vue+Springboot下载文件

前端代码

1	`<el-button type="primary"` `@click="dowload2('1662023440868上传测试.jpg')">下载</el-button>`

　　js代码

dowload2(msg){
         let href = "http://localhost:9090/myFiles/downloadFile?flag="+msg;
         let downloadElement = document.createElement('a')
         downloadElement.style.display = 'none'
         downloadElement.href = href
         document.body.appendChild(downloadElement)
         // 点击下载
         downloadElement.click()
     },

　后端代码方法1

@RequestMapping("/downloadFile")
   public void downloadFiles(@RequestParam("flag") String downUrl, HttpServletRequest request, HttpServletResponse response) {
       downUrl = "D:/FileUpload/"+downUrl;
       System.out.println("downUrl========"+downUrl);
       OutputStream outputStream = null;
       InputStream inputStream = null;
       BufferedInputStream bufferedInputStream = null;
       byte[] bytes = new byte[1024];
       File file = new File(downUrl);
       String fileName = file.getName();
       System.out.println("本次下载的文件为" + downUrl);
       // 获取输出流
       try {
           // StandardCharsets.ISO_8859_1 *=UTF-8'
           // response.setHeader("Content-Disposition", "attachment;filename=" +  new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1));
           response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
           // 以流的形式返回文件
           response.setContentType("application/octet-stream;charset=utf-8");
           inputStream = new FileInputStream(file);
           bufferedInputStream = new BufferedInputStream(inputStream);
           outputStream = response.getOutputStream();
           int i = bufferedInputStream.read(bytes);
           while (i != -1) {
               outputStream.write(bytes, 0, i);
               i = bufferedInputStream.read(bytes);
           }
       } catch (IOException e) {
           e.printStackTrace();
       } finally {
           try {
               if (inputStream != null) {
                   inputStream.close();
               }
               if (outputStream != null) {
                   outputStream.close();
               }
               if (bufferedInputStream != null) {
                   bufferedInputStream.close();
               }
           } catch (IOException e) {
               e.printStackTrace();
           }
 
       }
     }
   

　　方法2

@RequestMapping("/getFile")
    public void getFile(@RequestParam("flag") String flag, HttpServletResponse response) throws UnsupportedEncodingException {
        System.out.println("getFile下载参数flag======"+flag);
        Result res = new Result();
        String path = "";
        //response.setHeader("Content-Disposition", "attachment;filename=" +  URLEncoder.encode(flag, "UTF-8"));
        // 以流的形式返回文件
        response.setContentType("application/octet-stream;charset=utf-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(flag, "UTF-8"));
        try{
            System.out.println("下载文件flag====="+flag);
            OutputStream os;
            path = "D:/FileUpload/"+flag;
            byte[] bytes =  FileUtil.readBytes(new File(path));
            os = response.getOutputStream();
            os.write(bytes);
            os.flush();
            os.close();
            System.out.println("path====="+path);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

　　pom.xml文件

<dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>
 
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.5</version>
        </dependency>