我正在尝试使用 Asynctask 将文件上传到 PHP 服务器，但由于出现错误而无法上传。这是日志：
04-03 00:52:16.065: I/Process(11648): Sending signal. PID: 11648 SIG: 9
04-03 00:52:28.955: I/URL FORMATION(11752): MALFORMATED URL
04-03 00:52:28.955: E/3rd(11752): Starting to bad things
04-03 00:52:28.963: W/dalvikvm(11752): threadid=11: thread exiting with uncaught exception (group=0x4195f2a0)
04-03 00:52:28.963: E/AndroidRuntime(11752): FATAL EXCEPTION: AsyncTask #1
04-03 00:52:28.963: E/AndroidRuntime(11752): java.lang.RuntimeException: An error occured while executing
doInBackground()
04-03 00:52:28.963: E/AndroidRuntime(11752): at android.os.AsyncTask$3.done(AsyncTask.java:299)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.util.concurrent.FutureTask$Sync.innerSetException
(FutureTask.java:273)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
04-03 00:52:28.963: E/AndroidRuntime(11752): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.util.concurrent.ThreadPoolExecutor.runWorker
(ThreadPoolExecutor.java:1076)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.util.concurrent.ThreadPoolExecutor$Worker.run
(ThreadPoolExecutor.java:569)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.lang.Thread.run(Thread.java:856)
04-03 00:52:28.963: E/AndroidRuntime(11752): Caused by: java.lang.NullPointerException
04-03 00:52:28.963: E/AndroidRuntime(11752): at com.example.up.HttpFileUploader.thirdTry(HttpFileUploader.java:54)
04-03 00:52:28.963: E/AndroidRuntime(11752): at com.example.up.HttpFileUploader.doStart(HttpFileUploader.java:36)
04-03 00:52:28.963: E/AndroidRuntime(11752): at com.example.up.MainActivity.uploadFile(MainActivity.java:59)
04-03 00:52:28.963: E/AndroidRuntime(11752): at com.example.up.MainActivity$myasynctask.doInBackground
(MainActivity.java:38)
04-03 00:52:28.963: E/AndroidRuntime(11752): at com.example.up.MainActivity$myasynctask.doInBackground
(MainActivity.java:1)
04-03 00:52:28.963: E/AndroidRuntime(11752): at android.os.AsyncTask$2.call(AsyncTask.java:287)
04-03 00:52:28.963: E/AndroidRuntime(11752): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
04-03 00:52:28.963: E/AndroidRuntime(11752): ... 5 more
04-03 00:52:29.182: D/libEGL(11752): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so
04-03 00:52:29.182: D/libEGL(11752): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so
04-03 00:52:29.190: D/libEGL(11752): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
04-03 00:52:29.284: D/OpenGLRenderer(11752): Enabling debug mode 0
04-03 00:52:35.518: I/Choreographer(11752): Skipped 375 frames! The application may be doing too much work on its main
thread.
04-03 00:52:35.768: E/WindowManager(11752): Activity com.example.up.MainActivity has leaked window
com.android.internal.policy.impl.PhoneWindow$DecorView@42138c08 that was originally added here
04-03 00:52:35.768: E/WindowManager(11752): android.view.WindowLeaked: Activity com.example.up.MainActivity has leaked
window com.android.internal.policy.impl.PhoneWindow$DecorView@42138c08 that was originally added here
04-03 00:52:35.768: E/WindowManager(11752): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:397)
04-03 00:52:35.768: E/WindowManager(11752): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:311)
04-03 00:52:35.768: E/WindowManager(11752): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224)
04-03 00:52:35.768: E/WindowManager(11752): at android.view.WindowManagerImpl$CompatModeWrapper.addView
(WindowManagerImpl.java:149)
04-03 00:52:35.768: E/WindowManager(11752): at android.view.Window$LocalWindowManager.addView(Window.java:556)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.Dialog.show(Dialog.java:277)
04-03 00:52:35.768: E/WindowManager(11752): at com.example.up.MainActivity$myasynctask.onPreExecute
(MainActivity.java:32)
04-03 00:52:35.768: E/WindowManager(11752): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
04-03 00:52:35.768: E/WindowManager(11752): at android.os.AsyncTask.execute(AsyncTask.java:534)
04-03 00:52:35.768: E/WindowManager(11752): at com.example.up.MainActivity.onCreate(MainActivity.java:20)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.Activity.performCreate(Activity.java:5163)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.Instrumentation.callActivityOnCreate
