使用poi导出execl

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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);
}