JSP文件下载实现-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_36721251/article/details/69788961

简单讲下jsp文件下载:

download.jsp

<%@ 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>download</title>
</head>
<body>
	<a href="download.do?filename=图片名">下载</a>
</body>
</html>

downloadServlet.java

package servlet;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.FileUtils;

public class downloadServlet extends HttpServlet{
	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//获取下载的文件名
		String filename=request.getParameter("filename");
		//设置为下载类型   application/x-msdownload
		response.setContentType("application/x-msdownload");
		//设置下载路径选择
		response.addHeader("Content-Disposition", "attachment;filename="+filename);
		//获取文件路径
		String webpath=request.getServletContext().getRealPath("/");
		File f=new File(webpath+"files/"+filename);
		ServletOutputStream sos=response.getOutputStream();
		FileUtils.copyFile(f,sos);
		sos.close();
	}
}