多图片上传Android服务器端实现

 最近时间在做的项目中需要用到 Android 前端上传服务器, 第一次做文件上传的服务器端, 查了各种资料, 踩了各种坑, 记录一下最终的实现方式
** 一. 服务器端 **
    服务器端使用的是 ssh 框架, 文件实现逻辑:
        1. 获取用户上传的文件
        2. 将文件保存到文件夹
        3. 保存成功后将文件的索引存入数据库,
    1. 获取用户上传的文件
        完整 action 如下:
    

public class UploadAction extends ActionSupport implements ModelDriven<QualityBean>, ServletResponseAware, ServletRequestAware {
    private HttpServletResponse response;
    private HttpServletRequest request;
    //********* 重点 ******
    // 多文件上传的文件 key, 相当于获取 request.getParameter(key)
    // 如果传入的 key 不对, 上传的文件为空, 报空指针异常,
    private List<File> file;

    private List<String> fileFileName;

    private List<String> fileContentType;

    private List<String> dataUrl;

    public void setDataUrl(List<String> dataUrl) {this.dataUrl = dataUrl;}

    public List<File> getFile() {return file;}

    public void setFile(List<File> file) {this.file = file;}

    public List<String> getFileFileName() {return fileFileName;}

    public void setFileFileName(List<String> fileFileName) {this.fileFileName = fileFileName;}

    public List<String> getFileContentType() {return fileContentType;}

    public void setFileContentType(List<String> fileContentType) {this.fileContentType = fileContentType;}

    private QualityBean bean = new QualityBean();

    public void setBean(QualityBean bean) {this.bean = bean;}

    public String upload() throws Exception {dataUrl = new ArrayList<String>();
        String imgpath = "D:/loadtest";
        System.out.println("file-size" + file.size());
        if (file != null) {for (int i = 0; i < file.size(); ++i) {InputStream is = new FileInputStream(file.get(i));
                dataUrl.add(imgpath + this.getFileFileName().get(i));
                File destFile = new File(imgpath, this.getFileFileName().get(i));
                OutputStream os = new FileOutputStream(destFile);
                byte[] buffer = new byte[400];
                int length = 0;
                while ((length = is.read(buffer)) > 0) {os.write(buffer, 0, length);
                }
                is.close();
                os.close();
                // 往数据库添加 -- 略
                // 返回数据, 真实项目中返回自己逻辑判断
                BooleanBean bean = new BooleanBean();
                bean.setUpdate(true);
                DataUtils.writeBeanDate(response, bean);
              
            }
        }
        return null;
    }

    @Override
    public void setServletRequest(HttpServletRequest httpServletRequest) {this.request = httpServletRequest;}

    @Override
    public void setServletResponse(HttpServletResponse httpServletResponse) {this.response = httpServletResponse;}

    @Override
    public QualityBean getModel() {return bean;}
}

** 二.Android 端代码实现 **

        final List<String> list = new ArrayList<>();
        list.add("/storage/emulated/0/Boohee/1565153408424.jpg");
        list.add("/storage/emulated/0/Boohee/1564797245581.jpg");
        submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {Map<String, RequestBody> params = new HashMap<>();
                RequestBody pictureNameBody = RequestBody.create(MediaType.parse("multipart/form-data"), "file");
                for (String str : list) {File picture = new File(str);
                    RequestBody requestFile = RequestBody.create(MediaType.parse("multipart/form-data"), picture);
                    params.put("file\"; filename=\""+ picture.getName() +"", requestFile);
                }
                mvpPresenter.submit("韶关 1 店",pictureNameBody, params);
            }
        });

上面 file 作为文件上传的 key, 两端必须保持一致