php在android中将图像上传到服务器

Question

我正在使用允许从图库中选择图像并将其上传到在线网络托管服务的 php 脚本。图片上传了，但是上传的.jpg文件是空的，命名为0.jpg，大小也显示为0字节。当我尝试打开它显示的图像时

"图片http://testimage.site88.net/pic/0.jpg无法显示 因为它包含错误”

这可能是什么原因？ php代码如下

 <?php
    $name = $_POST['name']; //image name
    $image = $_POST['image']; //image in string format

    //decode the image
    $decodedImage = base64_decode($image);

    //upload the image
    file_put_contents("pic/".$name.".jpg", $decodedImage);

安卓代码是：

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;


public class MainActivity extends Activity {
    //define global views variable
    public ImageView imageView;
    public Button   selectImage,
                    uploadImage;
    public String SERVER = "http://testimage.site88.net/saveImage.php",
                    timestamp;

    private static final String TAG = MainActivity.class.getSimpleName();

    private static final int RESULT_SELECT_IMAGE = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //instantiate view
        imageView = (ImageView) findViewById(R.id.imageView);
        selectImage = (Button) findViewById(R.id.selectImage);
        uploadImage = (Button) findViewById(R.id.uploadImage);

        //when selectImage button is pressed
        selectImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //call the function to select image from album
                selectImage();
            }
        });

        //when uploadImage button is pressed
        uploadImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //get image in bitmap format
                Bitmap image = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
                //execute the async task and upload the image to server
                new Upload(image,"IMG_"+timestamp).execute();
            }
        });

    }

    //function to select a image
    private void selectImage(){
        //open album to select image
        Intent gallaryIntent = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(gallaryIntent, RESULT_SELECT_IMAGE);
    }

    /*
    * This function is called when we pick some image from the album
    * */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RESULT_SELECT_IMAGE && resultCode == RESULT_OK && data != null){
            //set the selected image to image variable
            Uri image = data.getData();
            imageView.setImageURI(image);

            //get the current timeStamp and strore that in the time Variable
            Long tsLong = System.currentTimeMillis() / 1000;
            timestamp = tsLong.toString();

            Toast.makeText(getApplicationContext(),timestamp,Toast.LENGTH_SHORT).show();
        }
    }

    private String hashMapToUrl(HashMap<String, String> params) throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;
        for(Map.Entry<String, String> entry : params.entrySet()){
            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
        }

        return result.toString();
    }


    //async task to upload image
    private class Upload extends AsyncTask<Void,Void,String>{
        private Bitmap image;
        private String name;

        public Upload(Bitmap image,String name){
            this.image = image;
            this.name = name;
        }

        @Override
        protected String doInBackground(Void... params) {
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            //compress the image to jpg format
            image.compress(Bitmap.CompressFormat.JPEG,100,byteArrayOutputStream);
            /*
            * encode image to base64 so that it can be picked by saveImage.php file
            * */
            String encodeImage = Base64.encodeToString(byteArrayOutputStream.toByteArray(),Base64.DEFAULT);

            //generate hashMap to store encodedImage and the name
            HashMap<String,String> detail = new HashMap<>();
            detail.put("name", name);
            detail.put("image", encodeImage);

            try{
                //convert this HashMap to encodedUrl to send to php file
                String dataToSend = hashMapToUrl(detail);
                //make a Http request and send data to saveImage.php file
                String response = Request.post(SERVER,dataToSend);

                //return the response
                return response;

            }catch (Exception e){
                e.printStackTrace();
                Log.e(TAG,"ERROR  "+e);
                return null;
            }
        }



        @Override
        protected void onPostExecute(String s) {
            //show image uploaded
            Toast.makeText(getApplicationContext(),"Image Uploaded",Toast.LENGTH_SHORT).show();
        }
    }
}

提前致谢。

Answer 1

我认为你只需要修复 php 文件。我在您的问题中对其进行了编辑，因为它没有意义。使用现有的。

如果您需要更多帮助，请给我们输出

error_log(print_r($_POST, 1));

来自 php 日志。