利用poi开源控件导出excel文件

利用poi开源控件导出excel文件

1在apache http://poi.apache.org/download.html上下载poi开源控件包。目前最稳定的版本： The latest stable release is Apache POI 3.7
2将poi.jar引入项目
3更改业务逻辑，将业务逻辑返回的查询到的对象集合存入session
request.getSession().setAttribute("pclist", list);
4建立ToExcelAction

package com.vle.oa.action;

import java.util.List;

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

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.CellRangeAddress;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;

import com.vle.oa.domain.Pc;

public class ToExcelAction extends DispatchAction {
    
    @Override
    protected ActionForward unspecified(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        Workbook wb = new HSSFWorkbook();
         
        //Workbook wb = new XSSFWorkbook();
        CreationHelper createHelper = wb.getCreationHelper();
        
        //设置样式
        HSSFCellStyle titleSytle=(HSSFCellStyle) wb.createCellStyle();
        titleSytle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);
        titleSytle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        
        Sheet sheet = wb.createSheet("电脑明细表");

        // Create a row and put some cells in it. Rows are 0 based.
        
        sheet.addMergedRegion(new CellRangeAddress(0,1,0,4));
        HSSFRow rt=null;
        HSSFCell ct=null;
        rt=(HSSFRow) sheet.createRow(0);
        ct=rt.createCell(0);
        ct.setCellStyle(titleSytle);
        ct.setCellValue(new HSSFRichTextString("电脑信息表"));
        
        HSSFCellStyle tableSytle=(HSSFCellStyle) wb.createCellStyle();
        tableSytle.setBorderBottom((short)1);
        tableSytle.setBorderLeft((short)1);
        tableSytle.setBorderRight((short)1);
        tableSytle.setBorderTop((short)1);
        tableSytle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        
        Row row0 = sheet.createRow((short)1);
      
        String[] title=new String[]{"id","电脑编码","电脑类别","使用店铺","责任人"};
        List list=(List) request.getSession().getAttribute("pclist");
        for(int i=0;i<title.length;i++){
            Cell cell = row0.createCell(i);
            
            cell.setCellValue(title[i]);
            
        }
        for(int i=0;i<list.size();i++){
            Pc pc=new Pc();
            pc=(Pc) list.get(i);
            Row r = sheet.createRow((short)i+2);
            
            String[] pcInfo=new String[]{String.valueOf(pc.getId()),pc.getPcId()
                    ,pc.getPcType(),pc.getShopName(),pc.getUserName()};
            for(int j=0;j<pcInfo.length;j++){
                Cell c=r.createCell(j);
                c.setCellStyle(tableSytle);
                c.setCellValue(pcInfo[j]);
                
            }

        }
        request.setAttribute("wb", wb);

        
        return mapping.findForward("excel");
    }

}

action返回了一个excel报表对象后跳转到struts中配置的页面

     < action  path ="/toExcel"
                type ="com.vle.oa.action.ToExcelAction"
                parameter ="command"
                 scope ="request" >
             < forward  name ="excel"  path ="/pc/excel.jsp" />
         </ action >

：
在这里我使用的是struts1，struts2同样原理一样最后编写跳转的jsp

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

    response.reset();
    out.clear();
    out=pageContext.pushBody();

    response.setContentType("application/msexcel");   
     response.setHeader("Content-disposition","inline; filename=myexcel.xls"); //attachment   
        
      HSSFWorkbook wb = (HSSFWorkbook)request.getAttribute("wb");   
     OutputStream os = response.getOutputStream();   
     wb.write(os);   
     os.flush();   
     os.close();   
%>

效果如下
：