SpringMCV 的上传和下载

原创已于 2022-03-01 23:48:05 修改 · 215 阅读

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#java #spring #mvc

于 2022-03-01 23:47:38 首次发布

本文介绍了如何在SpringMVC中配置文件上传功能，包括使用CommonsMultipartResolver进行配置，以及处理文件上传和下载的Controller实现。同时，展示了如何处理多文件上传和提供文件下载链接。

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首先需要导入对应的jar包

    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>

    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>

然后去springmvc.xml里编写相关的配置

<!--    给上传做配置（解析器） -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!--编码格式-->
        <property name="defaultEncoding" value="utf-8"></property>
        <!--上传的最大限制（字节k） -->
        <property name="maxUploadSize" value="102400000"></property>
    </bean>

案例：

<form action="controller/upload" method="post" enctype="multipart/form-data">
    上传1 ：<input type="file" value="file"><br>
    上传2 ：<input type="file" value="file"><br>
    上传3 ：<input type="file" value="file"><br>
    <input type="submit" value="确定">

    <a href="download/xxx.zip">下载1</a>
    <a href="download/ci.png">下载2</a>
    <a href="controller/download?fileName=ci.png">下载3</a>
</form>

接下来要在webapp文件夹下新建上传的文件夹upload和下载的文件夹download

package org.zhx.controller;


import org.apache.commons.io.FileUtils;
import org.aspectj.util.FileUtil;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.Random;

@Controller
@RequestMapping("/controller")
public class UploadController {
    @RequestMapping("/upload")
    public String upLoad(MultipartFile[] file,HttpServletRequest request) {
        for (int i = 0; i < file.length; i++) {
            //获得上传的路径    路径要与你自己所建的文件夹的名字保持一致
            String path = request.getServletContext().getRealPath("/upload/");
            //拿到从页面上传过来的文件
            String name = file[i].getOriginalFilename();
            //将拿到的文件重命名
            String newName = new Date().getTime()+new Random(100000).nextInt()+name;
            //上传的路径
            File f = new File(path+newName);
            //上传
            try {
                file[i].transferTo(f);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return "success";
    }
    @RequestMapping("/download")
    public ResponseEntity<byte[]> download(@RequestParam("fileName")String fileName, HttpServletRequest request) throws IOException {
        //1.获得下载的路径
        String path=request.getServletContext().getRealPath("/download/");
        System.out.println(path);
        //下载的完整路径
        File f = new File(path+fileName);
        System.out.println("path+fileName:"+path+fileName);
        //转换格式
        String name = new String(fileName.getBytes("utf-8"),"iso8859-1");
        //头部信息对象，转流
        HttpHeaders hh = new HttpHeaders();
        hh.setContentDispositionFormData("attachment",name);
        hh.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(f),hh,HttpStatus.CREATED);
    }
}