使用poi导出execl

使用poi需要用到的jar包

 

本文的导出基于execl的模板导出，在大部分表头固定而格式花样比较复杂的建议使用本文介绍的方法（表头固定，只需要填充值）

 

1、在webroot目录下新建report文件夹来存放模板execl文件

2、jsp前台请求对应的action代码

 

String path = request.getSession().getServletContext().getRealPath("/")+"report/goodslaunch.xls";

String id = request.getParameter("id");//需要导出的数据的某Id

String name = this.xxService.loadNameById(id);//查询出id对应的真实名称



ByteArrayOutputStream os = (ByteArrayOutputStream)this.xxxService.expExecl(id, path);

if(null!=os && os.size()>0){

    byte[] buffer = os.toByteArray();

    

    String fileName = "[" + name + "]XX模块." + path.substring(path.lastIndexOf(".")+1, path.length());

    // 设置response的Header

    response.setContentType("application/x-msdownload; charset=UTF-8");  

    response.addHeader("content-type", "application/x-msexcel");  

    response.addHeader("content-disposition", "attachment; filename="+ new String(fileName.getBytes("gb2312"), "iso8859-1"));  //这里必须转码，或者会有问题

    response.setContentLength(buffer.length);  

    

    OutputStream out = response.getOutputStream();

    out.write(buffer);

    out.flush();

    os.close();

}

 

3、service代码

import org.apache.poi.ss.usermodel.CellStyle;

import org.apache.poi.ss.usermodel.Font;

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.ss.usermodel.WorkbookFactory;



/**

 * 导出生成execl

 * @throws Exception 

 */

public OutputStream expExecl(String id,String execlPath) throws Exception{

    List<XxDto> data = this.getSearchResult(id);

    

    Workbook wb = WorkbookFactory.create(new File(execlPath));

    

    Font font = wb.createFont();

    font.setFontName("微软雅黑");

    font.setFontHeightInPoints((short) 10);

    

    CellStyle style = wb.createCellStyle();

    style.setBorderBottom((short)1);

    style.setBorderLeft((short)1);

    style.setBorderRight((short)1);

    style.setBorderTop((short)1);

    style.setFont(font);

    

    if(data.size()>0){

        Sheet sheet = wb.getSheetAt(0);

        int rownum = 1;

        for(XxDto item : data){

            Row row = sheet.createRow(rownum++);

            int cellnum = 0;

            row.createCell(cellnum++).setCellValue(item.getXxx());

            row.createCell(cellnum++).setCellValue(item.getXxx());

            row.createCell(cellnum++).setCellValue(item.getXxx());

            row.createCell(cellnum++).setCellValue(item.getXxx());

            row.createCell(cellnum++).setCellValue(item.getXxx());

            row.createCell(cellnum++).setCellValue(item.getXxx());

            row.createCell(cellnum++).setCellValue(item.getXxx());

            

            //设置样式

            for(int i=0; i<cellnum; i++){

                row.getCell(i).setCellStyle(style);

            }

        }

    }

    OutputStream os = new ByteArrayOutputStream();

    wb.write(os);

    return os;

}

 

当没有模板时需要创建文件（2007和2007以前的execl的写法是不同的）

  Workbook wb;
  Sheet sheet;

File file = new File(fileName);

//文件不存在

if(!file.exists()){

    addFlag = false;

}

if(!addFlag){

    if("xls".equals(fileSuffix)){

                //老execl

        wb = new HSSFWorkbook();

    }else{

                //新execl

        wb = new XSSFWorkbook();

    }

    sheet = wb.createSheet("data");

    createExeclHead(sheet);

}else{

        //利用工厂读取execl可以不需要关心execl的版本问题

    wb = WorkbookFactory.create(file);

    sheet = wb.getSheetAt(0);

}

 

更详细的用法可以去官网看文档:http://poi.apache.org/