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Javaweb中简单的文件下载

2016-05-08 21:32 417 查看

1、前台页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h4> 动态文件下载</h4>
<a href="downloadServlet">download文件下载</a>
</body>
</html>

2、后台设计

servlet部分的代码：

package com.xiaojie.download;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class DownloadServlet
*/
@WebServlet("/downloadServlet")
public class DownloadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("application/x-msdownload");

String fileName = "文件下载.docx";
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));

OutputStream out = response.getOutputStream();
String pptFileName = "F:\\自学材料\\sessioni笔记.docx";

InputStream in = new FileInputStream(pptFileName);

byte [] buffer = new byte[1024];
int len = 0;

while((len = in.read(buffer)) != -1){
out.write(buffer, 0, len);
}

in.close();
}

}

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