【学习笔记】SpringMVC实现文件下载_com.hbxy.ssm.springmvc.controller.filedownloadcont-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_44940503/article/details/114264545

本文介绍了如何使用SpringMVC在控制器中编写代码来实现文件下载功能，并详细讲解了在JSP页面中如何配合控制器完成下载操作。

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controller代码

package com.mvc.controller;

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

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class FileDownloadController {
	@GetMapping("fileDownload.do")
	public void uploadFile(HttpServletRequest request,HttpServletResponse response,String fileName) throws IOException {
		//得到文件的实际路径
		String realpath = request.getServletContext().getRealPath("/");
		File file = new File(realpath,fileName);
		
		//设置响应头，支持文件的下载
		response.addHeader("Content-Disposition", "attachment;fileName="+fileName);
		
		//先从服务器上读取文件
		FileInputStream fis = new FileInputStream(file);
		
		//然后将这个文件写入目标位置
		OutputStream fos = response.getOutputStream();
		
		//小文件读取和写入
		byte[] b = new byte[fis.available()];
		
		fis.read(b);
		
		fos.write(b);
		
		fos.close();
		fis.close();
		
	}
}

jsp页面实现下载

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	file download
	<input type="text" id="fileName">
	<a id="download">图片下载</a>
	<script src="js/jquery.min.js"></script>
	<script >
		$(function(){
			$("#download").click(function(){
				location.href="fileDownload.do?fileName="+$("#fileName").val();
			})
		})
	</script>
</body>
</html>