我讨厌发布这么长的代码示例，但是我无法弄清楚它为什么不起作用，所以我唯一能想到的就是分享这些混乱。
我在这里遵循本指南： http://www.coderefer.com/android-upload-file-to-server/
我通过网页浏览处理它，所以我不得不对接口部分的工作方式进行一些更改，我必须添加一些代码才能获得权限，因为我在Marshmallow：
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_READ_CONTACTS);
但从我可以说的一切都是关于android活动的，因为我现在没有得到任何错误，因为我已经获得了权限。
我在这里通过了我能够成功收集到此功能的路径：
public int uploadFile(final String selectedFilePath){
int serverResponseCode = 0;
HttpURLConnection connection;
DataOutputStream dataOutputStream;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead,bytesAvailable,bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File selectedFile = new File(selectedFilePath);
String[] parts = selectedFilePath.split("/");
final String fileName = parts[parts.length-1];
if (!selectedFile.isFile()){
// dialog.dismiss();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"Source File Doesn't Exist: " + selectedFilePath,Toast.LENGTH_SHORT).show();
}
});
return 0;
}else{
try{
FileInputStream fileInputStream = new FileInputStream(selectedFile);
URL url = new URL(SERVER_URL);
connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);//Allow Inputs
connection.setDoOutput(true);//Allow Outputs
connection.setUseCaches(false);//Don't use a cached Copy
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("ENCTYPE", "multipart/form-data");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
connection.setRequestProperty("uploaded_file",selectedFilePath);
//creating new dataoutputstream
dataOutputStream = new DataOutputStream(connection.getOutputStream());
//writing bytes to data outputstream
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ selectedFilePath + "\"" + lineEnd);
dataOutputStream.writeBytes(lineEnd);
//returns no. of bytes present in fileInputStream
bytesAvailable = fileInputStream.available();
//selecting the buffer size as minimum of available bytes or 1 MB
bufferSize = Math.min(bytesAvailable,maxBufferSize);
//setting the buffer as byte array of size of bufferSize
buffer = new byte[bufferSize];
//reads bytes from FileInputStream(from 0th index of buffer to buffersize)
bytesRead = fileInputStream.read(buffer,0,bufferSize);
//loop repeats till bytesRead = -1, i.e., no bytes are left to read
while (bytesRead > 0){
//write the bytes read from inputstream
dataOutputStream.write(buffer,0,bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable,maxBufferSize);
bytesRead = fileInputStream.read(buffer,0,bufferSize);
}
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
final String result = getStringFromInputStream(connection.getInputStream());
//Log.i(TAG, "Server Response is: " + serverResponseMessage + ": " + serverResponseCode);
//response code of 200 indicates the server status OK
if(serverResponseCode == 200){
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,result,Toast.LENGTH_SHORT).show();
}
});
}
//closing the input and output streams
fileInputStream.close();
dataOutputStream.flush();
dataOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"File Not Found",Toast.LENGTH_SHORT).show();
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "URL error!", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Cannot Read/Write File!", Toast.LENGTH_SHORT).show();
}
// dialog.dismiss();
return serverResponseCode;
}
}
我能够“失败”。使用他的php方法从我的服务器回复：
$file_path = "uploads/";
$file_path = $file_path . basename( $_FILES['uploaded_file']['name']);
if(move_uploaded_file($_FILES['uploaded_file']['tmp_name'], $file_path) ){
echo "success";
} else{
echo "fail";
}
?>
然而，在我看来，$ _FILES [＆＃39; uploaded_file＆＃39;]是空的，因为我每次都会失败作为回应。当我在其上使用var_dump（$ _ FILES [＆＃39; uploaded_file＆＃39;]）时，我从输入流中获取toast消息，它是null。什么都没有得救。我正在尝试发送不超过100kb的小图片，并且我可以通过浏览器上传图片。
非常感谢您对此的任何帮助，谢谢您的时间！
答案 0 :(得分：0)
尝试使用以下文件上传器类
afterEvaluate {
android.applicationVariants.each { variant ->
variant.javaCompile.doLast {
javaexec {
classpath += variant.javaCompile.classpath
classpath += files(variant.javaCompile.destinationDir)
main = 'com.mydomain.Main'
}
}
}
}
在服务器端，通过更改某些功能添加以下代码
'com.android.tools.build:gradle:2.1.0'import android.util.Log;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import in.gauriinfotech.sevadeal.constants.RestConstants;
/**
* Created by NiRRaNjAN on 23/02/2016.
