我是 Android 编程的新手，我的任务是将图像和文本数据发送到 Web 服务器(本地主机)，但是我已经尝试了很多代码来完成这项工作

所有这些都不起作用。每当我尝试执行代码时，我的应用程序就会崩溃，因此我决定调试代码并查看问题所在。然后我发现

每当找到 MultipartEntity 时，代码就会崩溃。我真的不知道为什么。

代码是这样的

Log.v(TAG, "(1)");
HttpClient httpClient;
HttpPost postRequest;
Log.v(TAG, "(2)" + picturePath);
MultipartEntity reqEntity;
ResponseHandler<String> responseHandler;
Log.v(TAG, "(3)");
File file;
FileBody fileBody;
Log.v(TAG, "(4)");
httpClient = new DefaultHttpClient();
postRequest = new HttpPost("http://192.168.5.132/mysite/test.php");
responseHandler = new BasicResponseHandler();
Log.v(TAG, "(5)");
    // Indicate that this information comes in parts (text and file)
reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
Log.v(TAG, "(6)");
file = new File(picturePath);
fileBody = new FileBody(file, "images/jpeg");
reqEntity.addPart("fileupload", fileBody);
Log.v(TAG, "(7)");
try {
      reqEntity.addPart("username", new StringBody("un"));
      reqEntity.addPart("password", new StringBody("pw"));

      postRequest.setEntity(reqEntity);
      httpClient.execute(postRequest, responseHandler);
    }
catch (UnsupportedEncodingException e) {
      e.printStackTrace();
}
catch (ClientProtocolException e) {
      e.printStackTrace();
}
catch (IOException e) {
      e.printStackTrace();
}

我已将日志包含到代码中，以查看代码在执行期间停止的位置。这是日志 cat 输出!

08-27 12:22:47.153: V/(10358): (1)

08-27 12:22:47.153: V/(10358): (2)/storage/sdcard0/Pictures/boarding_pass.bmp

08-27 12:22:47.153: V/(10358): (3)

08-27 12:22:47.153: V/(10358): (4)

08-27 12:22:47.153: V/(10358): (5)

08-27 12:22:47.153: D/AndroidRuntime(10358): Shutting down VM

08-27 12:22:47.153: W/dalvikvm(10358): threadid=1: thread exiting with uncaught exception 
(group=0x417da2a0)

08-27 12:22:47.163: E/AndroidRuntime(10358): FATAL EXCEPTION: main

08-27 12:22:47.163: E/AndroidRuntime(10358): java.lang.IllegalStateException: Could not execute 
method of the activity


08-27 12:22:47.163: E/AndroidRuntime(10358):    at android.view.View$1.onClick(View.java:3614)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at android.view.View.performClick(View.java:4107)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at 
android.view.View$PerformClick.run(View.java:17056)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at android.os.Handler.handleCallback(Handler.java:615)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at android.os.Handler.dispatchMessage(Handler.java:92)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at android.os.Looper.loop(Looper.java:137)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at 
android.app.ActivityThread.main(ActivityThread.java:4830)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at java.lang.reflect.Method.invokeNative(Native Method)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at java.lang.reflect.Method.invoke(Method.java:511)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)

08-27 12:22:47.163: E/AndroidRuntime(10358):    at dalvik.system.NativeStart.main(Native Method)

08-27 12:22:47.163: E/AndroidRuntime(10358): Caused by: java.lang.reflect.InvocationTargetException

08-27 12:22:47.163: E/AndroidRuntime(10358):    at java.lang.reflect.Method.invokeNative(Native 
Method)
......

真的需要你的帮助..非常感谢..

最佳答案

尝试此代码 100% 有效。通过多部分数据传递完成图片上传

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.fileupload.MainActivity"
    tools:ignore="MergeRootFrame" >

    <ImageView
        android:id="@+id/imageView_pic"
        android:layout_width="100dp"
        android:layout_height="150dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:src="@drawable/abc_ab_bottom_solid_light_holo" />

    <Button
        android:id="@+id/button_selectpic"
        android:layout_width="250dp"
        android:layout_height="50dp"
        android:layout_below="@+id/imageView_pic"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="18dp"
        android:text="Browse" />

    <Button
        android:id="@+id/uploadButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button_selectpic"
        android:layout_alignRight="@+id/button_selectpic"
        android:layout_below="@+id/button_selectpic"
        android:text="upload" />

    <TextView
        android:id="@+id/messageText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/uploadButton"
        android:layout_alignRight="@+id/uploadButton"
        android:layout_below="@+id/uploadButton"
        android:layout_marginTop="38dp"
        android:text=""
        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

安卓代码

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

    private TextView messageText;
    private Button uploadButton, btnselectpic;
    private ImageView imageview;
    private int serverResponseCode = 0;
    private ProgressDialog dialog = null;

    private String upLoadServerUri = null;
    private String imagepath=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        uploadButton = (Button)findViewById(R.id.uploadButton);
        messageText  = (TextView)findViewById(R.id.messageText);
        btnselectpic = (Button)findViewById(R.id.button_selectpic);
        imageview = (ImageView)findViewById(R.id.imageView_pic);

        btnselectpic.setOnClickListener(this);
        uploadButton.setOnClickListener(this);
        upLoadServerUri = "http://192.168.2.4/fileupload/upljson.php";
    }


    @Override
    public void onClick(View arg0) {
        if(arg0==btnselectpic)
        {
            Intent intent = new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(intent, "Complete action using"), 1);
        }
        else if (arg0==uploadButton) {

             dialog = ProgressDialog.show(MainActivity.this, "", "Uploading file...", true);
             messageText.setText("uploading started.....");
             new Thread(new Runnable() {
                 public void run() {

                      uploadFile(imagepath);

