我正在捕获图像，并将其保存到服务器路径中，它工作正常。捕获的图像看起来质量不错，但将图像保存到服务器后，其质量下降。
这是我的代码。
这是我的活动
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ByteArrayBody;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.json.JSONObject;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.VideoView;
public class PhotoIntentActivity extends Activity {
private static final int ACTION_TAKE_PHOTO_B = 1;
private Bitmap bitmap;
// private ProgressDialog dialog;
private static final String BITMAP_STORAGE_KEY = "viewbitmap";
private static final String IMAGEVIEW_VISIBILITY_STORAGE_KEY = "imageviewvisibility";
private ImageView mImageView;
private Bitmap mImageBitmap;
private static final String VIDEO_STORAGE_KEY = "viewvideo";
private static final String VIDEOVIEW_VISIBILITY_STORAGE_KEY = "videoviewvisibility";
private VideoView mVideoView;
private Uri mVideoUri;
private String mCurrentPhotoPath;
private File createImageFile() throws IOException {
File root = new File(Environment.getExternalStorageDirectory(), "Maya");
if (!root.exists()) {
root.mkdirs();
}
File file = new File(root, "android_" + System.currentTimeMillis()
+ ".JPEG");
return file;
}
private File setUpPhotoFile() throws IOException {
File f = createImageFile();
mCurrentPhotoPath = f.getAbsolutePath();
Log.d("onCreate", "Current file path is" + mCurrentPhotoPath);
return f;
}
private void setPic() {
int targetW = mImageView.getWidth();
int targetH = mImageView.getHeight();
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
int scaleFactor = 1;
if ((targetW > 0) || (targetH > 0)) {
scaleFactor = Math.min(photoW / targetW, photoH / targetH);
}
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;
Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
mImageView.setImageBitmap(bitmap);
mImageView.setVisibility(View.VISIBLE);
}
private void galleryAddPic() {
Intent mediaScanIntent = new Intent(
"android.intent.action.MEDIA_SCANNER_SCAN_FILE");
File f = new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
private void dispatchTakePictureIntent(int actionCode) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
switch (actionCode) {
case ACTION_TAKE_PHOTO_B:
File f = null;
try {
f = setUpPhotoFile();
mCurrentPhotoPath = f.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(f));
} catch (IOException e) {
e.printStackTrace();
f = null;
mCurrentPhotoPath = null;
}
break;
default:
break;
} // switch
startActivityForResult(takePictureIntent, actionCode);
}
private void handleBigCameraPhoto() {
if (mCurrentPhotoPath != null) {
Log.d("onCreate", "inside the handleBigCameraPhoto");
new ImageUploadTask().execute(mCurrentPhotoPath);
setPic();
galleryAddPic();
mCurrentPhotoPath = null;
}
}
Button.OnClickListener mTakePicOnClickListener = new Button.OnClickListener() {
@Override
public void onClick(View v) {
dispatchTakePictureIntent(ACTION_TAKE_PHOTO_B);
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mImageView = (ImageView) findViewById(R.id.imageView1);
mImageBitmap = null;
mVideoUri = null;
Button picBtn = (Button) findViewById(R.id.btnIntend);
setBtnListenerOrDisable(picBtn, mTakePicOnClickListener,
MediaStore.ACTION_IMAGE_CAPTURE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case ACTION_TAKE_PHOTO_B: {
if (resultCode == RESULT_OK) {
handleBigCameraPhoto();
}
break;
}
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putParcelable(BITMAP_STORAGE_KEY, mImageBitmap);
outState.putParcelable(VIDEO_STORAGE_KEY, mVideoUri);
outState.putBoolean(IMAGEVIEW_VISIBILITY_STORAGE_KEY,
(mImageBitmap != null));
outState.putBoolean(VIDEOVIEW_VISIBILITY_STORAGE_KEY,
(mVideoUri != null));
super.onSaveInstanceState(outState);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
mImageBitmap = savedInstanceState.getParcelable(BITMAP_STORAGE_KEY);
mVideoUri = savedInstanceState.getParcelable(VIDEO_STORAGE_KEY);
mImageView.setImageBitmap(mImageBitmap);
mImageView
.setVisibility(savedInstanceState
.getBoolean(IMAGEVIEW_VISIBILITY_STORAGE_KEY) ? ImageView.VISIBLE
: ImageView.INVISIBLE);
mVideoView.setVideoURI(mVideoUri);
mVideoView
.setVisibility(savedInstanceState
.getBoolean(VIDEOVIEW_VISIBILITY_STORAGE_KEY) ? ImageView.VISIBLE
: ImageView.INVISIBLE);
}
public static boolean isIntentAvailable(Context context, String action) {
final PackageManager packageManager = context.getPackageManager();
final Intent intent = new Intent(action);
List<ResolveInfo> list = packageManager.queryIntentActivities(intent,
PackageManager.MATCH_DEFAULT_ONLY);
return list.size() > 0;
}
private void setBtnListenerOrDisable(Button btn,
Button.OnClickListener onClickListener, String intentName) {
if (isIntentAvailable(this, intentName)) {
btn.setOnClickListener(onClickListener);
} else {
btn.setText(getText(R.string.cannot).toString() + " "
+ btn.getText());
btn.setClickable(false);
}
}
class ImageUploadTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
try {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(params[0], o);
final int REQUIRED_SIZE = 1024;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
bitmap = BitmapFactory.decodeFile(params[0], o2);
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost(
"http://192.168.1.113:9080/MavenWeb/ImageSaverServlet");
MultipartEntity entity = new MultipartEntity(
HttpMultipartMode.BROWSER_COMPATIBLE);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.JPEG, 100, bos);
byte[] data = bos.toByteArray();
entity.addPart("uploaded", new ByteArrayBody(data,
"myImage.jpg"));
// entity.addPart("photoCaption","Maya's");
httpPost.setEntity(entity);
HttpResponse response = httpClient.execute(httpPost,
localContext);
BufferedReader reader = new BufferedReader(
new InputStreamReader(
response.getEntity().getContent(), "UTF-8"));
String sResponse = reader.readLine();
return sResponse;
} catch (Exception e) {
return null;
}
}
@Override
protected void onPostExecute(String sResponse) {
try {
if (sResponse != null) {
JSONObject JResponse = new JSONObject(sResponse);
int success = JResponse.getInt("SUCCESS");
String message = JResponse.getString("MESSAGE");
if (success == 0) {
Toast.makeText(getApplicationContext(), message,
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),
"Photo uploaded successfully",
Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
Log.e(e.getClass().getName(), e.getMessage(), e);
}
}
}
我的服务器端 ImageSaverServlet 是
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class ImageSaverServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
if ( ServletFileUpload.isMultipartContent( request ))
{
List<FileItem> fileItems;
try {
fileItems = new ServletFileUpload( new DiskFileItemFactory( )).
parseRequest( request );
for ( FileItem item : fileItems )
{
String fieldName = item.getFieldName();
if ( item.isFormField())
{ item.getString() ;
}
else
{
try {
final BufferedImage bufferedImage = ImageIO.read(item.getInputStream());
File dir = new File("d:\\mayaImage");
dir.mkdir();
File imageFile = new File(dir+"\\newrose2.jpg");
ImageIO.write(bufferedImage, "jpg",imageFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
需要建议，为什么它会降低我的质量。
Thanks.