(Instrumentation.java:1094)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.ActivityThread.performLaunchActivity
(ActivityThread.java:2061)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.ActivityThread.handleLaunchActivity
(ActivityThread.java:2122)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.ActivityThread.access$600(ActivityThread.java:140)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1228)
04-03 00:52:35.768: E/WindowManager(11752): at android.os.Handler.dispatchMessage(Handler.java:99)
04-03 00:52:35.768: E/WindowManager(11752): at android.os.Looper.loop(Looper.java:137)
04-03 00:52:35.768: E/WindowManager(11752): at android.app.ActivityThread.main(ActivityThread.java:4895)
04-03 00:52:35.768: E/WindowManager(11752): at java.lang.reflect.Method.invokeNative(Native Method)
04-03 00:52:35.768: E/WindowManager(11752): at java.lang.reflect.Method.invoke(Method.java:511)
04-03 00:52:35.768: E/WindowManager(11752): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
(ZygoteInit.java:994)
04-03 00:52:35.768: E/WindowManager(11752): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
04-03 00:52:35.768: E/WindowManager(11752): at dalvik.system.NativeStart.main(Native Method)
为了上传文件，我有 2 个类：HTTPFileUploader：
public class HttpFileUploader implements Runnable{
URL connectURL;
String params;
String responseString;
//InterfaceHttpUtil ifPostBack;
String fileName;
byte[] dataToServer;
HttpFileUploader(String urlString, String params, String fileName ){
try{
connectURL = new URL(urlString);
}catch(Exception ex){
Log.i("URL FORMATION","MALFORMATED URL");
}
this.params = params+"=";
this.fileName = fileName;
}
void doStart(FileInputStream stream){
fileInputStream = stream;
thirdTry();
}
FileInputStream fileInputStream = null;
void thirdTry() {
String exsistingFileName = fileName;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
String Tag="3rd";
try
{
//------------------ CLIENT REQUEST
Log.e(Tag,"Starting to bad things");
// Open a HTTP connection to the URL
HttpURLConnection conn = (HttpURLConnection) connectURL.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
DataOutputStream dos = new DataOutputStream( conn.getOutputStream() );
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + exsistingFileName +"\"" + lineEnd);
dos.writeBytes(lineEnd);
Log.e(Tag,"Headers are written");
// create a buffer of maximum size
int bytesAvailable = fileInputStream.available();
int maxBufferSize = 1024;
int bufferSize = Math.min(bytesAvailable, maxBufferSize);
byte[] buffer = new byte[bufferSize];
// read file and write it into form...
int 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);
// close streams
Log.e(Tag,"File is written");
fileInputStream.close();
dos.flush();
InputStream is = conn.getInputStream();
// retrieve the response from server
int ch;
StringBuffer b =new StringBuffer();
while( ( ch = is.read() ) != -1 ){
b.append( (char)ch );
}
String s=b.toString();
Log.i("Response",s);
dos.close();
}
catch (MalformedURLException ex)
{
Log.e(Tag, "error: " + ex.getMessage(), ex);
}
catch (IOException ioe)
{
Log.e(Tag, "error: " + ioe.getMessage(), ioe);
}
}
@Override
public void run() {
}
}
MainActivity，其中 Asynctask 在开始时执行，应该从 sdcard 上传文件。
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new myasynctask().execute();
}
public class myasynctask extends AsyncTask<Void, Void, Void>{
private final ProgressDialog dialog = new ProgressDialog(
MainActivity.this);
protected void onPreExecute() {
this.dialog.setMessage("Loading...");
this.dialog.setCancelable(false);
this.dialog.show();
}
@Override
protected Void doInBackground(Void... params) {
File sdCard = Environment.getExternalStorageDirectory();
uploadFile(sdCard.getAbsolutePath() + "/PruebasEvaluacion/text.txt");
return null;
}
protected void onPostExecute(Void result) {
// Here if you wish to do future process for ex. move to another activity do here
if (dialog.isShowing()) {
dialog.dismiss();
}
}
}
public void uploadFile(String filename){
try {
//FileInputStream fis =this.openFileInput(filename);
FileInputStream fis = new FileInputStream(filename);
HttpFileUploader htfu = new HttpFileUploader("192.168.1.37/prueba/upload_file.php","noparamshere", filename);
htfu.doStart(fis);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
我希望一切都清楚，如果有不清楚的地方，我会回答一切。感谢您的时间和耐心。