Android上使用camera拍照，把获取的照片上传到远程服务器

使用Java上传文件

从Apache Software Foundation下载HttpClient 4.3.4。

在工程中添加下面的jar包：

参考sample，写一个简单的上传：

public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpPost httppost = new HttpPost("http://localhost:8003/savetofile.php"); // your server

            FileBody bin = new FileBody(new File("my.jpg")); // image for uploading

            HttpEntity reqEntity = MultipartEntityBuilder.create()
                    .addPart("myFile", bin)
                    .build();

            httppost.setEntity(reqEntity);

            System.out.println("executing request " + httppost.getRequestLine());
            CloseableHttpResponse response = httpclient.execute(httppost);
            try {
                System.out.println("----------------------------------------");
                System.out.println(response.getStatusLine());
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    System.out.println("Response content length: " + resEntity.getContentLength());
                }
                EntityUtils.consume(resEntity);
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }
    }

Android上拍照

Camera的使用很简单，只需要参考开发者网站的这篇Taking Photos Simply。

调用系统camera只需要如下代码：

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); startActivityForResult(intent, 0);

拍照之后，camera会返回缩略图：

protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == 0 && resultCode == RESULT_OK) { Bundle extras = data.getExtras(); Bitmap imageBitmap = (Bitmap) extras.get("data"); mImageView.setImageBitmap(imageBitmap); } }

如果要获得高质量的图，就需要指定照片的保存路径。在AndroidManifest.xml中添加下面的权限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

修改调用方法：

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); Intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile)); startActivityForResult(intent, 0);

拍照之后，使用预设的图片路径解码，就可以获取高质量的图：

protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == 0 && resultCode == Activity.RESULT_OK) { setPic(); } } private void setPic() { // Get the dimensions of the View int targetW = mImageView.getWidth(); int targetH = mImageView.getHeight(); // Get the dimensions of the bitmap BitmapFactory.Options bmOptions = new BitmapFactory.Options(); bmOptions.inJustDecodeBounds = true; BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); int photoW = bmOptions.outWidth; int photoH = bmOptions.outHeight; // Determine how much to scale down the image int scaleFactor = Math.min(photoW/targetW, photoH/targetH); // Decode the image file into a Bitmap sized to fill the View bmOptions.inJustDecodeBounds = false; bmOptions.inSampleSize = scaleFactor; bmOptions.inPurgeable = true; Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions); mImageView.setImageBitmap(bitmap); }

从Android客户端传送图片到PHP服务器

要访问Internet，在AndroidManifest.xml中添加访问权限：

<uses-permission android:name="android.permission.INTERNET"/>

参考http://blog.rafaelsanches.com/2011/01/29/upload-using-multipart-post-using-httpclient-in-android/，创建一个类MultipartEntity：

public class MultipartEntity implements HttpEntity { private String boundary = null; ByteArrayOutputStream out = new ByteArrayOutputStream(); boolean isSetLast = false; boolean isSetFirst = false; public MultipartEntity() { this.boundary = System.currentTimeMillis() + ""; } public void writeFirstBoundaryIfNeeds(){ if(!isSetFirst){ try { out.write(("--" + boundary + "\r\n").getBytes()); } catch (final IOException e) { } } isSetFirst = true; } public void writeLastBoundaryIfNeeds() { if(isSetLast){ return ; } try { out.write(("\r\n--" + boundary + "--\r\n").getBytes()); } catch (final IOException e) { } isSetLast = true; } public void addPart(final String key, final String value) { writeFirstBoundaryIfNeeds(); try { out.write(("Content-Disposition: form-data; name=\"" +key+"\"\r\n").getBytes()); out.write("Content-Type: text/plain; charset=UTF-8\r\n".getBytes()); out.write("Content-Transfer-Encoding: 8bit\r\n\r\n".getBytes()); out.write(value.getBytes()); out.write(("\r\n--" + boundary + "\r\n").getBytes()); } catch (final IOException e) { } } public void addPart(final String key, final String fileName, final InputStream fin){ addPart(key, fileName, fin, "application/octet-stream"); } public void addPart(final String key, final String fileName, final InputStream fin, String type){ writeFirstBoundaryIfNeeds(); try { type = "Content-Type: "+type+"\r\n"; out.write(("Content-Disposition: form-data; name=\""+ key+"\"; filename=\"" + fileName + "\"\r\n").getBytes()); out.write(type.getBytes()); out.write("Content-Transfer-Encoding: binary\r\n\r\n".getBytes()); final byte[] tmp = new byte[4096]; int l = 0; while ((l = fin.read(tmp)) != -1) { out.write(tmp, 0, l); } out.flush(); } catch (final IOException e) { } finally { try { fin.close(); } catch (final IOException e) { } } } public void addPart(final String key, final File value) { try { addPart(key, value.getName(), new FileInputStream(value)); } catch (final FileNotFoundException e) { } } @Override public long getContentLength() { writeLastBoundaryIfNeeds(); return out.toByteArray().length; } @Override public Header getContentType() { return new BasicHeader("Content-Type", "multipart/form-data; boundary=" + boundary); } @Override public boolean isChunked() { return false; } @Override public boolean isRepeatable() { return false; } @Override public boolean isStreaming() { return false; } @Override public void writeTo(final OutputStream outstream) throws IOException { outstream.write(out.toByteArray()); } @Override public Header getContentEncoding() { return null; } @Override public void consumeContent() throws IOException, UnsupportedOperationException { if (isStreaming()) { throw new UnsupportedOperationException( "Streaming entity does not implement #consumeContent()"); } } @Override public InputStream getContent() throws IOException, UnsupportedOperationException { return new ByteArrayInputStream(out.toByteArray()); } }

使用AsyncTask来完成上传：

private class UploadTask extends AsyncTask<Bitmap, Void, Void> {

        protected Void doInBackground(Bitmap... bitmaps) {
            if (bitmaps[0] == null)
                return null;

            Bitmap bitmap = bitmaps[0];
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream); // convert Bitmap to ByteArrayOutputStream
            InputStream in = new ByteArrayInputStream(stream.toByteArray()); // convert ByteArrayOutputStream to ByteArrayInputStream

            DefaultHttpClient httpclient = new DefaultHttpClient();
            try {
                HttpPost httppost = new HttpPost(
                        "http://192.168.8.84:8003/savetofile.php"); // server

                MultipartEntity reqEntity = new MultipartEntity();
                reqEntity.addPart("myFile",
                        System.currentTimeMillis() + ".jpg", in);
                httppost.setEntity(reqEntity);

                Log.i(TAG, "request " + httppost.getRequestLine());
                HttpResponse response = null;
                try {
                    response = httpclient.execute(httppost);
                } catch (ClientProtocolException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                try {
                    if (response != null)
                        Log.i(TAG, "response " + response.getStatusLine().toString());
                } finally {

                }
            } finally {

            }

            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

            if (stream != null) {
                try {
                    stream.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            Toast.makeText(MainActivity.this, R.string.uploaded, Toast.LENGTH_LONG).show();
        }
    }

代码

https://github.com/DynamsoftRD/JavaHTTPUpload

Git clone https://github.com/DynamsoftRD/JavaHTTPUpload.git