Android 上传图片到服务器

界面很简单，点击 【选择图片】，从图库里选择图片，显示到下面的imageview里，点击上传，就会上传到指定的服务器

 

 

布局文件：

 

    <?xml version="1.0" encoding="utf-8"?>      <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>  

Upload Activity：

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. */@Overridepublic 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);}@Overridepublic 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;}}@Overrideprotected 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();}}

这个才是重点 UploadUtil:

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;}}