使用 volley 上传 pdf，但在服务器文件夹中获取空文件

Question

我正在使用托管域数据库中的 volley 库以及同一托管域的文件夹中上传 pdf 文件

这是我的xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@color/colorAccent"
tools:context="com.example.singhharpal.fileupload_apr26.MainActivity">

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:textSize="18sp"
    android:id="@+id/tvHeading"
    android:text="Touch the icon below to upload file to server"
    android:textColor="#fff"
    android:textStyle="bold"/>
<Button
    android:id="@+id/ivAttachment"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="CHoose"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"/>

<TextView
    android:id="@+id/tv_file_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="#fff"
    android:layout_marginTop="10dp"
    android:gravity="center"
    android:layout_below="@+id/ivAttachment"
    android:layout_centerHorizontal="true"/>

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/b_upload"
    android:text="Upload"
    android:textStyle="bold"
    android:textSize="20sp"
    android:layout_alignParentBottom="true"
    android:gravity="center"
    android:textColor="#fff"
    android:background="#039be5"/>

我的java文件

package com.example.singhharpal.fileupload_apr26;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
//import com.squareup.picasso.Picasso;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Hashtable;
import java.util.Map;

public class MainActivity extends AppCompatActivity implements     view.OnClickListener
{
private Button buttonClick;
private Button buttonChoose;
private Button buttonUpload;
private ImageView imageView;
File file;
private Bitmap bitmap;
private int PICK_IMAGE_REQUEST = 200;
String filename;
String s1,s2;
private String UPLOAD_URL ="http://harpal-projects.16mb.com/sbbs/php/file-upload2.php";
private String KEY_IMAGE = "image";
private String KEY_NAME = "fname";
private String KEY_ROLL = "roll_no";


@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
/*
    Button textView = (TextView) findViewById(R.id.userName);
    TextView t1 = (TextView) findViewById(R.id.textView4);
    TextView t2 = (TextView) findViewById(R.id.textView5);
*/

   /*// SharedPreferences sharedPreferences=getActivity().getSharedPreferences("userInfo",getActivity().MODE_PRIVATE);       //my settings is file name

    s1=sharedPreferences.getString("username","");
    s2=sharedPreferences.getString("password","");
    t1.setText(s1);
    t2.setText(s2);*/

    //textView.setText("Welcome User " + intent.getStringExtra(RegisterStudent.KEY_USERNAME));
    buttonChoose = (Button)findViewById(R.id.ivAttachment);
    //buttonClick = (Button)findViewById(R.id.clickPic);
    buttonUpload = (Button)findViewById(R.id.b_upload);
    //imageView  = (ImageView)findViewById(R.id.imageView);

    buttonChoose.setOnClickListener(this);
    buttonUpload.setOnClickListener(this);
}

@Override
public void onClick(View v)
{
    if(v == buttonChoose)
    {
        showFileChooser();
    }
    if(v == buttonUpload)
    {
        uploadImage();
    }
}

private void showFileChooser()
{
    Intent intent = new Intent();
    intent.setType("application/pdf");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent, "Select File"), PICK_IMAGE_REQUEST);

    /*Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
    intent.setType("image*//*;application/pdf");
    intent.addCategory(Intent.CATEGORY_OPENABLE);

    // special intent for Samsung file manager
    Intent sIntent = new Intent("com.sec.android.app.myfiles.PICK_DATA_MULTIPLE");
    // if you want any file type, you can skip next line
    sIntent.putExtra("CONTENT_TYPE", "application/pdf");
    sIntent.addCategory(Intent.CATEGORY_DEFAULT);

    Intent chooserIntent;
    if (getPackageManager().resolveActivity(sIntent, 0) != null)
    {
        // it is device with samsung file manager
        chooserIntent = Intent.createChooser(sIntent, "Open file");
        chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] { intent});
    }
    else
    {
        chooserIntent = Intent.createChooser(intent, "Open file");
    }


    startActivityForResult(chooserIntent, 100);*/
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null)
    {
        Uri filePath = data.getData();
        Toast.makeText(MainActivity.this, ""+filePath, Toast.LENGTH_SHORT).show();

        filename=filePath.getLastPathSegment();
        Toast.makeText(MainActivity.this, ""+filename, Toast.LENGTH_SHORT).show();

            file = new File(filePath.toString());
            getStringFile(file);

    }
}

public String getStringFile(File f)
{
    StringBuilder sb = new StringBuilder();
    try
    {
        FileInputStream fileInputStream = new FileInputStream(file);

        BufferedReader reader = new BufferedReader(new InputStreamReader(fileInputStream));

