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);
   }
 }