                 }
               }).start();     
        }

    } 

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == 1 && resultCode == RESULT_OK) {
            //Bitmap photo = (Bitmap) data.getData().getPath(); 

            Uri selectedImageUri = data.getData();
            imagepath = getPath(selectedImageUri);
            Bitmap bitmap=BitmapFactory.decodeFile(imagepath);
            imageview.setImageBitmap(bitmap);
            messageText.setText("Uploading file path:" +imagepath);

        }
    }
         public String getPath(Uri uri) {
                String[] projection = { MediaStore.Images.Media.DATA };
                Cursor cursor = managedQuery(uri, projection, null, null, null);
                int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                cursor.moveToFirst();
                return cursor.getString(column_index);
            }

    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 :"+imagepath);

               runOnUiThread(new Runnable() {
                   public void run() {
                       messageText.setText("Source File not exist :"+ imagepath);
                   }
               }); 

               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("file", fileName); 

                   dos = new DataOutputStream(conn.getOutputStream());

                   dos.writeBytes(twoHyphens + boundary + lineEnd); 
                   dos.writeBytes("Content-Disposition: form-data; name=\"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"
                                      +" C:/xamp/wamp/fileupload/uploads";
                                messageText.setText(msg);
                                Toast.makeText(MainActivity.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(MainActivity.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(MainActivity.this, "Got Exception : see logcat ", Toast.LENGTH_SHORT).show();
                      }
                  });
                  Log.e("Upload file to server Exception", "Exception : "  + e.getMessage(), e);  
              }
              dialog.dismiss();       
              return serverResponseCode; 

           } // End else block 
         }


}

php服务器代码

<?php
 $response = array();
if (empty($_FILES) || $_FILES['file']['error']) {
 $response["code"] = 2;
        $response["message"] = "failed to move uploaded file";
        echo json_encode($response);
 }

$chunk = isset($_REQUEST["chunk"]) ? intval($_REQUEST["chunk"]) : 0;
$chunks = isset($_REQUEST["chunks"]) ? intval($_REQUEST["chunks"]) : 0;

$fileName = isset($_REQUEST["name"]) ? $_REQUEST["name"] : $_FILES["file"]["name"];
$filePath = "uploads/$fileName";


// Open temp file
$out = @fopen("{$filePath}.part", $chunk == 0 ? "wb" : "ab");

if ($out) {
  // Read binary input stream and append it to temp file
  $in = @fopen($_FILES['file']['tmp_name'], "rb");

  if ($in) {
    while ($buff = fread($in, 4096))
          fwrite($out, $buff);

  } else

 $response["code"] = 2;
 $response["message"] = "Oops!  Failed to open input Stream error occurred.";
 echo json_encode($response);
  @fclose($in);

  @fclose($out);

  @unlink($_FILES['file']['tmp_name']);
} else

   $response["code"] = 2;
        $response["message"] = "Oops! Failed to open output error occurred.";
        echo json_encode($response);


// Check if file has been uploaded
if (!$chunks || $chunk == $chunks - 1) {
  // Strip the temp .part suffix off
  rename("{$filePath}.part", $filePath);
}
  $response["code"] = 2;
        $response["message"] = "successfully uploaded";
        echo json_encode($response);

?>

以上代码 100% 有效。 如果你想要多部分实体传递，在你的程序必要的地方试试这个代码，并且代码添加 $_post 方法，例如($name=$_POST['username'];)在你的 php 服务器上

entity.addPart("user_id", new StringBody(user_id));
            Log.d("userid",user_id);
            entity.addPart("username", new StringBody(username));
            entity.addPart("password", new StringBody(password));
            entity.addPart("filetype",new StringBody("jpeg"));
            // entity.addPart("photo", new
            // StringBody("/storage/sdcard0/Download/1.jpg"));
            httpPost.setEntity(entity);

            Log.d("URL Request: ", url.toString());

            HttpResponse httpResponse = httpClient.execute(httpPost);
            int code = httpResponse.getStatusLine().getStatusCode(); 

将所需的值传递给此函数并在 php 上添加 $_post["username"],$_post["password"]

public JSONObject getJSONFromUrl(String url, String username,
            String password,  String photo_path) {
InputStream is = null;
    JSONObject jObj = null;
    static String jsonResp = "";
    String CONTENT_TYPE_JSON = "application/json";
    static String json = "";
    Context context;

        try {
            File file = null;
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            MultipartEntity entity = new MultipartEntity(
                    HttpMultipartMode.BROWSER_COMPATIBLE);

            if(photo_path != null)
                file = new File(photo_path);

            //temp end
            entity.addPart("username", new StringBody(username));
            entity.addPart("password", new StringBody(password));

            entity.addPart("file", new FileBody(file));
            entity.addPart("filetype",new StringBody("jpeg"));
            // entity.addPart("photo", new
            // StringBody("/storage/sdcard0/Download/1.jpg"));
            httpPost.setEntity(entity);

            Log.d("URL Request: ", url.toString());

            HttpResponse httpResponse = httpClient.execute(httpPost);
            int code = httpResponse.getStatusLine().getStatusCode();

            if (code != 200) {
                Log.d("HTTP response code is:", Integer.toString(code));
                return null;
            } else {
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
            }
        } catch (ConnectTimeoutException e) {
            // TODO: handle exception

            Log.e("Timeout Exception", e.toString());
            return null;
        } catch (SocketTimeoutException e) {
            // TODO: handle exception
            Log.e("Socket Time out", e.toString());
            return null;
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return null;
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

        try {

            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            jsonResp = sb.toString();

            Log.d("Content: ", sb.toString());

        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting Response " + e.toString());
            return null;
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(jsonResp);

        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON Object
        return jObj;
    }

关于java - 将图像/文本文件从 Android 发送到 Web 服务器(本地主机)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25518963/