如何通过发布请求向服务器发送从设备加载到 ImageView 中的图像。有一个流向服务器发送文本：
public class PostThreadUrl extends AsyncTask<JSONObject, Void, Void> {
HttpURLConnection urlConnection = null;
BufferedOutputStream bos = null;
@Override
protected Void doInBackground(JSONObject... jsonObjects) {
String urlString = "http://newsyou.000webhostapp.com/AddNews.php"; // URL to call
String urlParameters = null;
try {
urlParameters = "title=" + jsonObjects[0].getString("title") + "&text=" + jsonObjects[0].getString("text") + "&id=" + jsonObjects[0].getString("id");
} catch (JSONException e) {
e.printStackTrace();
}
byte[] postData = urlParameters.getBytes( Charset.defaultCharset() );
int postDataLength = postData.length;
String request = urlString;
URL url = null;
try {
url = new URL( request );
} catch (MalformedURLException e) {
e.printStackTrace();
}
HttpURLConnection conn= null;
try {
conn = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
e.printStackTrace();
}
conn.setDoOutput( true );
conn.setInstanceFollowRedirects( false );
try {
conn.setRequestMethod( "POST" );
} catch (ProtocolException e) {
e.printStackTrace();
}
conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty( "charset", "utf-8");
conn.setRequestProperty( "Content-Length", Integer.toString( postDataLength ));
conn.setUseCaches( false );
DataOutputStream wr = null;
try {
wr = new DataOutputStream( conn.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
}
try {
wr.write( postData );
} catch (IOException e) {
e.printStackTrace();
}
InputStream inputStream= null;
try {
inputStream = conn.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}
InputStreamReader isr =new InputStreamReader(inputStream);
BufferedReader bRead=new BufferedReader(isr);
StringBuilder sBuilder=new StringBuilder();
String line;
try {
while ((line = bRead.readLine()) != null) {
sBuilder.append(line);
}
}catch (Exception e){
}
return null;
}
}
在 ImageView 中加载图像：
public class NewsReaderActivity extends AppCompatActivity {
private final int Pick_image = 1;
private ImageView imgAdd;
private String ImagePath="";
private File finalFile;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news_reader);
imgAdd = findViewById(R.id.imageAdd);
Button btnLoadImg =findViewById(R.id.LoadImgBtn);
final Intent intent = this.getIntent();
btnLoadImg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {//событие при котором выполняется поиск картинки
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, Pick_image);
}
});
((Button)findViewById(R.id.AddNewsBtn)).setOnClickListener(new View.OnClickListener() {//cобытие при котором происходит загрузка на сервер
@Override
public void onClick(View v) {
TextView Title=findViewById(R.id.titleAdd);
TextView Text=findViewById(R.id.textAdd);
if((!Title.getText().toString().equals(""))&&(!Text.getText().toString().equals(""))){
try {
Integer id=intent.getIntExtra("id",0);
JSONObject jsonObject = new JSONObject();
jsonObject.put("title", Title.getText().toString());
jsonObject.put("text", Title.getText().toString());
jsonObject.put("id", id.toString());
new PostThreadUrl().execute(jsonObject);
} catch (JSONException e) {
e.printStackTrace();
}
}else{
Toast.makeText(NewsReaderActivity.this,"Заполнитте все текстовые поля",Toast.LENGTH_SHORT).show();
}
}
});
}
public String getRealPathFromURI(Uri uri) {
Cursor cursor = getContentResolver().query(uri, null, null, null, null);
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
return cursor.getString(idx);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
switch(requestCode) {
case Pick_image: {
if (resultCode == RESULT_OK) {
try {
final Uri imageUri = imageReturnedIntent.getData();
final InputStream imageStream = getContentResolver().openInputStream(imageUri);
final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);
finalFile = new File(getRealPathFromURI(imageUri));
ImagePath=finalFile.toString();//Путь к картинке
imgAdd.setImageBitmap(selectedImage);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
}
}
}
接受 post 请求的 php 文件：
<?php
function getRandomFileName($path, $extension=''){
$extension = $extension ? '.' . $extension : '';
$path = $path ? $path . '/' : '';
do {
$name = md5(microtime() . rand(0, 9999));
$file = $path . $name . $extension;
} while (file_exists($file));
return $name;
}
$path = 'img';
$target='';
if($_POST['src']!=""){
$extension = strtolower(substr(strrchr($_FILES['img']['name'], '.'), 1));
$filename = getRandomFileName($path, $extension);
$target = $path . '/' . $filename . '.' . $extension;
move_uploaded_file($_FILES['img']['tmp_name'], $target);
}
$host = 'localhost';
$database = 'NewsBase';
$user = 'mysql';
$password = 'mysql';
$link = mysqli_connect($host, $user, $password, $database) or die("Ошибка " . mysqli_error($link));
$query ="INSERT INTO `News`(`id`, `src`, `title`, `Text`, `a_id`) VALUES (null,'".$target."','".$_POST['title']."','".$_POST['text']."',".$_POST['id'].")";
echo $query;
$result = mysqli_query($link, $query) or die("Ошибка " . mysqli_error($link));
mysqli_close($link);
?>
1 个回答