java操作Excel之POI（4）利用POI实现数据的批量导出

1 /**
2 *    后台导出方法
3 *    利用POI实现数据的批量导出
4 */
5 public String export() throws Exception{
6     Connection con = null;
7     try{
8         con = dbUtil.getCon();
9         Workbook wb = new HSSFWorkbook();
10         String headers[] = {"编号", "姓名", "电话", "Email", "QQ"};
11         ResultSet rs = userDao.userList(con, null);
12         ExcelUtil.fillExcelData(rs, wb, headers);
13
14         //把wb以流的形式输出
15         ResponseUtil.export(ServletActionContext.getResponse(), wb, "导出Excel.xls");
16     }catch(Exception e){
17         e.printStackTrace();
18     }finally{
19         try{
20             dbUtil.closeCon(con);
21             dbUtil.closeRs(rs);
22         }catch(Exception e){
23             e.printStackTrace();
24         }
25     }
26
27     return null;
28 }

1 /**
2 *    处理Excel的util
3 */
4 public class ExcelUtil{
5
6     public static void fillExcelData(ResultSet rs, Workbook wb, String[] headers) throws Exception{
7         int rowIndex = 0;
8         Sheet sheet = wb.createSheet();
9         Row row = sheet.createRow(rowIndex++);
10         for(int i=0; i<headers.length; i++){
11             row.createCell(i).setCellValue(headers[i]);
12         }
13
14         //这里假设的是头的列数和数据的列数是一样的
15         while(rs.next()){
16             row = sheet.createRow(rowIndex++);
17             for(int i=0; i<headers.length; i++){
18                 row.createCell(i).setCellValue(rs.getObject(i+1).toString());
19             }
20         }
21     }
22 }

1 /**
2 *    ResponseUtil相应util
3 */
4 public class ResponseUtil{
5     public static void write(HttpServletResponse response, Object o) throws Exception{
6         response.setContentType("text/html;charset=utf-8");
7         PrintWriter pw = response.getWriter();
8         pw.print(o.toString());
9         pw.flush();
10         pw.close();
11     }
12
13     /**
14     *导出Excel
15     * fileName: 导出的文件名
16     */
17     public static void export(HttpServletResponse response, Workbook wb, String fileName) throws Exception{
18         response.setHeader("Content-Disposition", "attachment;filename="
19             +new String(fileName.getBytes("utf-8"), "iso8859-1"));
20         response.setContentType("application/ynd.ms-excel;charset=UTF-8");
21         OutputStream out = response.getOutputStream();
22         wb.write(out);
23         out.flush();
24         out.close();
25     }
26 }