我想从Android应用上传文件到服务器。我尝试这个但仍无法将文件上传到服务器。我的java中有一个错误。
public class UploadFileActivity extends AppCompatActivity implements View.OnClickListener{
private static final int PICK_FILE_REQUEST = 1;
private static final String TAG = MainActivity.class.getSimpleName();
private String selectedFilePath;
private String SERVER_URL = "http://url.com/mobile/json/upload_file.php";
ImageView ivAttachment;
Button bUpload;
TextView tvFileName;
ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_upload_file);
ivAttachment = (ImageView) findViewById(R.id.ivAttachment);
bUpload = (Button) findViewById(R.id.b_upload);
tvFileName = (TextView) findViewById(R.id.tv_file_name);
ivAttachment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showFileChooser();
}
});
bUpload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(selectedFilePath != null){
dialog = ProgressDialog.show(UploadFileActivity.this,"","Uploading File...",true);
new Thread(new Runnable() {
@Override
public void run() {
uploadFile(selectedFilePath);
}
}).start();
}else{
Toast.makeText(UploadFileActivity.this,"Please choose a File First",Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public void onClick(View v) {
}
private void showFileChooser() {
Intent intent = new Intent();
intent.setType("*/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,"Choose File to Upload.."),PICK_FILE_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == Activity.RESULT_OK){
if(requestCode == PICK_FILE_REQUEST){
if(data == null){
//no data present
return;
}
Uri selectedFileUri = data.getData();
if(Build.VERSION.SDK_INT >= 19) {
selectedFilePath = FilePath.getPath(this, selectedFileUri);
} else {
selectedFilePath = FilePath.getSmartFilePath(this, selectedFileUri);
}
Log.i(TAG,"Selected File Path:" + selectedFilePath);
if(selectedFilePath != null && !selectedFilePath.equals("")){
tvFileName.setText(selectedFilePath);
}else{
Toast.makeText(this,"Cannot upload file to server",Toast.LENGTH_SHORT).show();
}
}
}
}
public int uploadFile(final String selectedFilePath){
int serverResponseCode = 0;
HttpURLConnection connection;
DataOutputStream dataOutputStream;
String lineEnd = "\r\n";
String twoHyphens = "--";
final String boundary = "*****";
int bytesRead,bytesAvailable,bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File selectedFile = new File(selectedFilePath);
String[] parts = selectedFilePath.split("/");
String fileName = parts[parts.length-1];
String[] separate = fileName.split(Pattern.quote("."));
final String fileNameDoang = separate[0];
final String fileType = separate[1];
if (!selectedFile.isFile()){
dialog.dismiss();
runOnUiThread(new Runnable() {
@Override
public void run() {
tvFileName.setText("Source File Doesn't Exist: " + selectedFilePath);
}
});
return 0;
}else{
try{
FileInputStream fileInputStream = new FileInputStream(selectedFile);
URL url = new URL(SERVER_URL);
connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);//Allow Inputs
connection.setDoOutput(true);//Allow Outputs
connection.setUseCaches(false);//Don't use a cached Copy
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("ENCTYPE", "multipart/form-data");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
connection.setRequestProperty("uploaded_file",selectedFilePath);
int sizeFile = connection.getContentLength();
dataOutputStream = new DataOutputStream(connection.getOutputStream());
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ selectedFilePath + "\"" + lineEnd);
dataOutputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable,maxBufferSize);
buffer = new byte[bufferSize];
bytesRead = fileInputStream.read(buffer,0,bufferSize);
while (bytesRead > 0){
//write the bytes read from inputstream
dataOutputStream.write(buffer,0,bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable,maxBufferSize);
bytesRead = fileInputStream.read(buffer,0,bufferSize);
}
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
Log.i(TAG, "Server Response is: " + serverResponseMessage + ": " + serverResponseCode);
if(serverResponseCode == 200){
runOnUiThread(new Runnable() {
@Override
public void run() {
tvFileName.setText("File Upload completed.\n\n File Name : \n\n" + fileNameDoang + "File Type" + fileType);
}
});
}
fileInputStream.close();
dataOutputStream.flush();
dataOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(UploadFileActivity.this,"File Not Found",Toast.LENGTH_SHORT).show();
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
Toast.makeText(UploadFileActivity.this, "URL error!", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(UploadFileActivity.this, "Cannot Read/Write File!", Toast.LENGTH_SHORT).show();
}
dialog.dismiss();
return serverResponseCode;
}
}
}
获取我放入另一个java的文件路径。这是警告和错误：
09-30 20:44:50.766 9855-10872/com.sintask.android W/System.err: java.net.ProtocolException: cannot write request body after response has been read
09-30 20:44:50.766 9855-10872/com.sintask.android W/System.err: at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:223)
09-30 20:44:50.766 9855-10872/com.sintask.android W/System.err: at com.sintask.android.ui.UploadFileActivity.uploadFile(UploadFileActivity.java:195)
09-30 20:44:50.766 9855-10872/com.sintask.android W/System.err: at com.sintask.android.ui.UploadFileActivity$2$1.run(UploadFileActivity.java:66)
09-30 20:44:50.766 9855-10872/com.sintask.android W/System.err: at java.lang.Thread.run(Thread.java:818)
09-30 20:44:50.766 9855-10872/com.sintask.android E/AndroidRuntime: FATAL EXCEPTION: Thread-5234
Process: com.sintask.android, PID: 9855
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
答案 0 :(得分：1)
这是因为您在获取输出流之前调用了getContentLength()。没有任何意义。您正在上传，而不是下载。您不需要内容长度，或者在您上传文件之前不需要它。
NB available()不是确定文件或任何输入流长度的正确方法。使用File.length()。