*/
public class FileUploader implements RestConstants {
public static String sendFileToServer(File filename, String targetUrl, String vendorId, String type) {
String response = "error";
HttpURLConnection connection = null;
DataOutputStream outputStream = null;
String urlServer = targetUrl;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 512;
try {
Log.e(tag, "+++++++++++ FILE NAME TO UPLOAD :: " + filename.getAbsolutePath());
FileInputStream fileInputStream = new FileInputStream(filename);
Log.e(tag, "++++++++++++ FILE LENGTH :: " + (filename.length()/1024d) + " Kbytes");
URL url = new URL(urlServer);
connection = (HttpURLConnection) url.openConnection();
// Allow Inputs & Outputs
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
// connection.setChunkedStreamingMode(1024);
// Enable POST method
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
outputStream = new DataOutputStream(connection.getOutputStream());
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
String connstr = null;
connstr = "Content-Disposition: form-data; name=\""+FILE+"\";filename=\""
+ filename.getName() + "\"" + lineEnd;
Log.i("Connstr", connstr);
outputStream.writeBytes(connstr);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// Read file
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
Log.e("Image length", bytesAvailable + "");
try {
while (bytesRead > 0) {
try {
outputStream.write(buffer, 0, bufferSize);
} catch (OutOfMemoryError e) {
e.printStackTrace();
response = "outofmemoryerror";
return response;
}
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
} catch (Exception e) {
e.printStackTrace();
response = "error";
return response;
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
/*
Upload String parameters
* */
Log.e(tag, "++++++++++++ FILE UPLOAD SUCCESS. SENDING TYPE " + type);
outputStream.writeBytes("Content-Disposition: form-data; name=\"" + TYPE + "\"" + lineEnd);
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(type);
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
Log.e(tag, "++++++++++++ TYPE sending succes. Sending VENDOR ID");
outputStream.writeBytes("Content-Disposition: form-data; name=\"" + USER_ID + "\"" + lineEnd);
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(vendorId);
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
Log.e(tag, "++++++++++++ VENDOR ID sent success.");
int serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
Log.i("Server Response Code ", "+++++++++++ SERVER RESPONSE CODE :: " + serverResponseCode);
Log.i("Server Response Message", "+++++++++++ RESPONSE MESSAGE :: '" + serverResponseMessage + "'");
if (serverResponseCode == 200) {
response = "true";
} else {
try {
InputStream inputStream = connection.getErrorStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
StringBuilder builder = new StringBuilder();
while((line = reader.readLine()) != null) {
builder.append(line);
}
reader.close();
Log.e(tag, "++++++++++++ RETURN ERROR FROM SERVER +++++++");
Log.e(tag, builder.toString());
} catch (Exception ex) {
Log.e(tag, Log.getStackTraceString(ex));
}
}
fileInputStream.close();
outputStream.flush();
outputStream.close();
// outputStream = null;
} catch (Exception ex) {
// Exception handling
response = "error";
Log.e("Send file Exception", ex.getMessage() + "");
ex.printStackTrace();
}
return response;
}
}
文件中声明。例如<?php
require_once('conn.php');
ini_set('display_errors', 'on');
ini_set('memory_limit', '512M');
date_default_timezone_set("Asia/Calcutta");
$response = array();
$uploadFileName = $_FILES[$FILE]['name'];
$info = pathinfo($uploadFileName);
$ext = $info['extension'];
$response[$VENDOR_ID] = $_POST[$VENDOR_ID];
$response[$TYPE] = $_POST[$TYPE];
$response["size"] = $_FILES[$FILE]['size'];
if(isset($_POST[$TYPE]) && $_FILES[$FILE]['size'] > 0 && isset($_POST[$VENDOR_ID])) {
$mysqli = Database::getInstance();
$date = date("d_m_Y_h_i_s_A.");
$type = $_POST[$TYPE];
$vendorID = $_POST[$VENDOR_ID];
if(!is_dir($PROFILE_FOLDER)) {
mkdir($PROFILE_FOLDER);
}
if(!is_dir($IMAGES_FOLDER)) {
mkdir($IMAGES_FOLDER);
}
if(!is_dir($VIDEOS_FOLDER)) {
mkdir($VIDEOS_FOLDER);
}
$fileName;
$query;
if($type == $PROFILE_PIC) {
$fileName = $PROFILE_FOLDER . $date . $ext;
$query = "UPDATE $PROFILE_PIC SET $PICTURE_PATH=? WHERE $VENDOR_ID=?";
} else if($type == $IMAGES) {
$fileName = $IMAGES_FOLDER . $date . $ext;
$query = "INSERT INTO $PROMOTIONAL_PIC ($PICTURE_PATH, $VENDOR_ID) VALUES (?,?)";
} else if($type == $VIDEOS) {
$fileName = $VIDEOS_FOLDER . $date . $ext;
$query = "INSERT INTO $PROMOTIONAL_VIDEO ($VIDEO_PATH, $VENDOR_ID) VALUES (?,?)";
} else {
$response[$STATUS] = "Type $type not supported. ";
echo json_encode($response);
exit();
}
$tmpName = $_FILES[$FILE]['tmp_name'];
/* $fp = fopen($tmpName, 'r');
$content = fread($fp, filesize($tmpName));
fclose($fp);
$fp = fopen($fileName, 'w');
if(fwrite($fp, $content)) {*/
if(move_uploaded_file($tmpName, $fileName)) {
$stmt = $mysqli->prepare($query);
$stmt->bind_param('ss', $fileName, $vendorID);
if($stmt->execute()) {
$response[$STATUS] = $SUCCESS;
} else {
$response[$STATUS] = "Failed to inesrt into database. " . mysqli_error($mysqli);
}
} else {
$response[$STATUS] = "Failed to write file.";
}
$content = addslashes($content);
} else {
$response[$STATUS] = "Invalid input";
}
echo json_encode($response);
?>