前端form表單上傳圖片示例程式碼

<form action="/picture/upload" method="post" enctype="multipart/form-data" name="upload_form">
    <label>選擇圖片檔案</label>
    <input name="imgfile" type="file" accept="image/gif, image/jpeg"/>
    <input name="upload" type="submit" value="上傳" />
</form>
 

後臺需要匯入下面兩個包

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.4</version>
</dependency>
<dependency>
  <groupId>commons-fileupload</groupId>
  <artifactId>commons-fileupload</artifactId
 
>
  <version>1.3.1</version>
</dependency>

後臺controller程式碼

@ResponseBody
@RequestMapping(value = "/picture/upload")
public ResultData pictureUpload(HttpServletRequest request) {
    pictureService.uploadPicture(request);
    return ResultData.success();
}

後臺service程式碼

    private
 
 String address = "D:/image/";

    private static final long MAXSIZE = 1048576;

    private static Set<String> formatSet = Sets.newHashSet();

    static {
        formatSet.add(".jpg");
        formatSet.add(".png");
    }

    private String getFormat(FileItem item) {
        long size = item.getSize();
        //設定上傳的最大值1MB, 1024*1024
        if(size > MAXSIZE) {
            throw new PictureException("圖片過大, 請使用小於1MB的圖片上傳");
        }
        String fileName = item.getName();
        String format =  fileName.substring(fileName.lastIndexOf("."));
        if(!formatSet.contains(format)) {
            throw new PictureException("請使用格式為.jpg或.png的圖片");
        }
        return format;
    }

    private File createFile(String athleteIdCard, String format) {
        //目錄結構 address+省份+運動員id.jpg(圖片名) 例如 D:/image/HUNAN/123.jpg
        String team = "HUNAN";
        String fileName = address + team + "/" + athleteIdCard + format;
        File file = new File(fileName);
        if(!file.getParentFile().exists()) {
            //建立多級目錄
            if(!file.getParentFile().mkdirs()) {
                throw new PictureException("建立檔案失敗");
            }
        }
        if(!file.exists()) {
            try {
                if(file.createNewFile()) {
                    return file;
                }
            } catch (IOException e) {
                e.printStackTrace();
                throw new PictureException("建立檔案失敗");
            }
        }
        return file;
    }

    @Override
    public void uploadPicture(HttpServletRequest request) {
        String number = "123";
        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setHeaderEncoding("UTF-8");
        InputStream inputStream = null;
        FileOutputStream fileOutputStream = null;
        try {
            List<FileItem> list = upload.parseRequest(request);
            for(FileItem item : list) {
                if(!item.isFormField()) {
                    String format = getFormat(item);
                    inputStream = item.getInputStream();
                    byte[] buffer = new byte[1024];
                    File file = createFile(number, format);
                    fileOutputStream = new FileOutputStream(file);
                    int len = 0;
                    while((len = inputStream.read(buffer)) > 0) {
                        fileOutputStream.write(buffer, 0, len);
                    }
                }
            }
        } catch (FileUploadException | IOException e) {
            e.printStackTrace();
            throw new PictureException("伺服器繁忙請稍後在試");
        } finally {
            if(inputStream != null) {
                try {
                    inputStream.close();
                    if(fileOutputStream != null) {
                        fileOutputStream.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }
    }