我尝试将文件上传到服务器，然后尝试使用
public class UploadFiles extends Activity {
TextView messageText;
Button uploadButton;
int serverResponseCode = 0;
ProgressDialog dialog = null;
String upLoadServerUri = null;
final String uploadFilePath = "mypath";
final String uploadFileName = "myfile";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_server);
uploadButton = (Button)findViewById(R.id.uploadButton);
messageText = (TextView)findViewById(R.id.messageText);
messageText.setText("Uploading file path :- 'path"+uploadFileName+"'");
upLoadServerUri = "serverpath";
uploadButton.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
dialog = ProgressDialog.show(UploadToServer.this, "", "Uploading file...", true);
new Thread(new Runnable()
{
public void run()
{
runOnUiThread(new Runnable()
{
public void run()
{
messageText.setText("uploading started.....");
}
});
uploadFile(uploadFilePath + "" + uploadFileName);
}
}).start();
}
});
}
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);
if (!sourceFile.isFile())
{
dialog.dismiss();
Log.e("uploadFile", "Source File not exist :"
+uploadFilePath + "" + uploadFileName);
runOnUiThread(new Runnable()
{
public void run()
{
messageText.setText("Source File not exist :" +uploadFilePath + "" + uploadFileName);
}
});
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");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("uploaded_file", fileName);
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();
Log.i("uploadFile", "HTTP Response is : "
+ serverResponseMessage + ": " + serverResponseCode);
if(serverResponseCode == 200)
{
runOnUiThread(new Runnable()
{
public void run()
{
String msg = "File Upload Completed.\n\n See uploaded file here : \n\n"+" serverpath"
+uploadFileName;
messageText.setText(msg);
Toast.makeText(UploadToServer.this, "File Upload Complete.",
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 ");
Toast.makeText(UploadToServer.this, "Got Exception : see logcat ",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server Exception", "Exception : "
+ e.getMessage(), e);
}
dialog.dismiss();
return serverResponseCode;
}
}
}
因此我成功上传了该文件。现在我希望我的文件在特定的时间间隔内自动上传到服务器上。为此，我用Google搜索并找到了处理程序和计时器，但我仍然无法找到如何实现这一点。我想每隔1小时在服务器上上传我的文件。任何人都可以帮助我如何实现这一点，因为我是一个新手。提前谢谢。
答案 0 :(得分：0)
这对我有用：此代码在UI中运行
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask doAsynchronousTask = new TimerTask() {
@Override
public void run() {
handler.post(new Runnable() {
public void run() {
try {
// call ur AsyncTask
} catch (Exception e) {
// TODO Auto-generated catch block
}
}
});
}
};
timer.schedule(doAsynchronousTask, 0, 50000); //execute in every 50000 ms
}
答案 1 :(得分：0)
下面是启动计划任务的方法。 refreshTime以毫秒为单位，因此将1小时转换为millisecons。首先在onCreate或你需要的地方调用这个方法，然后自动调用方法（带处理程序）。
public Timer tvShowsRefreshTimer = new Timer();
private void launchScheduledTask(int refreshTime) {
tvShowsRefreshTimer.schedule(new TimerTask() {
@Override
public void run() {
myScheduledTask(refreshHandler);
}
}, refreshTime);
}
您需要的处理程序可以自动完成所有工作：
public Handler refreshHandler= new Handler() {
@Override
public void handleMessage(Message msg) {
launchScheduledTask(3600000); //task after 1 hour
super.handleMessage(msg);
}
};
在工作完成后不要忘记发布处理程序消息。此代码（如下）是从myScheduledTask方法调用的：
handler.sendEmptyMessage(1);
这就是你所需要的一切。将您的代码放入myScheduledTask方法并完成您的工作：）