我将图像从android studio发送到wcf服务两个代码都是正确的，当我点击sendToServer按钮时，应用程序崩溃了。我不知道我的代码有什么问题。 这是MainActivity.java的代码
public class MainActivity extends AppCompatActivity
{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
StrictMode.ThreadPolicy policy = new
StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
private static final int CAMERA_REQUEST = 1888;
private int PICK_IMAGE_REQUEST = 1;
public PlaceholderFragment() {
}
private final static String SERVICE_URI = "http://localhost:24895/WcfAndroidImageService/WcfAndroidImageService.svc";
ImageView imageView = null;
byte[] photoasbytearray = null;
Photo ph = null;
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(photo);
//getting photo as byte array
ByteArrayOutputStream stream = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100,stream);
photoasbytearray = stream.toByteArray();
//give a name of the image here as date
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HHmm");
String currentDateandTime = sdf.format(new Date());
ph = new Photo();
String encodedImage = Base64.encodeToString(photoasbytearray,Base64.DEFAULT);
ph.photoasBase64=encodedImage;
ph.photoName= currentDateandTime+".png";
}
}
private void SendToServer(Photo ph2) throws UnsupportedEncodingException {
// TODO Auto-generated method stub
HttpPost httpPost = new HttpPost(SERVICE_URI+"LoadPhoto");
httpPost.setHeader("Content-Type", "application/json; charset=UTF-8");
HttpClient httpClient = new DefaultHttpClient(getHttpParameterObj(17000,17000));
// Building the JSON object.
com.google.gson.Gson gson = new GsonBuilder().disableHtmlEscaping().create();
String json = gson.toJson(ph2);
StringEntity entity = new StringEntity(json,"UTF_8");
Log.d("WebInvoke", "data : " + json);
httpPost.setEntity(entity);
// Making the call.
HttpResponse response = null;
try
{
response = httpClient.execute(httpPost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
Log.d("Exception",e.toString());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Getting data from the response to see if it was a success.
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()
));
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d("IO_Exception",e.toString());
}
String jsonResultStr = null;
try {
jsonResultStr = reader.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d("WebInvoke", "donnen deger : " + jsonResultStr);
}
private HttpParams getHttpParameterObj(int timeOutConnection, int timeOutSocket)
{
HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds until a connection is established.
HttpConnectionParams.setConnectionTimeout(httpParameters, timeOutConnection);
// Set the default socket timeout (SO_TIMEOUT)
// in milliseconds which is the timeout for waiting for data.
HttpConnectionParams.setSoTimeout(httpParameters, timeOutSocket);
return httpParameters;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_photo, container,
false);
imageView = (ImageView)rootView.findViewById(R.id.imageView1);
Button btnOpenCam = (Button) rootView.findViewById(R.id.btnOpenCam);
Button btnSendServer = (Button) rootView.findViewById(R.id.btnSendServer);
Button btnOpenImage = (Button)rootView.findViewById(R.id.openImage);
btnOpenCam.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Start camera activity here
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
});
btnOpenImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
// Show only images, no videos or anything else
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
// Always show the chooser (if there are multiple options available)
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}
});
btnSendServer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
try {
SendToServer(ph);
// Toast.makeText(getActivity(),"Image Sent to Server!", Toast.LENGTH_SHORT).show();
//Toast.makeText(getActivity(),"Server got the image!", Toast.LENGTH_SHORT).show();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
return rootView;
}
}
}
这是Photo.java
package com.example.haier.leafclassification;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class Photo {
public String photoasBase64;
public String photoName ;
}
在服务器端，这里是IWcfAndroidImageService.cs文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WcfAndroidPhotoServis
{
[ServiceContract]
public interface IWcfAndroidImageService
{
[OperationContract]
[WebInvoke(Method = "POST",
RequestFormat = WebMessageFormat.Json,
ResponseFormat = WebMessageFormat.Json,
// BodyStyle = WebMessageBodyStyle.Wrapped,
UriTemplate = "LoadPhoto")]
string LoadPhoto(Photo photo);
}
}
这是WcfAndroidImageService.svc文件代码
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using WcfAndroidPhotoServis.Helper;
namespace WcfAndroidPhotoServis
{
public class WcfAndroidImageService : IWcfAndroidImageService
{
public string LoadPhoto(Photo photo)
{
//get photofolder path
string photofolderName = "LoadedPhotos";
string photopath = "";
photopath = System.Web.Hosting.HostingEnvironment.MapPath("~/"+photofolderName);
//convert byte array to image
Image _photo = ImageHelper.Base64ToImage(photo.photoasBase64);
photopath = photopath + "/" + photo.photoName;
//save photo to folder
_photo.Save(photopath);
//chech if photo saved correctlly into folder
bool result = File.Exists(photopath);
// string result = "Server got the image!";
return result.ToString();
}
}
[DataContract]
public class Photo
{
//device id
[DataMember]
public string photoasBase64 { get; set; }
[DataMember]
public string photoName { get; set; }
}
}
这是我在主要活动日志中收到的消息
W / System.err：org.apache.http.conn.HttpHostConnectException：拒绝与http://localhost:24895的连接
以下是主要活动日志显示的三个行号
java.lang.NullPointerException: Attempt to invoke interface method 'org.apache.http.HttpEntity org.apache.http.HttpResponse.getEntity()' on a null object reference
at com.example.haier.leafclassification.MainActivity$PlaceholderFragment.SendToServer(MainActivity.java:378)
at com.example.haier.leafclassification.MainActivity$PlaceholderFragment.access$100(MainActivity.java:293)
at com.example.haier.leafclassification.MainActivity$PlaceholderFragment$3.onClick(MainActivity.java:463)
并且这些行具有以下代码
Line 378: reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()
Line 293: public static class PlaceholderFragment extends Fragment {
Line 463: SendToServer(ph);