Android - 将图像文件发送到服务器数据库

Question

用户保存三个数据:名称、注释 和图像。如您所见，下面的代码，我成功地编写了将名称和注释发送到服务器端的代码。但是，我不知道如何将选定的图像文件从设备发送到 serverDB。

public class AddEditWishlists extends Activity {

    // Client-Server - Start //////////////////////
    // Progress Dialog
    private ProgressDialog pDialog;

    JSONParser jsonParser = new JSONParser();
    EditText inputName;
    EditText inputDesc;

    // url to create new product
    private static String url_create_product = 
        "http://10.56.43.91/android_connect/create_product.php";


    // JSON Node names
    private static final String TAG_SUCCESS = "success";
    // Client-Server - End //////////////////////


    //Define Variables
    private EditText inputname;
    private EditText inputnote;
    private Button upload;
    private Bitmap yourSelectedImage;
    private ImageView inputphoto;
    private Button save;
    private int id;
    private byte[] blob=null;
    byte[] image=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.add_wishlist);
        setUpViews();
    }

    private void setUpViews() {

        inputname = (EditText) findViewById(R.id.inputname);
        inputnote = (EditText) findViewById(R.id.inputnote);
        inputphoto = (ImageView) findViewById(R.id.inputphoto); 

        Bundle extras = getIntent().getExtras();

        if (extras != null) {
            id=extras.getInt("id");
            inputname.setText(extras.getString("name"));
            inputnote.setText(extras.getString("note"));

            image = extras.getByteArray("blob");

            if (image != null) {
                if (image.length > 3) {
                    inputphoto.setImageBitmap(BitmapFactory.decodeByteArray(image,0,image.length));
                }
            }

        }



        //Image Upload Button
        upload = (Button) findViewById(R.id.upload);
        upload.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.setType("image/*");
                startActivityForResult(intent, 0);
            }
        });

        // Save the data
        save = (Button) findViewById(R.id.save);

        // Save하면 발생되는 이벤트
        save.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                if (inputname.getText().length() != 0) {
                    AsyncTask<Object, Object, Object> saveContactTask = new AsyncTask<Object, Object, Object>() {
                        @Override
                        protected Object doInBackground(Object... params) {
                            saveContact();

                            // Client-Server - Start //////////////////////////////////////
                            String name = inputname.getText().toString();
                            String description = inputnote.getText().toString();


                            // Building Parameters
                            List<NameValuePair> params1 = new ArrayList<NameValuePair>();
                            params1.add(new BasicNameValuePair("name", name));
                            params1.add(new BasicNameValuePair("description", description));

                            // getting JSON Object
                            // Note that create product url accepts POST method
                            JSONObject json = jsonParser.makeHttpRequest(url_create_product, "POST", params1);

                            // check log cat fro response
                            Log.d("Create Response", json.toString());

                            // check for success tag
                            try {
                                int success = json.getInt(TAG_SUCCESS);

                                if (success == 1) {
                                    // successfully created product
                                    // closing this screen
                                    finish();
                                } else {
                                    // failed to create product
                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                            // Client-Server - End ////////////////////////////////////

                            return null;
                        }

                        @Override
                        protected void onPostExecute(Object result) {
                            finish();
                        }
                    };

                    saveContactTask.execute((Object[]) null);

                } else {
                    AlertDialog.Builder alert = new AlertDialog.Builder(
                            AddEditWishlists.this);
                    alert.setTitle("Error In Save Wish List");
                    alert.setMessage("You need to Enter Name of the Product");
                    alert.setPositiveButton("OK", null);
                    alert.show();
                }
            }
        });
    }


    // If users save data, this will act (data -> db) 
    private void saveContact() {

        if(yourSelectedImage!=null){
            ByteArrayOutputStream outStr = new ByteArrayOutputStream();
            yourSelectedImage.compress(CompressFormat.JPEG, 100, outStr);
            blob = outStr.toByteArray();
        }

        else{blob=image;}

        // Change Text type to string type to save in the DB
        SQLiteConnector sqlCon = new SQLiteConnector(this);

        if (getIntent().getExtras() == null) {
            sqlCon.insertWishlist(inputname.getText().toString(), inputnote.getText().toString(), blob);
        }

        else {
            sqlCon.updateWishlist(id, inputname.getText().toString(), inputnote.getText().toString(),blob);
        }


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode,Intent resultdata) {
        super.onActivityResult(requestCode, resultCode, resultdata);
        switch (requestCode) {
        case 0:
            if (resultCode == RESULT_OK) {
                Uri selectedImage = resultdata.getData();
                String[] filePathColumn = { MediaStore.Images.Media.DATA };

                Cursor cursor = getContentResolver().query(selectedImage,
                        filePathColumn, null, null, null);
                cursor.moveToFirst();

                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                String filePath = cursor.getString(columnIndex);

                cursor.close();
                // Convert file path into bitmap image using below line.
                yourSelectedImage = BitmapFactory.decodeFile(filePath);
                inputphoto.setImageBitmap(yourSelectedImage);
            }

        }
    }

}

我如何在客户端-服务器注释之间编码以发送图像文件？..

Answer 1

您可以将选定的图像转换为 base 64 字符串，然后将该字符串传递给服务器，然后在服务器中对其进行解码，

检查这段代码将图像转换为base64，如果你有imageView那么你可以写这段代码，

imageView.buildDrawingCache();
Bitmap bm = imageView.getDrawingCache();
ByteArrayOutputStream baos = new ByteArrayOutputStream();  
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object   
byte[] b = baos.toByteArray();

String encodedImage = Base64.encodeToString(b , Base64.DEFAULT);

编辑

在您的代码中，您在这一行中有字节数组，

image = extras.getByteArray("blob");

所以之后就可以直接写这行代码了，

String encodedImage = Base64.encodeToString(image , Base64.DEFAULT);