android - 如何在android中使用发送数据

Question

如何从 Android 将图像发布到服务器

• 谁能解释一下实现这一目标的过程是什么
• 让新手理解的循序渐进
• 我只想发送一张图片

任何可以引用学习该主题的好链接，例如博客或教程

---

我做了什么

我已经引用了这个link

MainActivity.java

public class MainActivity extends Activity {

    Button submit, uplodbtn;
    EditText name, City;
    ProgressDialog pDialog;
    ImageView iv;
    private Bitmap bitmap;

    private static final int PICK_IMAGE = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        submit = (Button) findViewById(R.id.SUBMIT_BUTTON_ID);
        name = (EditText) findViewById(R.id.NAME_EDIT_TEXT_ID);
        City = (EditText) findViewById(R.id.CITY_EDIT_TEXT_ID);
        iv = (ImageView) findViewById(R.id.imageView1);
        uplodbtn = (Button) findViewById(R.id.button1);

        submit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                new MainTest().execute();

                // }
            }
        });

        iv.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                selectImageFromGallery();
            }
        });

        uplodbtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                new ImageUploadTask().execute();

            }
        });
    }

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

        if (requestCode == PICK_IMAGE && resultCode == RESULT_OK
                && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            decodeFile(picturePath);

        }
    }

    public void decodeFile(String filePath) {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, o);

        // The new size we want to scale to
        final int REQUIRED_SIZE = 1024;

        // Find the correct scale value. It should be the power of 2.
        int width_tmp = o.outWidth, height_tmp = o.outHeight;
        int scale = 1;
        while (true) {
            if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE)
                break;
            width_tmp /= 2;
            height_tmp /= 2;
            scale *= 2;
        }

        // Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        bitmap = BitmapFactory.decodeFile(filePath, o2);

        iv.setImageBitmap(bitmap);
    }

    public void selectImageFromGallery() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"),
                PICK_IMAGE);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void postData() {
        // Create a new HttpClient and Post Header

        // You can use NameValuePair for add data to post server and yes you can
        // also append your desire data which you want to post server.

        // Like:
        // yourserver_url+"name="+name.getText().toString()+"city="+City.getText().toString()
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("Your Server URL");

        try {
            // Add your data
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("Name", name.getText()
                    .toString()));
            nameValuePairs.add(new BasicNameValuePair("city", City.getText()
                    .toString()));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);
            Log.v("Response", response.toString());

        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
        } catch (IOException e) {
            // TODO Auto-generated catch block
        }
    }

    public class MainTest extends AsyncTask<String, Integer, String> {

        @Override
        protected void onPreExecute() {
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Loading..");
            pDialog.setIndeterminate(true);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        @Override
        protected String doInBackground(String... params) {

            postData();

            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // TODO Auto-generated method stub

            super.onPostExecute(result);
            // data=jobj.toString();
            pDialog.dismiss();

        }

    }

    class ImageUploadTask extends AsyncTask<Void, Void, String> {
        private String webAddressToPost = "http://your-website-here.com";

        // private ProgressDialog dialog;
        private ProgressDialog dialog = new ProgressDialog(MainActivity.this);

        @Override
        protected void onPreExecute() {
            dialog.setMessage("Uploading...");
            dialog.show();
        }

        @Override
        protected String doInBackground(Void... params) {
            try {
                HttpClient httpClient = new DefaultHttpClient();
                HttpContext localContext = new BasicHttpContext();
                HttpPost httpPost = new HttpPost(webAddressToPost);

                MultipartEntity entity = new MultipartEntity(
                        HttpMultipartMode.BROWSER_COMPATIBLE);

                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                bitmap.compress(CompressFormat.JPEG, 100, bos);
                byte[] data = bos.toByteArray();
                String file = Base64.encodeToString(data, 0);
                entity.addPart("uploaded", new StringBody(file));

                entity.addPart("someOtherStringToSend", new StringBody(
                        "your string here"));

                httpPost.setEntity(entity);
                HttpResponse response = httpClient.execute(httpPost,
                        localContext);
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(
                                response.getEntity().getContent(), "UTF-8"));

                String sResponse = reader.readLine();
                return sResponse;
            } catch (Exception e) {
                // something went wrong. connection with the server error
            }
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            dialog.dismiss();
            Toast.makeText(getApplicationContext(), "file uploaded",
                    Toast.LENGTH_LONG).show();
        }

    }

}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="24dp"
        android:layout_marginTop="32dp"
        android:clickable="false"
        android:src="@drawable/ic_launcher" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignTop="@+id/imageView1"
        android:text="Click to upload Image"
        android:textSize="15dp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/NAME_EDIT_TEXT_ID"
        android:layout_alignParentLeft="true"
        android:clickable="false"
        android:text="NAME"
        android:textSize="20dp"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/NAME_EDIT_TEXT_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/CITY_EDIT_TEXT_ID"
        android:layout_alignRight="@+id/button1"
        android:layout_marginBottom="30dp"
        android:ems="10" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/CITY_EDIT_TEXT_ID"
        android:layout_alignLeft="@+id/textView2"
        android:clickable="false"
        android:text="CITY"
        android:textSize="20dp"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/CITY_EDIT_TEXT_ID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/NAME_EDIT_TEXT_ID"
        android:layout_centerVertical="true"
        android:ems="10" />

    <Button
        android:id="@+id/SUBMIT_BUTTON_ID"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView2"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="47dp"
        android:text="SUBMIT" />

</RelativeLayout>

---

我还有博客中提到的 Base64.java 类

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我遇到的错误::

entity.addPart("uploaded", new StringBody(file));

entity.addPart("someOtherStringToSend", new StringBody("your string here"));

字符串正文无法解析为类型

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MultipartEntity entity = new MultipartEntity( HttpMultipartMode.BROWSER_COMPATIBLE);

无法将多部分实体解析为类型

---

Description Resource    Path    Location    Type
Project 'DataPostingProject' is missing required library: 'C:\Users\admin\Downloads\httpmime-4.1-beta1.jar\httpmime-4.1-beta1.jar'  DataPostingProject      Build path  Build Path Problem

我该如何纠正自己

Answer 1

这是因为您缺少 Multipart Entity Jar 文件.....

将httpmime 4.0.1 jar 文件添加到您的项目中......

将此文件添加到您的项目中......

右键单击项目 -> 属性 -> Android Java 构建路径 ->添加外部 Jar -> 选择jar文件路径后 -> 终于OK了