SpringMVC如何实现文件上传下载

本篇内容主要讲解"SpringMVC如何实现文件上传下载"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"SpringMVC如何实现文件上传下载"吧!

一、通用配置

pom.xml

                                org.springframework            spring-webmvc            5.3.13                                    ch.qos.logback            logback-classic            1.2.3                                    javax.servlet            javax.servlet-api            4.0.1            provided                                    org.thymeleaf            thymeleaf-spring5            3.0.12.RELEASE                                    commons-fileupload            commons-fileupload            1.3.1                                    org.springframework            spring-context            5.3.11                            junit            junit            4.12            test                                    org.springframework            spring-test            5.3.13                                            mysql            mysql-connector-java            8.0.24                                            com.alibaba            druid            1.2.8                                            org.springframework            spring-context            5.3.11                                    javax.servlet            javax.servlet-api            4.0.1            provided                            javax.servlet.jsp            javax.servlet.jsp-api            2.3.3                                    com.fasterxml.jackson.core            jackson-databind            2.12.1                                            commons-fileupload            commons-fileupload            1.3.1            

上传功能的关键jar

web.xml

                        字符集过滤器        characterEncodingFilter        org.springframework.web.filter.CharacterEncodingFilter                    字符集编码            encoding            UTF-8                            forceEncoding            true                            characterEncodingFilter        /*                HiddenHttpMethodFilter        org.springframework.web.filter.HiddenHttpMethodFilter                HiddenHttpMethodFilter        /*                    DispatcherServlet        org.springframework.web.servlet.DispatcherServlet                    contextConfigLocation            classpath:springMVC.xml                1                DispatcherServlet        /    

springMVC.xml

                                                                                                                                                                                                                                                                                                                                                        text/html                application/json                                                

实现页面跳转,vue文件解析,上传内容解析的关键

file.html内容demo

下载1.jpg
    头像: 
    

二、实现文件下载,上传功能

package com.vector.controller;import org.springframework.beans.factory.annotation.Value;import org.springframework.http.HttpHeaders;import org.springframework.http.HttpStatus;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Controller;import org.springframework.util.MultiValueMap;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.multipart.MultipartFile;import javax.annotation.Resource;import javax.servlet.ServletContext;import javax.servlet.http.HttpSession;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.UUID;@Controllerpublic class FileUpAndDownController {    @RequestMapping("/testDown")    public ResponseEntity testResponseEntity(HttpSession session) throws IOException {        //获取ServletContext对象        ServletContext servletContext = session.getServletContext();        //获取服务器中文件的真实路径        String realPath = servletContext.getRealPath("/static/img/1.jpg");        //创建输入流        InputStream is = new FileInputStream(realPath);        //创建字节数组        byte[] bytes = new byte[is.available()];        //将流读到字节数组中        is.read(bytes);        //创建HttpHeaders对象设置响应头信息        MultiValueMap headers = new HttpHeaders();        //设置要下载方式以及下载文件的名字        //Content-Disposition 固定回复内容格式  attachment以附件形式下载  filename=1.jpg文件名        //可以将filename拼接为动态命名        headers.add("Content-Disposition", "attachment;filename=1.jpg");        //设置响应状态码        HttpStatus statusCode = HttpStatus.OK;        //创建ResponseEntity对象        ResponseEntity responseEntity = new ResponseEntity<>(bytes, headers, statusCode);        //关闭输入流        is.close();        return responseEntity;    }    @RequestMapping("/testUp")    public String testUp(@Value("multipartResolver") MultipartFile photo,HttpSession session) throws IOException {        //获取上传的文件的文件名        String fileName = photo.getOriginalFilename();        //处理文件重名问题        //重名问题是java.io中写入同一文件默认覆盖原文件内容导致图片被覆盖.        //获取文件名后缀        String suffixName = fileName.substring(fileName.lastIndexOf("."));        //将UUID作为文件名  uuid是32位随机数,几乎不可能会重复        fileName = UUID.randomUUID().toString() + suffixName;        //获取服务器中photo目录的路径        ServletContext servletContext = session.getServletContext();        String photoPath = servletContext.getRealPath("photo");        File file = new File(photoPath);        //判断服务器是否存在该路径        if(!file.exists()){            file.mkdir();        }        String finalPath = photoPath + File.separator + fileName;        //实现上传功能        photo.transferTo(new File(finalPath));        return "success";    }}

下载功能测试

上传功能测试

到此，相信大家对"SpringMVC如何实现文件上传下载"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！