ResponseUtil

 package util;

 import java.io.OutputStream;
 import java.io.PrintWriter;

 import javax.servlet.http.HttpServletResponse;

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

 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.println(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();
     }
 }