一、创建下载页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@page import="java.net.URLEncoder"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件下载</title>
</head>
<body>
<!-- <a href="/chapter12/DownloadServlet?filename=1.jpg">文件下载 </a> -->
<a href="/chapter12/DownloadServlet?filename=<%=URLEncoder.encode("风景.jpg", "utf-8")%>">文件下载 </a>
</body>
</html>二、创建Servlet
public class DownloadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
//设置ContentType字段值
response.setContentType("text/html;charset=utf-8");
//设置响应消息编码
response.setCharacterEncoding("utf-8");
//设置请求消息编码
request.setCharacterEncoding("utf-8");
//获取所要下载的文件名称
String filename = request.getParameter("filename");
filename = filename.trim();
//下载文件所在目录
String folder = "/download/";
// 通知浏览器以下载的方式打开
response.addHeader("Content-Type", "application/octet-stream");
response.addHeader("Content-Disposition",
"attachment;filename="+URLEncoder.encode(filename,"utf-8"));
// 通过文件流读取文件
InputStream in = getServletContext().getResourceAsStream(
folder+filename);
// 获取response对象的输出流
OutputStream out = response.getOutputStream();
byte[] buffer = new byte[1024];
int len;
//循环取出流中的数据
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
doGet(request, response);
}
}三、创建下载目录及文件
