php - Android将文件上传到服务器导致OOM
问题描述
只是在这里需要一些帮助。我正在开发一个 Android 应用程序来帮助人们将文件备份到共享网络服务器（现在共享，可能很快会迁移到托管我自己的服务器）。
到目前为止，我已经设法让这个应用程序在我的手机（华为 P9 Lite，OS 6）上运行，并且在一个出现 OOM 错误的测试仪上遇到了问题。我认为它可能是设备，因为没有其他人有问题。另一个用户现在收到错误。最主要的是，它是零星的，不一致的。
根据我的研究和我有限的知识（这里的前德尔福开发人员，一切都为我们完成了 :) 我需要确保删除不再需要的引用。我看了这个页面，我认为我在代码中没有做错任何事情：https ://android.jlelse.eu/9-ways-to-avoid-memory-leaks-in-android-b6d81648e35e 我走了通过代码，我找不到可以优化的地方。
我已将以下内容添加到我的清单中：
android:largeHeap="true"
android:hardwareAccelerated="false"
任何人都可以在这里指导我。
我的问题的第 2 部分是，目前我连接到服务器并检查文件是否存在，如果不存在，我复制上传的文件。我认为这可能不是最有效的做事方式。是否值得单独检查文件是否存在，将其存储在变量中然后仅上传？
我考虑过的其他事情是：
将文件名存储在服务器上的 MySQL 数据库中，进行单独的查询，如果不存在，则上传。我考虑使用共享首选项，但不希望用户在重新安装时失去进度。
有什么想法吗？下面的代码：
public class UploadToServer extends Activity {
TextView messageText;
Button uploadButton;
Button testButton;
Button LoginButton;
Button NewHttpButton;
Button newLogButton;
Boolean haveperm = false;
int serverResponseCode = 0;
int itemcount = 0;
int totalfilescount = 0;
int uploadcount = 0;
boolean busy = false;
String upLoadServerUri = null;
/********** File Path *************/
String uploadFilePath = Environment.getExternalStorageDirectory().toString() + "/My Folder"; //- evenutally will be a list that will be looped through
String uploadFileName = "hello.png";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bugsnag.start(this);
setContentView(R.layout.activity_upload_to_server);
uploadButton = (Button) findViewById(R.id.uploadButton);
messageText = (TextView) findViewById(R.id.messageText);
/************* Php script path ****************/
upLoadServerUri = "pathtoserver and php file"; // php file checks if the file exists and copies if not
uploadButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (!busy) {
busy = true;
if (ContextCompat.checkSelfPermission(UploadToServer.this,
Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
ActivityCompat
.requestPermissions(
UploadToServer.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
100);
} else {
haveperm = true;
}
if (haveperm) {
new Thread(new Runnable() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("uploading started - please be patient as this may take a while");
}
});
File f;
f = new File(uploadFilePath);
try {
if (f.exists() && f.isDirectory()) {
File file[] = f.listFiles();
totalfilescount = f.listFiles().length;
if (file != null) {
itemcount = 0;
for (int i = 0; i < file.length; i++) {
uploadFileName = file[i].getName();
uploadFile(uploadFilePath + "/" + uploadFileName);
}
}
}
busy = false;
} catch (NullPointerException e) {
throw new IllegalStateException("Not found:" + uploadFilePath, e);
}
}
}).start();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Completed");
}
});
} else {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(getApplicationContext(), "Still busy with this, please wait",
Toast.LENGTH_SHORT).show();
}
});
}
}
});
}
public static void displayDirectoryContents(File dir) {
try {
File[] files = dir.listFiles();
for (File file : files) {
if (file.isDirectory()) {
System.out.println("directory:" + file.getCanonicalPath());
displayDirectoryContents(file);
} else {
//System.out.println(" file:" + file.getCanonicalPath());
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
public int uploadFile(String sourceFileUri) {
String fileName = sourceFileUri;
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File sourceFile = new File(sourceFileUri);
busy = true;
if (!sourceFile.isFile()) {
return 0;
} else {
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");//30122020
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
//conn.setRequestProperty("Content-Length", Integer.toString(fileInputStream.available())); //took this out as it was causing exceeded content-length limit
// conn.setDoOutput(true);
conn.setRequestProperty("uploaded_file", fileName);//20012021
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ fileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
if (serverResponseCode == 200) {
itemcount++;
uploadcount++;
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("File " + String.valueOf(itemcount) + " of " + String.valueOf(totalfilescount) + " Files Uploaded successfully");
}
});
} else {
runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(UploadToServer.this, "Failed" + String.valueOf(serverResponseCode),
Toast.LENGTH_SHORT).show();
}
});
}//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
//dialog.dismiss();
ex.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("MalformedURLException Exception : check script url.");
// Toast.makeText(UploadToServer.this, "MalformedURLException", Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
// dialog.dismiss();
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
// messageText.setText("Got Exception : see logcat ");
messageText.setText(e.getMessage());
// Toast.makeText(UploadToServer.this, "Got Exception : see logcat ",
// Toast.LENGTH_SHORT).show();
}
});
Log.e("Exception", "Exception : "
+ e.getMessage(), e);
}
// dialog.dismiss();
return serverResponseCode;
} // End else block
}
}
php文件：
<?php
$file_path = "uploads/";
$file_path = $file_path . basename( $_FILES['uploaded_file']['name']);
if(!file_exists($file_path)) {
if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $file_path)) {
echo "success";
} else{
echo "fail";
}
}
?>
解决方案
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