Android4.4 WebAPI实现拍照上传功能

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);
    }
  }

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