从相机捕获图像并将其直接发送到服务器 [英] capture image from camera and send it directly to server
本文介绍了从相机捕获图像并将其直接发送到服务器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试编写一个小代码，允许我从相机拍摄后直接发送图片，这意味着当我从相机拍摄图片时，该图片将直接发送到服务器，而无需存储在我的相机中电话或sdcard中的代码，所以我编写了此代码，但我不知道它是否正确，因为实际上它显示了很多消息错误，但我不知道问题出在哪里，或者有人可以告诉我在哪里可以找到类似的代码，
I'm trying to write a small code that allows me to send picture directly after taking it from the camera, I mean when I take picture from the camera, this picture will be sent directly to the server without to store in my phone or in the sdcard, So I made this Code but I dont know if it is correct, because Actually it shows me much message error but I don't know where is the problem or if someone can tell me where can I find similar code,
// Upload Direct From Camera
camButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent_gallery = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
intent_gallery.putExtra( MediaStore.EXTRA_OUTPUT, SERVER_URL + "uploadFromCamera.php" );
startActivityForResult(intent_gallery, SELECT_IMAGE);
}
});
...
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_IMAGE) {
Uri selectedImageUri = data.getData();
String selectedImagePath = getPath( selectedImageUri );
String url = SERVER_URL + "uploadFromCamera.php";
if ( selectedImagePath != null ) {
//Send to server
}
}
}
}
public String getPath(Uri uri) {
String result = null;
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
if(cursor.moveToFirst()){;
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
result = cursor.getString(column_index);
}
cursor.close();
return result;
}
推荐答案
此代码有助于将图像上传到TomCat服务器.
This code helps to upload a image to TomCat server.
Android应用
import java.io.ByteArrayOutputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.support.v7.app.ActionBarActivity;
import android.annotation.SuppressLint;
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.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Base64;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
@SuppressLint("NewApi")
public class MainActivity extends Activity {
ProgressDialog prgDialog;
String encodedString;
RequestParams params = new RequestParams();
String imgPath, fileName;
Bitmap bitmap, lesimg;
private static int RESULT_LOAD_IMG = 1;
private static int REQUEST_IMAGE_CAPTURE = 1;
private static String TIME_STAMP="null";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prgDialog = new ProgressDialog(this);
prgDialog.setCancelable(false);
}
public void loadImagefromGallery(View view) {
Intent galleryIntent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, RESULT_LOAD_IMG);
}
public void dispatchTakePictureIntent(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ImageView imgView = (ImageView) findViewById(R.id.imgView);
imgView.setImageBitmap(imageBitmap);
lesimg=imageBitmap;
String currentDateTimeString = DateFormat.getDateTimeInstance().format(new Date());
String hjkl=currentDateTimeString.replaceAll(" ", "_");
String hiop=hjkl.replaceAll(":", "-");
TIME_STAMP=hiop;
fileName=TIME_STAMP+".jpeg";
params.put("filename", fileName);
}
}
public void uploadImage(View v) {
encodeImagetoString();
}
public void encodeImagetoString() {
new AsyncTask<Void, Void, String>() {
protected void onPreExecute() {
};
@Override
protected String doInBackground(Void... params) {
BitmapFactory.Options options = null;
options = new BitmapFactory.Options();
options.inSampleSize = 3;
bitmap=lesimg;
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);
byte[] byte_arr = stream.toByteArray();
encodedString = Base64.encodeToString(byte_arr, 0);
return "";
}
@Override
protected void onPostExecute(String msg) {
prgDialog.setMessage("Calling Upload");
prgDialog.show();
params.put("image", encodedString);
triggerImageUpload();
}
}.execute(null, null, null);
}
public void triggerImageUpload() {
makeHTTPCall();
}
public void makeHTTPCall() {
prgDialog.setMessage("Invoking JSP");
prgDialog.show();
AsyncHttpClient client = new AsyncHttpClient();
client.post("http://Your Ip Address or Localhost:8080/ImageUploadWebApp/uploadimg.jsp",
params, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(String response) {
prgDialog.hide();
Toast.makeText(getApplicationContext(), response,
Toast.LENGTH_LONG).show();
}
@Override
public void onFailure(int statusCode, Throwable error,
String content) {
prgDialog.hide();
if (statusCode == 404) {
Toast.makeText(getApplicationContext(),
"Requested resource not found",
Toast.LENGTH_LONG).show();
}
else if (statusCode == 500) {
Toast.makeText(getApplicationContext(),
"Something went wrong at server end",
Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(
getApplicationContext(),
"Error Occured \n Most Common Error: \n1. Device not connected to Internet\n2. Web App is not deployed in App server\n3. App server is not running\n HTTP Status code : "
+ statusCode, Toast.LENGTH_LONG)
.show();
}
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
if (prgDialog != null) {
prgDialog.dismiss();
}
}
}
Android xml
Android xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imgView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ImageView>
<Button
android:id="@+id/buttonLoadPicture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="0"
android:onClick="dispatchTakePictureIntent"
android:text="Click Picture" >
