java代码实现导出excel

<%@ page language="java" contentType="application/vnd.ms-excel; charset=utf-8" pageEncoding="UTF-8"%>
<%
response.setHeader("Content-disposition","inline;filename=Billing.xls");
%>

<input class="input1"  value="导出Excel文件" style="margin:12px;" type="button" id="excel">