如何将图像从库上传到服务器？
我正在尝试从我的图库中浏览图片并尝试在服务器中发送它并使用json跟随本教程http://androidexample.com/Upload_File_To_Server_-_Android_Example/index.php?view=article_discription&aid=83&aaid=106但是每当我尝试上传它时显示文件已成功上传，但是当我点击浏览按钮时我的gallary显示什么都没有，所以我需要首先从图库浏览并在我的imageview中显示该图像，然后上传成功任何身体告诉我什么是问题？
UploadToServer：
public class UploadToServer extends Activity {
TextView messageText;
Button uploadButton;
int serverResponseCode = 0;
ProgressDialog dialog = null;
String upLoadServerUri = null;
/********** File Path *************/
final String uploadFilePath = "/mnt/sdcard/Pictures/";
final String uploadFileName = "service_lifecycle.png";
private static int RESULT_LOAD_IMAGE = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload_to_server);
ImageView buttonLoadImage = (ImageView) findViewById(R.id.buttonLoadPicture);
buttonLoadImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
uploadButton = (Button)findViewById(R.id.uploadButton);
messageText = (TextView)findViewById(R.id.messageText);
messageText.setText("Uploading file path :- '/mnt/sdcard/Pictures/"+uploadFileName);
/************* Php script path ****************/
upLoadServerUri = "http://www.androidexample.com/media/UploadToServer.php";
uploadButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog = ProgressDialog.show(UploadToServer.this, "", "Uploading file...", true);
new Thread(new Runnable() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("uploading started.....");
}
});
uploadFile(uploadFilePath + "" + uploadFileName);
}
}).start();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImageUri = data.getData();
String tempPath = getPath(selectedImageUri, this);
//add this
ImageView imageView = (ImageView) findViewById(R.id.imgView);
imageView.setImageBitmap(BitmapFactory.decodeFile(tempPath ));
}
}
private String getPath(Uri uri, UploadToServer uploadToServer) {
if( uri == null ) {
return null;
}
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
if( cursor != null ){
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
return uri.getPath();
}
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 :"
+uploadFilePath + "" + uploadFileName);
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Source File not exist :"
+uploadFilePath + "" + uploadFileName);
}
});
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("uploaded_file", fileName);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_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"
+" http://www.androidexample.com/media/uploads/"
+uploadFileName;
messageText.setText(msg);
Toast.makeText(UploadToServer.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(UploadToServer.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(UploadToServer.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
}
}
3 个答案:
答案 0 :(得分：0)
您应该尝试更新uploadFilePath变量。首先使用Environment.getExternalStoragePublicDirectory()获取顶级外部存储目录，然后添加图像的相对路径以访问要上载的文件。以下是文档：http://developer.android.com/reference/android/os/Environment.html#getExternalStoragePublicDirectory(java.lang.String)
答案 1 :(得分：0)
您可以像这样使用多部分图片上传。
- 创建AsyncTask
ArrayList productFiles = new ArrayList（）;
class UploadImageTask extends AsyncTask<String, Integer, String>
{
ProgressDialog dialog;
@Override
protected String doInBackground(String... params)
{
int isCover = 0;
String gal_image = "";
for (int i = 0; i < productFiles.size(); i++)
{
if (i == 0)
isCover = 1;
else
isCover = 0;
publishProgress(i + 1);
String s = HelperHttp.uploadFile(productFiles.get(i),
Constants.BASE_URL + "send_image.php", params[0],
isCover + "");
try {
JSONObject job = new JSONObject(s);
if (job.optInt("status") == 1) {
Helper.Log("Upload success", i + " done");
if (gal_image.equals(""))
gal_image = job.optString("gal_image");
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return gal_image;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = DialogManager.getProgressDialog(SellActivity.this);
dialog.setMessage("uploading 1 of " + productFiles.size()+ " image(s)");
}
@Override
protected void onPostExecute(final String result) {
super.onPostExecute(result);
dialog.dismiss();
}
}
2。 使用方法上传文件创建Helper类，如下所示
public static String uploadFile(File file, String url, String productId,String isCover)
{
StringBuffer data = new StringBuffer();
HttpPost httpost = new HttpPost(url);
Helper.Log("Upload file", url);
MultipartEntity entity = new MultipartEntity();
entity.addPart("uploadfile", new FileBody(file));
try
{
entity.addPart("txtProductId", new StringBody(productId));
}
catch (UnsupportedEncodingException e1)
{
e1.printStackTrace();
}
httpost.setEntity(entity);
HttpResponse response;
try {
response = getThreadSafeClient().execute(httpost);
HttpEntity entity2 = response.getEntity();
InputStream is = entity2.getContent();
BufferedReader reader = new BufferedReader( new InputStreamReader(is), 8192);
String line = null;
while ((line = reader.readLine()) != null)
{
data.append(line);
}
response.getEntity().consumeContent();
Helper.Log("Response==>", data.toString() + "");
return data.toString();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return "";
}
您还可以添加参数以进行请求。 要在代码
之后添加参数entity.addPart("Key", value);
答案 2 :(得分：-1)
将图像转换为位图
ByteArrayOutputStream baos = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
将encodedImage作为字符串发送到服务器，在服务器级解码以获取字符串
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