</Button>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:onClick="uploadImage"
android:text="Upload" />
</LinearLayout>
服务器部分 在Eclipse中创建动态Web项目并使用TomCat Server运行它
Server Part Create a Dynamic Web Project in Eclipse and run it using TomCat Server
WebApp
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.codec.binary.Base64;
public class ManipulateImage {
public static byte[] convertStringtoImage(String encodedImageStr, String fileName) {
byte[] imageByteArray = Base64.decodeBase64(encodedImageStr);
try {
// URL url = new URL("http://www.amrood.com/index.htm?language=en#j2se");
imageByteArray = Base64.decodeBase64(encodedImageStr);
// Write Image into File system - Make sure you update the path
FileOutputStream imageOutFile = new FileOutputStream("C:/Some file Path" + fileName);
imageOutFile.write(imageByteArray);
imageOutFile.close();
System.out.println("Image Successfully Stored");
} catch (FileNotFoundException fnfe) {
System.out.println("Image Path not found" + fnfe);
} catch (IOException ioe) {
System.out.println("Exception while converting the Image " + ioe);
}
return imageByteArray;
}
public static String[] display(){
File folder = new File("C:/Some file Path");
File[] listOfFiles = folder.listFiles();
String [] k = new String[listOfFiles.length];
Arrays.fill(k,"none");
for (int i = 0; i < listOfFiles.length; i++) {
if (listOfFiles[i].isFile()) {
System.out.println("File " + listOfFiles[i].getName());
k[i]="File " + listOfFiles[i].getName();
} else if (listOfFiles[i].isDirectory()) {
System.out.println("Directory " + listOfFiles[i].getName());
}
}
return k;
}
}
Servlet
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;
import java.util.StringTokenizer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DisplayImageServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
static final long serialVersionUID = 1L;
String image_name = "";
ResourceBundle props = null;
String filePath = "";
private static final int BUFSIZE = 100;
private ServletContext servletContext;
public DisplayImageServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("FROM SERVLET");
sendImage(getServletContext(), request, response);
}
public void sendImage(ServletContext servletContext,
HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.servletContext = servletContext;
String reqUrl = request.getRequestURL().toString();
StringTokenizer tokens = new StringTokenizer(reqUrl, "/");
int noOfTokens = tokens.countTokens();
String tokensString[] = new String[noOfTokens];
int count = 0;
while (tokens.hasMoreElements()) {
tokensString[count++] = (String) tokens.nextToken();
}
String folderName = tokensString[noOfTokens - 2];
image_name = tokensString[noOfTokens - 1];
filePath = "/" + folderName + "/" + image_name;
String fullFilePath = "D:/AndroidStudioProjects" + filePath;
System.out.println("FULL PATH :: "+fullFilePath);
doDownload(fullFilePath, request, response);
}
private void doShowImageOnPage(String fullFilePath,
HttpServletRequest request, HttpServletResponse response)
throws IOException {
response.reset();
response.setHeader("Content-Disposition", "inline");
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Expires", "0");
response.setContentType("image/tiff");
byte[] image = getImage(fullFilePath);
OutputStream outputStream = response.getOutputStream();
outputStream.write(image);
outputStream.close();
}
private void doDownload(String filePath, HttpServletRequest request,
HttpServletResponse response) throws IOException {
File fileName = new File(filePath);
int length = 0;
ServletOutputStream outputStream = response.getOutputStream();
ServletContext context = servletContext;
String mimetype = context.getMimeType(filePath);
response.setContentType((mimetype != null) ? mimetype
: "application/octet-stream");
response.setContentLength((int) fileName.length());
response.setHeader("Content-Disposition", "attachment; filename=\""
+ image_name + "\"");
byte[] bbuf = new byte[BUFSIZE];
DataInputStream in = new DataInputStream(new FileInputStream(fileName));
while ((in != null) && ((length = in.read(bbuf)) != -1)) {
outputStream.write(bbuf, 0, length);
}
in.close();
outputStream.flush();
outputStream.close();
}
private byte[] getImage(String filename) {
byte[] result = null;
String fileLocation = filename;
File f = new File(fileLocation);
result = new byte[(int)f.length()];
try {
FileInputStream in = new FileInputStream(fileLocation);
in.read(result);
}
catch(Exception ex) {
System.out.println("GET IMAGE PROBLEM :: "+ex);
ex.printStackTrace();
}
return result;
}
}
将此Jsp放入Web内容
Put this Jsp inside Web Content
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%
String imgEncodedStr = request.getParameter("image");
String fileName = request.getParameter("filename");
System.out.println("Filename: "+ fileName);
if(imgEncodedStr != null){
response.setIntHeader("Refresh", 1);
byte[] imageByteArray=( ManipulateImage.convertStringtoImage(imgEncodedStr, fileName));//edited
System.out.println("Inside if");
out.print("Image upload complete, Please check your directory");
} else{
System.out.println("Inside else");
out.print("Image is empty");
}
%>
您可以在给定的文件夹中看到上传的图像.
You can see the uploaded image in the folder given.
这篇关于从相机捕获图像并将其直接发送到服务器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
