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[操作系统]Android4.4 + WebAPI 实现拍照上传


     网上有很多关于拍照上传的实现方法,如果用新版本android去运行有可能会发现根本实现不了。主要原因是android从4.4版本开始通过intent.ACTION_GET_CONTENT打开选择器后,getData()返回的URI没有包含真实的文件路径,而是像这样“content://com.android.providers.media.documents/document/image:1234”,以至于用传统的方式找不到图片的路径。最简单的解决办法是用intent.ACTION_PICK代替intent.ACTION_GET_CONTENT。下面给出4.4版本后拍照上传的具体实现方法:

第一步:点击拍照按钮代码

    //点击拍照    btnHeadCamera.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View view) {        Intent itCamera=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);        startActivityForResult(itCamera,0);      }    });

 

第二步:保存拍照图片代码

@Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    switch (requestCode){      case 0://拍照        savePhoto(data);        break;    }    super.onActivityResult(requestCode, resultCode, data);  }
  final String SAVE_PATH=Environment.getExternalStorageDirectory()+"/my_head.jpg"; //拍照后保存路径 
//保存图片
public void savePhoto(Intent it){ Bundle bundle=it.getExtras(); if(bundle!=null){ Bitmap photo = bundle.getParcelable("data"); imgHead.setImageBitmap(photo); File fileHead=new File(SAVE_PATH); try { if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){ if(!fileHead.getParentFile().exists()){ fileHead.getParentFile().mkdir(); } BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(fileHead)); photo.compress(Bitmap.CompressFormat.JPEG,80,bos); bos.flush(); bos.close(); }else { Toast toast = Toast.makeText(HeadPhotoActivity.this, "保存失败!", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } }catch (FileNotFoundException e){ e.printStackTrace(); }catch (IOException e){ e.printStackTrace(); } } }


第三步:上传图片代码

String SERVER_URL = Config.PhotoAPI+"/UploadImage";//上传的服务端API地址

btnHeadCancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { new Thread(new Runnable() { @Override public void run() { File file = new File(SAVE_PATH); Message msg = new Message(); msg.what = 0; if(file!=null) { try { int re = ImageUtils.uploadForm(file, SERVER_URL); msg.obj = re; } catch (IOException ex) { msg.obj = 0; Toast.makeText(HeadPhotoActivity.this, "上传失败", Toast.LENGTH_SHORT).show(); } handler.sendMessage(msg); }else { Toast.makeText(HeadPhotoActivity.this, "找不到上传图片", Toast.LENGTH_SHORT).show(); } } }).start(); } });

 

final Handler handler=new Handler(){      @Override      public void handleMessage(Message msg) {        switch (msg.what) {          case 0:            if ((int)msg.obj == 1) {              Toast.makeText(HeadPhotoActivity.this, "上传成功", Toast.LENGTH_SHORT).show();            } else {              Toast.makeText(HeadPhotoActivity.this, "上传失败", Toast.LENGTH_SHORT).show();            }            break;        }      }    };

 

  /**   *   * @param uploadFile   *      需要上传的文件   * @param serverUrl   *      上传的服务器的路径   * @throws IOException   */  public static int uploadForm(File uploadFile, String serverUrl)      throws IOException {    int re=0;    String fileName = uploadFile.getName();    StringBuilder sb = new StringBuilder();    sb.append("--" + BOUNDARY + "\r\n");    sb.append("Content-Disposition: form-data; name=\"" + fileName        + "\"; filename=\"" + fileName + "\"" + "\r\n");    sb.append("Content-Type: image/jpeg" + "\r\n");    sb.append("\r\n");    byte[] headerInfo = sb.toString().getBytes("UTF-8");    byte[] endInfo = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("UTF-8");    System.out.println(sb.toString());    URL url = new URL(serverUrl);    HttpURLConnection conn = (HttpURLConnection) url.openConnection();    conn.setRequestMethod("POST");    conn.setRequestProperty("Content-Type",        "multipart/form-data; boundary=" + BOUNDARY);    conn.setRequestProperty("Content-Length", String        .valueOf(headerInfo.length + uploadFile.length()            + endInfo.length));    conn.setDoOutput(true);    OutputStream out = conn.getOutputStream();    InputStream in = new FileInputStream(uploadFile);    out.write(headerInfo);    byte[] buf = new byte[1024];    int len;    while ((len = in.read(buf)) != -1)      out.write(buf, 0, len);    out.write(endInfo);    in.close();    out.close();    if (conn.getResponseCode() == 200) {      re=1;    }    return re;  }

 

最后给出服务端WebAPI代码:

    [HttpPost]    public async Task<HttpResponseMessage> UploadImage()    {
string filePath = "~\\UploadFiles\\Photo"; // 取得文件夹 string dir = HttpContext.Current.Server.MapPath(filePath); //如果不存在文件夹,就创建文件夹 if (!Directory.Exists(dir)) Directory.CreateDirectory(dir); if (!Request.Content.IsMimeMultipartContent("form-data")) { throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); } var provider = new CustomMultipartFormDataStreamProvider(dir); try { // Read the form data. await Request.Content.ReadAsMultipartAsync(provider); foreach (MultipartFileData file in provider.FileData) { //file.Headers.ContentDisposition.FileName;//上传文件前的文件名 //file.LocalFileName;//上传后的文件名 Photo p = new Photo(); p.ImgInfo = file.LocalFileName.Substring(file.LocalFileName.LastIndexOf("\\")); p.Sort = "员工相册"; p.AddUser = "admin"; p.AddTime = DateTime.Now; p.Url = filePath + p.ImgInfo; db.Photo.Add(p); db.SaveChanges(); } return Request.CreateResponse(HttpStatusCode.OK);
} catch { return Request.CreateResponse(HttpStatusCode.BadRequest);
} }

  //重写上传文件名  public class CustomMultipartFormDataStreamProvider : MultipartFormDataStreamProvider   {    public CustomMultipartFormDataStreamProvider(string path)      : base(path)    { }    public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers)    {      string fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff");      return fileName + "_" + headers.ContentDisposition.FileName.Replace("\"", string.Empty);//base.GetLocalFileName(headers);    }  }