发送图像OutputStream

我想在Android中制作图片上传应用程序。我要求用户选择图像，然后将图像转换为输出流。然后我在名为UploadImage的类中使用AsyncTask。我收到一个错误，我不能发送图像，因为它不是String。发送图像OutputStream

我使用Http-Request类将数据从Android发送到PHP。

@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     if (resultCode == RESULT_OK) { 
      Uri selectedImageUri = data.getData(); 
      try { 
       InputStream in = getContentResolver().openInputStream(selectedImageUri); 
       OutputStream out = new FileOutputStream(new File("your_file_here")); 

       byte[] buf = new byte[1024]; 
       int len; 
       while ((len = in.read(buf)) > 0) { 
        out.write(buf, 0, len); 
       } 

       TextView textViewDynamicText = (TextView) findViewById(R.id.textViewDynamicText); // Dynamic text 
       String apiURL = "https://website.com/image_upload/image_upload.php"; 
       UploadImage task = new UploadImage(this, apiURL, out, 
         textViewDynamicText, new UploadImage.TaskListener() { 
        @Override 
        public void onFinished(String result) { 
         // Do Something after the task has finished 
         imageUploadResult(); 
        } 
       }); 
       task.execute(); 


       out.close(); 
       in.close(); 
      } 
      catch (java.io.FileNotFoundException e) { 
       Toast.makeText(this, "java.io.FileNotFoundException: " + e.toString(), Toast.LENGTH_LONG).show(); 
      } 
      catch (java.io.IOException e) { 
       Toast.makeText(this, "java.io.IOException: " + e.toString(), Toast.LENGTH_LONG).show(); 
      } 

     } // RESULT_OK 
    } // onActivityResult

UploadImage类：

import android.content.Context; 
import android.graphics.Bitmap; 
import android.os.AsyncTask; 
import android.os.Environment; 
import android.widget.TextView; 
import android.widget.Toast; 

import java.io.File; 
import java.io.FileOutputStream; 
import java.io.OutputStream; 

/** 
* Created by bruker on 08.08.2017. 
*/ 

public class UploadImage extends AsyncTask<String, Void, String> { 

    /* Class variables */ 
    private Context context; // Holder (this) 
    private String apiUrl; // URL for image upload form, example http://website.com/image_upload.php 
    private TextView dynamicText; 
    private OutputStream out; 

    private final UploadImage.TaskListener taskListener; // This is the reference to the associated listener 


    public interface TaskListener { 
     public void onFinished(String result); 
    } 

    /*- Constructor GET, SEND --------------------------------------------------------------- */ 
    public UploadImage(Context ctx, String applicationPIUrl, OutputStream output, TextView textViewDynamicText, UploadImage.TaskListener listener) { 
     context    = ctx; 
     apiUrl    = applicationPIUrl; 
     out     = output; 
     dynamicText   = textViewDynamicText; 
     this.taskListener = listener; // The listener reference is passed in through the constructor 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     dynamicText.setText("Loading..."); 
    } 


    @Override 
    protected String doInBackground(String... params) { 
     // Run methods 
     String stringResponse =""; 
     try { 
      try{ 
       // Send image 
       HttpRequest request = HttpRequest.post(apiUrl); // Post form 
       request.part("inp_image", out); // send form image 
       stringResponse = request.body(); 
      } 
      catch (Exception e){ 
       return e.toString(); 
      } 
     } 
     catch(Exception e){ 
      return e.toString(); 
     } 
     return stringResponse; 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     // Set text view with result string 
     if(dynamicText == null){ 
      Toast.makeText(context, "NULL", Toast.LENGTH_SHORT).show(); 
     } 
     else { 
      dynamicText.setText(result); 
     } 
     // In onPostExecute we check if the listener is valid 
     if(this.taskListener != null) { 
      // And if it is we call the callback function on it. 
      this.taskListener.onFinished(result); 
     } 
    } 

    @Override 
    protected void onProgressUpdate(Void... values) {} 

}

来源

2017-08-08 Solo

也许有点混乱，HttpRequest.part() takes an InputStream, not an OutputStream。它实际上使你的代码更简单，因为你不需要做那些奇怪的事情，从InputStream复制到OutputStream。这应该工作：

protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     if (resultCode == RESULT_OK) { 
      Uri selectedImageUri = data.getData(); 
      try { 
       InputStream in = getContentResolver().openInputStream(selectedImageUri); 

       TextView textViewDynamicText = (TextView) findViewById(R.id.textViewDynamicText); // Dynamic text 
       String apiURL = "https://website.com/image_upload/image_upload.php"; 
       UploadImage task = new UploadImage(this, apiURL, in, 
         textViewDynamicText, new UploadImage.TaskListener() { 
        @Override 
        public void onFinished(String result) { 
         // Do Something after the task has finished 
         imageUploadResult(); 
        } 
       }); 
       task.execute(); 

       in.close(); 
      } 
      catch (java.io.FileNotFoundException e) { 
       Toast.makeText(this, "java.io.FileNotFoundException: " + e.toString(), Toast.LENGTH_LONG).show(); 
      } 
      catch (java.io.IOException e) { 
       Toast.makeText(this, "java.io.IOException: " + e.toString(), Toast.LENGTH_LONG).show(); 
      } 

     } // RESULT_OK 
    } // onActivityResult

在UploadImage：

import android.content.Context; 
import android.graphics.Bitmap; 
import android.os.AsyncTask; 
import android.os.Environment; 
import android.widget.TextView; 
import android.widget.Toast; 

import java.io.File; 
import java.io.InputStream; 

/** 
* Created by bruker on 08.08.2017. 
*/ 

public class UploadImage extends AsyncTask<String, Void, String> { 

    /* Class variables */ 
    private Context context; // Holder (this) 
    private String apiUrl; // URL for image upload form, example http://website.com/image_upload.php 
    private TextView dynamicText; 
    private InputStream in; 

    private final UploadImage.TaskListener taskListener; // This is the reference to the associated listener 


    public interface TaskListener { 
     public void onFinished(String result); 
    } 

    /*- Constructor GET, SEND --------------------------------------------------------------- */ 
    public UploadImage(Context ctx, String applicationPIUrl, InputStream input, TextView textViewDynamicText, UploadImage.TaskListener listener) { 
     context    = ctx; 
     apiUrl    = applicationPIUrl; 
     in     = input; 
     dynamicText   = textViewDynamicText; 
     this.taskListener = listener; // The listener reference is passed in through the constructor 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     dynamicText.setText("Loading..."); 
    } 


    @Override 
    protected String doInBackground(String... params) { 
     // Run methods 
     String stringResponse =""; 
     try { 
      try{ 
       // Send image 
       HttpRequest request = HttpRequest.post(apiUrl); // Post form 
       request.part("inp_image", in); // send form image 
       stringResponse = request.body(); 
      } 
      catch (Exception e){ 
       return e.toString(); 
      } 
     } 
     catch(Exception e){ 
      return e.toString(); 
     } 
     return stringResponse; 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     // Set text view with result string 
     if(dynamicText == null){ 
      Toast.makeText(context, "NULL", Toast.LENGTH_SHORT).show(); 
     } 
     else { 
      dynamicText.setText(result); 
     } 
     // In onPostExecute we check if the listener is valid 
     if(this.taskListener != null) { 
      // And if it is we call the callback function on it. 
      this.taskListener.onFinished(result); 
     } 
    } 

    @Override 
    protected void onProgressUpdate(Void... values) {} 

}

来源

2017-08-08 20:55:35 amacf

谢谢。现在我从PHP脚本“Missing inp_image name”中收到错误消息。我会为此提出一个新问题。 – Solo

发送图像OutputStream

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