Question

我创建了一个PHP脚本，允许我在MySQL数据库中保存来自HTML页面（表单POST）的图像，它做得很好，我可以看到表格中的行，也可以在浏览器中显示它们使用另一个名为 load_image_from_db.php 的PHP脚本。但是，当通过Android应用程序保存图像时，存在一些问题。

我可以使用android应用程序将图像上传到MySQL数据库，保存图像，我可以在PHPmyAdmin的表格中看到它们，但是当我尝试使用相同的PHP脚本显示它们时 load_image_from_db.php 它们不会显示（显示一个小的矩形矩形）。

我发现当我通过Form.html保存图像时需要32Kio，当我通过Android应用程序保存相同的图像时，它需要phpMyAdmin中的105 Kio（所有图像大约为* 3。

我将用于保存图像的java代码发布到MySQL DB中：

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;
}

 @Override
        protected String doInBackground(Bitmap... params) {
            RequestHandler rh = new RequestHandler();
            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);

RequestHandler类：

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();


}

upload_image.php

<?php

	if($_SERVER['REQUEST_METHOD']=='POST'){
		$con = mysqli_connect("localhost","root","","othmane");
		
		$image = $_POST['image'];
		
		$sql = "INSERT INTO images (image) VALUES (?)";

		$stmt = mysqli_prepare($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";
	}
	?>

无法使用Android应用程序将图像保存到MySQL

0 个答案: