Question

新手问题在这里，所以我以blob的形式上传图片，我遵循教程。我现在的问题是我想在特定的电子邮件上传我的图像，这意味着我放入电子邮件，图像将上传到数据库中的特定电子邮件。香港专业教育学院完成了上传图片部分，但不知道如何把电子邮件。 tqvm in advanced。

1.MainActivity.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

public static final String UPLOAD_URL = "http://10.0.3.2/AndroidImageBlob/upload.php";
public static final String UPLOAD_KEY = "image";
public static final String TAG = "MY MESSAGE";

private int PICK_IMAGE_REQUEST = 1;

private Button buttonChoose;
private Button buttonUpload;

private EditText editTextId;

private ImageView imageView;

private Bitmap bitmap;

private Uri filePath;



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

    editTextId = (EditText) findViewById(R.id.editTextId);

    buttonChoose = (Button) findViewById(R.id.buttonChoose);
    buttonUpload = (Button) findViewById(R.id.buttonUpload);

    imageView = (ImageView) findViewById(R.id.imageView);

    buttonChoose.setOnClickListener(this);
    buttonUpload.setOnClickListener(this);
}

private void showFileChooser() {
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {

        filePath = data.getData();
        try {
            bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
            imageView.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}


public String getStringImage(Bitmap bmp){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] imageBytes = baos.toByteArray();
    String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
    return encodedImage;
}

private void uploadImage(){

    class UploadImage extends AsyncTask<Bitmap,Void,String> {

        ProgressDialog loading;
        RequestHandler rh = new RequestHandler();

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            loading = ProgressDialog.show(MainActivity.this, "Uploading Image", "Please wait...", true, true);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            loading.dismiss();
            Toast.makeText(getApplicationContext(), s, Toast.LENGTH_LONG).show();
        }

        @Override
        protected String doInBackground(Bitmap...params) {
            Bitmap bitmap = params[0];
            String uploadImage = getStringImage(bitmap);

            HashMap<String,String> data = new HashMap<>();
            data.put(UPLOAD_KEY, uploadImage);

            String result = rh.sendPostRequest(UPLOAD_URL,data);

            return result;
        }


    }

    UploadImage ui = new UploadImage();
    ui.execute(bitmap);
}

@Override
public void onClick(View v) {
    if (v == buttonChoose) {
        showFileChooser();
    }
    if(v == buttonUpload){
        uploadImage();
    }
}
}

2.RequestHandler.java

public class RequestHandler {

public String sendGetRequest(String uri) {
    try {
        URL url = new URL(uri);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));

        String result;

        StringBuilder sb = new StringBuilder();

        while((result = bufferedReader.readLine())!=null){
            sb.append(result);
        }

        return sb.toString();
    } catch (Exception e) {
        return null;
    }
}

public String sendPostRequest(String requestURL,
                              HashMap<String, String> postDataParams) {

    URL url;
    String response = "";
    try {
        url = new URL(requestURL);

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setReadTimeout(15000);
        conn.setConnectTimeout(15000);
        conn.setRequestMethod("POST");
        conn.setDoInput(true);
        conn.setDoOutput(true);


        OutputStream os = conn.getOutputStream();
        BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(os, "UTF-8"));
        writer.write(getPostDataString(postDataParams));

        writer.flush();
        writer.close();
        os.close();
        int responseCode = conn.getResponseCode();

        if (responseCode == HttpsURLConnection.HTTP_OK) {
            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            response = br.readLine();
        } else {
            response = "Error Registering";
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return response;
}

private String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException {
    StringBuilder result = new StringBuilder();
    boolean first = true;
    for (Map.Entry<String, String> entry : params.entrySet()) {
        if (first)
            first = false;
        else
            result.append("&");

        result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
        result.append("=");
        result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
    }

    return result.toString();
}
}

3.upload.php

<?php

 if($_SERVER['REQUEST_METHOD']=='POST'){

 $username = $_POST['username'];
 $image = $_POST['image'];

 require_once('dbConnect.php');

 $sql = "INSERT INTO android_image (image) VALUES (?) WHERE username  ='".$username."'";

 $stmt = mysqli_prepare($con,$sql);

 mysqli_stmt_bind_param($stmt,"s",$image);
 mysqli_stmt_execute($stmt);

 $check = mysqli_stmt_affected_rows($stmt);

     if($check == 1)
     {
     echo "Image Uploaded Successfully";
     }
     else
     {
     echo "Error Uploading Image";
     }
     mysqli_close($con);
 }
 else
 {
 echo "Error";
 }

Answer 1

将其添加到您的Hashmap中，如下所示：

HashMap<String,String> data = new HashMap<>();
data.put(UPLOAD_KEY, uploadImage);
data.put("id", [your value for the id]);

在服务器端，如果您使用的是PHP，则可以使用id获取$_POST["id"]的值。

如何在将图像上传到数据库时验证电子邮件

1 个答案: