Android上传图片到服务器

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"       android:orientation="vertical"       android:layout_width="fill_parent"       android:layout_height="fill_parent"       >       <Button         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="选择图片"       android:id="@+id/selectImage"       />       <Button         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="上传图片"       android:id="@+id/uploadImage"       />        <ImageView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/imageView"       />   </LinearLayout>        public class Upload extends Activity implements OnClickListener {      private static String requestURL = "http://192.168.1.212:8011/pd/upload/fileUpload.do";      private Button selectImage, uploadImage;      private ImageView imageView;         private String picPath = null;         /** Called when the activity is first created. */      @Override      public void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.upload);             selectImage = (Button) this.findViewById(R.id.selectImage);          uploadImage = (Button) this.findViewById(R.id.uploadImage);          selectImage.setOnClickListener(this);          uploadImage.setOnClickListener(this);             imageView = (ImageView) this.findViewById(R.id.imageView);         }         @Override      public void onClick(View v) {          switch (v.getId()) {          case R.id.selectImage:              /***               * 这个是调用android内置的intent，来过滤图片文件 ，同时也可以过滤其他的               */              Intent intent = new Intent();              intent.setType("image/*");              intent.setAction(Intent.ACTION_GET_CONTENT);              startActivityForResult(intent, 1);              break;          case R.id.uploadImage:              if (picPath == null) {                     Toast.makeText(Upload.this, "请选择图片！", 1000).show();              } else {                  final File file = new File(picPath);                     if (file != null) {                      String request = UploadUtil.uploadFile(file, requestURL);                      uploadImage.setText(request);                  }              }              break;          default:              break;          }      }         @Override      protected void onActivityResult(int requestCode, int resultCode, Intent data) {          if (resultCode == Activity.RESULT_OK) {              /**               * 当选择的图片不为空的话，在获取到图片的途径               */              Uri uri = data.getData();              Log.e(TAG, "uri = " + uri);              try {                  String[] pojo = { MediaStore.Images.Media.DATA };                     Cursor cursor = managedQuery(uri, pojo, null, null, null);                  if (cursor != null) {                      ContentResolver cr = this.getContentResolver();                      int colunm_index = cursor                              .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);                      cursor.moveToFirst();                      String path = cursor.getString(colunm_index);                      /***                       * 这里加这样一个判断主要是为了第三方的软件选择，比如：使用第三方的文件管理器的话，你选择的文件就不一定是图片了，                       * 这样的话，我们判断文件的后缀名 如果是图片格式的话，那么才可以                       */                      if (path.endsWith("jpg") || path.endsWith("png")) {                          picPath = path;                          Bitmap bitmap = BitmapFactory.decodeStream(cr                                  .openInputStream(uri));                          imageView.setImageBitmap(bitmap);                      } else {                          alert();                      }                  } else {                      alert();                  }                 } catch (Exception e) {              }          }             super.onActivityResult(requestCode, resultCode, data);      }         private void alert() {          Dialog dialog = new AlertDialog.Builder(this).setTitle("提示")                  .setMessage("您选择的不是有效的图片")                  .setPositiveButton("确定", new DialogInterface.OnClickListener() {                      public void onClick(DialogInterface dialog, int which) {                          picPath = null;                      }                  }).create();          dialog.show();      }     }              public class UploadUtil {      private static final String TAG = "uploadFile";      private static final int TIME_OUT = 10 * 1000; // 超时时间      private static final String CHARSET = "utf-8"; // 设置编码      /**       * 上传文件到服务器       * @param file 需要上传的文件       * @param RequestURL 请求的rul       * @return 返回响应的内容       */      public static int uploadFile(File file, String RequestURL) {          int res=0;          String result = null;          String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成          String PREFIX = "--", LINE_END = "\r\n";          String CONTENT_TYPE = "multipart/form-data"; // 内容类型             try {              URL url = new URL(RequestURL);              HttpURLConnection conn = (HttpURLConnection) url.openConnection();              conn.setReadTimeout(TIME_OUT);              conn.setConnectTimeout(TIME_OUT);              conn.setDoInput(true); // 允许输入流              conn.setDoOutput(true); // 允许输出流              conn.setUseCaches(false); // 不允许使用缓存              conn.setRequestMethod("POST"); // 请求方式              conn.setRequestProperty("Charset", CHARSET); // 设置编码              conn.setRequestProperty("connection", "keep-alive");              conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary="+ BOUNDARY);                 if (file != null) {                  /**                   * 当文件不为空时执行上传                   */                  DataOutputStream dos = new DataOutputStream(conn.getOutputStream());                  StringBuffer sb = new StringBuffer();                  sb.append(PREFIX);                  sb.append(BOUNDARY);                  sb.append(LINE_END);                  /**                   * 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件                   * filename是文件的名字，包含后缀名                   */                     sb.append("Content-Disposition: form-data; name=\"file\"; filename=\""                          + file.getName() + "\"" + LINE_END);                  sb.append("Content-Type: application/octet-stream; charset="                          + CHARSET + LINE_END);                  sb.append(LINE_END);                  dos.write(sb.toString().getBytes());                  InputStream is = new FileInputStream(file);                  byte[] bytes = new byte[1024];                  int len = 0;                  while ((len = is.read(bytes)) != -1) {                      dos.write(bytes, 0, len);                  }                  is.close();                  dos.write(LINE_END.getBytes());                  byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END)                          .getBytes();                  dos.write(end_data);                  dos.flush();                  /**                   * 获取响应码 200=成功 当响应成功，获取响应的流                   */                   res = conn.getResponseCode();                  Log.e(TAG, "response code:" + res);                  if (res == 200) {                      Log.e(TAG, "request success");                      InputStream input = conn.getInputStream();                      StringBuffer sb1 = new StringBuffer();                      int ss;                      while ((ss = input.read()) != -1) {                          sb1.append((char) ss);                      }                      result = sb1.toString();                      Log.e(TAG, "result : " + result);                  } else {                      Log.e(TAG, "request error");                  }              }          } catch (MalformedURLException e) {              e.printStackTrace();          } catch (IOException e) {              e.printStackTrace();          }          return res;      }  }