我有文件上传到服务器的代码，其代码工作的个人，但这在我的应用程序中实现了它的goto异常
这是我的代码
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 :"
+ selectedFilePath);
runOnUiThread(new Runnable() {
public void run() {
// messageText.setText("Source File not exist :"
// + selectedFilePath);
}
});
return 0;
} else {
int serverResponseCode = 0;
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(uploadurl);
// 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("userfile", fileName);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"userfile\";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();
final String response;
Log.i("uploadFile", "HTTP Response is : "
+ serverResponseMessage + ": " + serverResponseCode + serverResponseMessage);
String data;
if (serverResponseCode == 200) {
final HttpURLConnection finalConn = conn;
runOnUiThread(new Runnable() {
public void run() {
/*String msg = "File Upload Completed.\n\n See uploaded file here : \n\n"
+" http://www.androidexample.com/media/uploads/"
+uploadFileName;*/
//messageText.setText(msg);
String data = null;
BufferedReader in = null;
try {
in = new BufferedReader(new
InputStreamReader(
finalConn.getInputStream()));
StringBuilder result = new StringBuilder();
String line;
while ((line = in.readLine()) != null) {
result.append(line);
data = result.toString();
break;
}
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(Individual_Message.this, "File Upload Complete." + data,
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(Individual_Message.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(Individual_Message.this, "Got Exception : see logcat ",
Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file", "Exception : "
+ e.getMessage(), e);
}
//dialog.dismiss();
return serverResponseCode;
}
}
单独运行获取确切结果但在我的应用内
获取日志猫
V/Selected File Path:: /storage/emulated/0/temporary_file_0.jpg
V/FA: Activity resumed, time: 268130823
V/FA: Inactivity, disconnecting from AppMeasurementService
W/System.err: android.os.NetworkOnMainThreadException
W/System.err: at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)
W/System.err: at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:249)
W/System.err: at libcore.io.IoBridge.recvfrom(IoBridge.java:549)
W/System.err: at java.net.PlainSocketImpl.read(PlainSocketImpl.java:481)
W/System.err: at java.net.PlainSocketImpl.- wrap0(PlainSocketImpl.java)
W/System.err: at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:237)
W/System.err: at com.android.okhttp.okio.Okio$2.read(Okio.java:135)
W/System.err: at com.android.okhttp.okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
W/System.err: at com.android.okhttp.okio.RealBufferedSource.exhausted(RealBufferedSource.java:60)
W/System.err: at com.android.okhttp.internal.http.HttpConnection.isReadable(HttpConnection.java:155)
W/System.err: at com.android.okhttp.Connection.isReadable(Connection.java:235)
W/System.err: at com.android.okhttp.OkHttpClient$1.isReadable(OkHttpClient.java:91)
W/System.err: at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:350)
W/System.err: at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340)
W/System.err: at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
W/System.err: at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute HttpURLConnectionImpl.java:437)
W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:245)
W/System.err: at technologies.codegreen.com.drzonesample.My_Messages.Individual_Message.uploadFile(Individual_Message.java:355)
W/System.err: at technologies.codegreen.com.drzonesample.My_Messages.Individual_Message$2.onClick(Individual_Message.java:148)
W/System.err: at android.view.View.performClick(View.java:5204)
W/System.err: at android.view.View$PerformClick.run(View.java:21153)
W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
W/System.err: at android.os.Looper.loop(Looper.java:148)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5480)
W/System.err: at java.lang.reflect.Method.invoke(Native Method)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
E/Upload file: Exception : null
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)
at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:249)
at libcore.io.IoBridge.recvfrom(IoBridge.java:549)
at java.net.PlainSocketImpl.read(PlainSocketImpl.java:481)
at java.net.PlainSocketImpl.-wrap0(PlainSocketImpl.java)
at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:237)
at com.android.okhttp.okio.Okio$2.read(Okio.java:135)
at com.android.okhttp.okio.AsyncTimeout$2.read(AsyncTimeout.java:211)
at com.android.okhttp.okio.RealBufferedSource.exhausted(RealBufferedSource.java:60)
at com.android.okhttp.internal.http.HttpConnection.isReadable(HttpConnection.java:155)
at com.android.okhttp.Connection.isReadable(Connection.java:235)
at com.android.okhttp.OkHttpClient$1.isReadable(OkHttpClient.java:91)
at com.android.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:350)
at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:340)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:330)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:437)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:114)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:245)
at technologies.codegreen.com.drzonesample.My_Messages.Individual_Message.uploadFile(Individual_Message.java:355)
at technologies.codegreen.com.drzonesample.My_Messages.Individual_Message$2.onClick(Individual_Message.java:148)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21153)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5480)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
答案 0 :(得分：0)
当您的应用程序尝试在其主线程上执行网络操作时，将引发NetworkOnMainThreadException。
使用AsyncTask并在其中运行代码
答案 1 :(得分：0)
To avoid the application not responding error, android avoids you to do any long operation in UI thread synchronously.
You have do to it in a separated thread asynchronously as follows.
Create a different class
private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
int count = urls.length;
long totalSize = 0;
for (int i = 0; i < count; i++) {
//write your code of file download.
publishProgress((int) ((i / (float) count) * 100));
// Escape early if cancel() is called
if (isCancelled()) break;
}
return totalSize;
}
protected void onProgressUpdate(Integer... progress) {
setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
showDialog("Downloaded " + result + " bytes");
}
}
and in upload file method just call this.
new DownloadFilesTask().execute(url1, url2, url3);
Theory https://developer.android.com/reference/android/os/AsyncTask.html