spring单文件上传demo和下载代码

最新推荐文章于 2024-10-04 21:57:43 发布

原创最新推荐文章于 2024-10-04 21:57:43 发布 · 251 阅读

0 ·

CC 4.0 BY-SA版权

本文介绍了一个简单的文件上传和下载功能实现方法。通过JSP页面进行文件的选择与上传，并使用Spring MVC框架下的控制器来处理文件上传请求及后续的文件保存操作。此外，还实现了文件的下载功能，包括设置下载文件名及响应头。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

UploadFiled.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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>文件上传</title>
</head>
<body>
    <h2>文件上传</h2>
    <form action="upload.do" enctype="multipart/form-data" method="post">
        <table>
            <tr>
                <td>文件描述:</td>
                <td><input type="text" name="description"></td>
            </tr>
            <tr>
                <td>请选择文件:</td>
                <td><input type="file" name="file"></td>
            </tr>
            <tr>
                <td><input type="submit" value="上传"></td>
            </tr>
        </table>
    </form>
</body>
</html>

控制器FileUploadController.class

package cn.upload.controller;

import java.io.File;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import cn.upload.domain.User;

@Controller

public class FileUploadController {

	@RequestMapping("/UploadFiled")
	public String s(){
		System.out.println("==");
		return "/UploadFiled";
		
	}
	
//	@ResponseBody @RequestParam("description") String description,
	@RequestMapping(value="/upload",method=RequestMethod.POST)
	public String  upload(HttpServletRequest request,
						 @RequestParam("description")String description,
						 @RequestParam("file") MultipartFile file)throws Exception{
		System.out.println("sddddd");
		System.out.println(description);
		//如果文件不为空，写入上传路径
		if(!file.isEmpty()){
			//上传文件路径
			String path=request.getServletContext().getRealPath("/imag");
			System.out.println(path);
			String filename=file.getOriginalFilename();
			
			File filepath=new File(path,filename);
			//判断路径是否存在，如果不存在就创建一个
			if(!filepath.getParentFile().exists()){
				filepath.getParentFile().mkdirs();
				
			}
			//将上传的文件保存到目标文件中
			file.transferTo(new File(path+File.separator+filename));
			return "success";
		}else{
			return "error";
		}
		
	}

文件下载

@RequestMapping(value="/download")
	public ResponseEntity<byte[]> down(HttpServletRequest request,
			@RequestParam("filename") String filename,
			Model model)throws Exception{
		
		//下载路径
		String path=request.getServletContext().getRealPath("/imag/");
		
		File file=new File(path+File.separator+filename);
		HttpHeaders headers=new HttpHeaders();
		
		//下载显示的文件名，解决中文名称乱码问题
		String downloadfilename=new String(filename.getBytes("UTF-8"),"iso-8859-1");
		
		//通知浏览器以attachment (下载方式)打开图片
		headers.setContentDispositionFormData("attachment", downloadfilename);
		
		
		
		return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers,HttpStatus.CREATED);
	}