2021-02-26

SpringBoot 文件或图片上传与下载

  • 导入依赖(pom.

     <!-- 上传下载需要设计到的jar包 -->  <dependency>   <groupId>commons-io</groupId>   <artifactId>commons-io</artifactId>   <version>2.6</version>  </dependency>  <dependency>   <groupId>commons-fileupload</groupId>   <artifactId>commons-fileupload</artifactId>   <version>1.3.3</version>  </dependency>  <!--servlet-api导入高版本的-->  <dependency>   <groupId>javax.servlet</groupId>   <artifactId>javax.servlet-api</artifactId>   <version>4.0.1</version>  </dependency>  <!-- 图片处理类 -->  <dependency>   <groupId>net.coobird</groupId>   <artifactId>thumbnailator</artifactId>   <version>0.4.8</version>  </dependency>

  • 全局配置 application.properties

# 上传文件大小spring.servlet.multipart.max-file-size=5MBspring.servlet.multipart.max-request-size=5MB

  • 创建 WebMvcConfig 配置类  静态资源映射

@Configurationpublic class WebMvcConfig implements WebMvcConfigurer { @Override public void addResourceHandlers(ResourceHandlerRegistry registry) {  ApplicationHome h = new ApplicationHome(getClass());  File jarF = h.getSource();  String dirPath = jarF.getParentFile().toString()+"/upload/";  String os = System.getProperty("os.name");  if (os.toLowerCase().startsWith("win")) { //如果是Windows系统   registry.addResourceHandler("/upload/**").addResourceLocations("file:"+dirPath);  } else {   registry.addResourceHandler("/upload/**").addResourceLocations("file:"+dirPath);  } }}

  • 文件或图片上传

  • 控制层
// 上传文件 @ResponseBody @RequestMapping("/upload") public String fileUpload(@RequestParam("files") MultipartFile files) throws IOException {//  // win系统 上传路径保存设置//  // 获取项目路径//  File projectPath = new File(ResourceUtils.getURL("classpath:").getPath());//  // 绝对路径=项目路径+自定义路径//  File pathFile = new File(projectPath.getAbsolutePath(), "static/upload/");//  if (!pathFile.exists()) {//   pathFile.mkdirs();//  }//  //上传文件地址//  UUID uuid = UUID.randomUUID();//  File serverFile = new File(pathFile, uuid + "_" + files.getOriginalFilename());//  files.transferTo(serverFile);////  String imgPath = ("/upload/" + uuid + "_" + files.getOriginalFilename()).replace("\\", "/");////  return imgPath;  // Linux服务器 上传路径保存设置  // 项目路径 /home/www/  File pathFile = new File("/home/www/upload/");  if (!pathFile.exists()) {   pathFile.mkdirs();  }  //上传文件地址  UUID uuid = UUID.randomUUID();  File serverFile = new File(pathFile, uuid + "_" + files.getOriginalFilename());  files.transferTo(serverFile);  String imgPath = ("/upload/" + uuid + "_" + files.getOriginalFilename()).replace("\\", "/");  return imgPath; }

  • HTML页面    Ajax 无刷新上传 

<form action="" class="layui-form" enctype="multipart/form-data" method="post">  <input type="hidden" name="blogImg" id="imgPath" value="">  <div class="form-group">    <label>图片上传</label>    <input type='file' style='margin: 5px;' name='files' required><br>    <button type="button" class="layui-btn" id="img_upload">上传图片</button>  </div>  <input type="submit"></form>

  • JS

//普通图片上传  $('#img_upload').click(function () {   var formData = new FormData();   //获取选择的文件   $.each($('input[name="files"]'),function (index,item) {    formData.append("files",item.files[0])   });   //发送异步请求   $.ajax({    method:'post',    url: '[[@{/user/upload}]]', // 文件上传接口    data:formData,    processData: false,    contentType:false,    success:function (data) {     //成功返回触发的方法     $('#imgPath').val(data);     alert("上传成功");    },    //请求失败触发的方法    error:function () {     alert("上传失败");    }   });  });

  • 文件或图片下载

  • 控制层
@RequestMapping(value="/download")public String downloads(HttpServletResponse response ,HttpServletRequest request) throws Exception{ //要下载的图片地址 String path = request.getServletContext().getRealPath("/upload"); String fileName = "基础语法.jpg"; //1、设置response 响应头 response.reset(); //设置页面不缓存,清空buffer response.setCharacterEncoding("UTF-8"); //字符编码 response.setContentType("multipart/form-data"); //二进制传输数据 //设置响应头 response.setHeader("Content-Disposition",   "attachment;fileName="+URLEncoder.encode(fileName, "UTF-8")); File file = new File(path,fileName); //2、 读取文件--输入流 InputStream input=new FileInputStream(file); //3、 写出文件--输出流 OutputStream out = response.getOutputStream(); byte[] buff =new byte[1024]; int index=0; //4、执行 写出操作 while((index= input.read(buff))!= -1){  out.write(buff, 0, index);  out.flush(); } out.close(); input.close(); return null;}

  • HTML页面  

<a href="/download">点击下载</a>

  • SpringBoot 文件或图片上传与下载就可以了 

 

 

参考资料:狂神说SpringMVC:文件上传下载









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导入依赖(pom.    <!--上传下载需要设计到的jar包--><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.6</version></dependency>&
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