        String line ;
        while ((line = reader.readLine()) != null)
        {
            sb.append(line).append("\n");
            reader.close();
        }
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    return sb.toString();
}

private void uploadImage()
{
    //Showing the progress dialog
    final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
    StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String s)
                {
                    //Disimissing the progress dialog
                    loading.dismiss();
                    //Showing toast message of the response
                    Toast.makeText(getBaseContext(), s, Toast.LENGTH_LONG).show();
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError volleyError) {
                    //Dismissing the progress dialog
                    loading.dismiss();
                    //Showing toast
                    Toast.makeText(getBaseContext(), volleyError.toString(), Toast.LENGTH_LONG).show();
                }
            }){
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            //Converting Bitmap to String
            String doc = getStringFile(file);

            //Getting Image Name
            //Creating parameters
            Map<String,String> params = new Hashtable<String, String>();

            //Adding parameters
            params.put("file", doc);
            params.put("fname", filename);



            //returning parameters
            return params;
        }
    };
    stringRequest.setRetryPolicy(new DefaultRetryPolicy(){
                                     @Override
                                     public int getCurrentTimeout() {
                                         return 50000;
                                     }

                                     @Override
                                     public int getCurrentRetryCount() {
                                         return 50000;
                                     }

                                     @Override
                                     public void retry(VolleyError error) throws VolleyError {

                                     }
                                 }
    );

    //Creating a Request Queue
    RequestQueue requestQueue = Volley.newRequestQueue(getBaseContext());

    //Adding request to the queue
    requestQueue.add(stringRequest);

}
}  

我使用了 php 服务器脚本，在其中添加了一个查询以将文件插入到我的数据库文件夹和名为 uploads 的服务器文件夹中

这是我的 php 脚本

<?php
 $con = mysqli_connect(HOST,USER,PASS,DB) or die('Unable to Connect');

$file = $_POST['file'];
$fname = $_POST['fname'];

$file_path = "uploads/";
$actualpath = "http://harpal-projects.16mb.com/sbbs$file_path";

 $sql = "INSERT INTO files (file,fname) VALUES ('$actualpath','$fname') ";

 if(mysqli_query($con,$sql))
 {
             file_put_contents($file_path,base64_decode($file));

        echo "success";

 }else{
        echo "fail";
    }
?>  

我不知道我在哪里遇到问题，因为文件正在进入数据库表以及我服务器的文件夹中，但它的大小为 0，即它为空，所以它没有用...告诉我如何修改此代码.??

我尝试了 convertFileToBase64String，但它也得到了空文件
在 activtyonresult 我试过这个代码

if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null)
    {
        Uri filePath = data.getData();
        Toast.makeText(MainActivity.this, ""+filePath, Toast.LENGTH_SHORT).show();

        filename=filePath.getLastPathSegment();
        Toast.makeText(MainActivity.this, ""+filename, Toast.LENGTH_LONG).show();

            file = new File(filePath.toString());

        try {
            FileInputStream fileInputStreamReader = new FileInputStream(file);
            byte[] bytes = new byte[(int)file.length()];
            fileInputStreamReader.read(bytes);
            encodedBase64 = new String(Base64.encodeBase64(bytes));

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
           // doc=getStringFile(file);
        //Toast.makeText(MainActivity.this, ""+doc.length(), Toast.LENGTH_SHORT).show();

    }  

我用这个来上传文件

params.put("file", encodedBase64);  

当我使用 toast 来查看 encodedBase64 的长度时，结果为 0 ，对于 'file','fileinputreader','bytes' 相同
所以我认为这是不对的，或者可能是我错了..纠正我

我尝试了这段代码，但它得到了空值......好像我没有选择任何文件或者文件在某个地方丢失了......

 public String convertFileToBase64String(File f) throws FileNotFoundException
{
    InputStream inputStream = new FileInputStream(f.getAbsolutePath());
    byte[] bytes;
    byte[] buffer = new byte[8192];
    int bytesRead;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {while ((bytesRead = inputStream.read(buffer)) != -1)
    {
        baos.write(buffer, 0, bytesRead);
    }
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    bytes = baos.toByteArray();

    encodedFile = Base64.encodeToString(bytes, Base64.DEFAULT);
    return encodedFile;
}

Answer 1

试试这个，

在 java 中：

String encode = Base64.encodeToString(bytes, Base64.DEFAULT);

在 php 中：

$file = $_POST['file']['name'];

//$fname = $_POST['fname']['tmp_name'];

$fname = $_POST['file']['tmp_name'];

$file_path = "uploads/";
$actualpath = "http://harpal-projects.16mb.com/sbbs/$file_path/$file";

$sql = "INSERT INTO files (file,fname) VALUES ('$actualpath','$fname') ";

if(mysqli_query($con,$sql))
{

    file_put_contents(base64_decode($file), $file_path);
    echo "success";
}
else{

    echo "fail";
}

Answer 2

您不能将 pdf 文件放在字符串中。但是，您可以做的是将 pdf 文件 base64 编码为字符串。就这样做吧。 php 脚本需要这样。将你的函数命名为convertFileToBase64String()。