it.next();
                   cell = row.createCell(Short.parseShort("0"));
                   cell.setEncoding(HSSFCell.ENCODING_UTF_16);
                   cell.setCellValue("" + que.get字段1);
                   cell = row.createCell(Short.parseShort("1"));
                   cell.setEncoding(HSSFCell.ENCODING_UTF_16);
                   cell.setCellValue("" + que.get字段2);
               }
          } 

          ServletOutputStream stream = null;
          try ...{
              stream = response.getOutputStream();
          } catch (IOException ex1) ...{
          }
          try ...{
              wb.write(stream);
          } catch (IOException ex2) ...{
          }
          try ...{
              stream.flush();
              stream.close();
          } catch (IOException ex) ...{
          }
   return mapping.findForward("");
  }
}