使用截击上传pdf，但在服务器文件夹中获取空文件 [英] uploading a pdf using volley but gets null file on server folder
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问题描述
我正在使用volley库在主机托管人域上的数据库以及同一主机托管人域中的文件夹中上载pdf文件
I am uploading a pdf file using volley library in database on hostinger domain and also in folder on same hostinger domain
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
I used php server script where i added a query to insert file into my database folder and in server folder named uploads
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服务器的文件夹中，但是它的大小为0，即为null，所以没有用...告诉我如何修改此代码.??
I dont know where i am getting problme as file is going into database table and also in folder in my server but it's size is 0 i.e. it is null so it is of no use ... tell me how to modify this code.??
我尝试了convertFileToBase64String，但它也获取了空文件
在activtyonresult中，我尝试了此代码
I tried convertFileToBase64String but it gets null file too
in activtyonresult i tried this code
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();
}
我用它来上传文件
params.put("file", encodedBase64);
，当我用烤面包来看看encodedBase64的长度时，结果为0，与'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
and when i used toast to see lenght of encodedBase64 it results 0 , same for 'file','fileinputreader','bytes'
so i think it is not right or may be i am wrong..correct me
我尝试了这段代码，但它的值为空....好像我没有选择任何文件，或者文件在某处迷路了...
i tried this code but it gets null value....as if i didnt pick any file or the fle get lost there somewhere...
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;
}
推荐答案
尝试一下，
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";
}
这篇关于使用截击上传pdf，但在服务器文件夹中获取空文件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！
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