有時候我們在做項目時,有些項目需要生成Microsoft Excel文件格式的報告。有時,甚至希望將Excel文件作爲輸入數據。這是我們需要用到Apache POI 。例如,一個公司開發的應用程序將財務部門需要所有輸出生成自己的Excel。
利用 POI 實現數據的批量導出
1.編寫導出工具類
public class ExcelUtil {
public static void fillExcelData(ResultSet rs,Workbook wb,String[] headers)throws Exception{
int rowIndex=0;
Sheet sheet=wb.createSheet();
Row row=sheet.createRow(rowIndex++);
for(int i=0;i<headers.length;i++){
row.createCell(i).setCellValue(headers[i]);
}
while(rs.next()){
row=sheet.createRow(rowIndex++);
for(int i=0;i<headers.length;i++){
row.createCell(i).setCellValue(rs.getObject(i+1).toString());
}
}
}
}
public class ResponseUtil {
public static void write(HttpServletResponse response,Object o)throws Exception{
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
out.print(o.toString());
out.flush();
out.close();
}
public static void export(HttpServletResponse response,Workbook wb,String fileName)throws Exception{
response.setHeader("Content-Disposition", "attachment;filename="+new String(fileName.getBytes("utf-8"),"iso8859-1"));
response.setContentType("application/ynd.ms-excel;charset=UTF-8");
OutputStream out=response.getOutputStream();
wb.write(out);
out.flush();
out.close();
}
}
2.編寫action類導出方法
public String export()throws Exception{
Connection con=null;
try {
con=dbUtil.getCon();
Workbook wb=new HSSFWorkbook();
String headers[]={"編號","姓名","電話","Email","QQ"};
ResultSet rs=userDao.userList(con, null);
ExcelUtil.fillExcelData(rs, wb, headers);
ResponseUtil.export(ServletActionContext.getResponse(), wb, "導出excel.xls");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
dbUtil.closeCon(con);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
3.編寫頁面
function exportUser(){
window.open('user!export') ;
}
5.查看結果
本實例用了easyui 與 struts2 ,無關緊要,簡單的把相關POI代碼粘貼出來,僅供參考。。