我想从我的应用程序上传一个mp3文件到node.js。 node.js接受两个参数，即email_address和mp3文件。
以下是我使用的代码但未能达到所需的功能。
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(SERVER_PATH);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setConnectTimeout(30000);
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("user_file", fileName);
//conn.connect();
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"user_email\""+ lineEnd);
dos.writeBytes(lineEnd);
dos.writeBytes(EMAIL_ADDRESS);
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"user_file\";filename=\"" + fileName +"\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
int serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Log.i("uploadFile", "HTTP Response is : "
+ serverResponseMessage + ": " + serverResponseCode);
if(serverResponseCode == 200){
Toast.makeText(getApplicationContext() ,"File Upload Complete.",
Toast.LENGTH_SHORT).show();
}
//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
当我运行此代码时，我得到一个异常。抛出的异常对象也为null。因此，作为Android的初学者，我无法找到问题。
答案 0 :(得分：2)
好像您使用android上传。因此，请在下面尝试一下。来自sheetalgiri enter link description here
的信用创建MainActivity.java
package com.example.recorder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageButton;
import org.json.JSONObject;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final AudioRecorder recorder=new AudioRecorder();
final ImageButton recordButton=(ImageButton) findViewById(R.id.recordButton);
recordButton.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
if(motionEvent.getAction()==motionEvent.ACTION_DOWN)
recorder.startRecording();
if(motionEvent.getAction()==motionEvent.ACTION_UP) {
recorder.stopRecording();
}
return false;
}
});
}
}
AudioRecorder.java
package com.example.recorder;
import android.media.MediaRecorder;
import android.os.Environment;
import android.util.Log;
import org.json.JSONObject;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.FutureTask;
/**
* Created by home on 6/9/16.
*/
public class AudioRecorder extends MediaRecorder {
MediaRecorder recorder;
String outputFile;
void startRecording(){
recorder=new MediaRecorder();
outputFile= Environment.getExternalStorageDirectory().getAbsolutePath()+"/recording.amr";
recorder.setAudioSource(AudioSource.MIC);
recorder.setOutputFormat(OutputFormat.AMR_WB);
recorder.setAudioEncoder(AudioEncoder.AMR_WB);
recorder.setAudioSamplingRate(16000);
try{
recorder.setOutputFile(outputFile);
}
catch(Exception e){
Log.e("Output File","failed");
}
try{
recorder.prepare();
}
catch(IOException e){
Log.e("Audio Record", "prepare() failed");
}
recorder.start();
}
void stopRecording(){
recorder.stop();
recorder.reset();
recorder.release();
upload();
}
void readFile(){
InputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(outputFile));
}
catch(FileNotFoundException e){
e.printStackTrace();
}
finally {
if (in != null)
try{
in.close();
}
catch(IOException e){
e.printStackTrace();
}
}
}
public void upload() {
String response=null;
AudioSender sender=new AudioSender(outputFile);
FutureTask<String> uploadTask=new FutureTask<String>(sender);
ExecutorService executorService= Executors.newFixedThreadPool(1);
executorService.execute(uploadTask);
while(true){
if(uploadTask.isDone()){
try{
response=uploadTask.get();
break;
}catch(InterruptedException|ExecutionException e){
e.printStackTrace();
Log.e("Upload","Exception",e.getCause());
}
}
}
}
}
AudioSender.java
package com.example.recorder;
import android.util.Log;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
/**
* Created by home on 6/11/16.
*/
public class AudioSender implements Callable<String> {
String outputFile;
AudioSender(String fileLocation){
outputFile=fileLocation;
}
public String call(){
File output=new File(outputFile);
String response = new String ();
try {
MultipartUtility multipart = new MultipartUtility("http://10.42.0.1:3000/upload");
multipart.addFilePart("audio", output);
response = multipart.finish();
}catch(IOException e){
e.printStackTrace();
}finally {
Log.d("SR", "SERVER REPLIED:");
return response;
}
}
}
MultipartUtility.java
package com.example.recorder;
import android.util.Log;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;
public class MultipartUtility {
private final String boundary;
private static final String LINE_FEED = "\r\n";
private HttpURLConnection httpConn;
private OutputStream outputStream;
/**
* This constructor initializes a new HTTP POST request with content type
* is set to multipart/form-data
*
* @param requestURL
* @throws IOException
*/
public MultipartUtility(String requestURL)
throws IOException {
// creates a unique boundary based on time stamp
boundary = "===" + System.currentTimeMillis() + "===";
URL url = new URL(requestURL);
httpConn = (HttpURLConnection) url.openConnection();
httpConn.setUseCaches(false);
httpConn.setDoOutput(true); // indicates POST method
httpConn.setDoInput(true);
httpConn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
outputStream = httpConn.getOutputStream();
}
/**
* Adds a upload file section to the request
*
* @param fieldName name attribute in <input type="file" name="..." />
* @param uploadFile a File to be uploaded
* @throws IOException
*/
public void addFilePart(String fieldName, File uploadFile)
throws IOException {
String fileName = uploadFile.getName();
FileInputStream inputStream = new FileInputStream(uploadFile);
byte[] buffer = new byte[4096];
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
Log.d("sending",buffer.toString());
}
outputStream.flush();
inputStream.close();
}
/**
* Completes the request and receives response from the server.
*
* @return a list of Strings as response in case the server returned
* status OK, otherwise an exception is thrown.
* @throws IOException
*/
public String finish() throws IOException {
String response = new String();
// checks server's status code first
int status = httpConn.getResponseCode();
if (status == HttpURLConnection.HTTP_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(
httpConn.getInputStream()));
response=reader.readLine();
reader.close();
httpConn.disconnect();
} else {
throw new IOException("Server returned non-OK status: " + status);
}
return response;
}
}
server.js
var express = require('express');
var app = express();
var server = require('http').createServer(app);
var port = process.env.PORT || 8080;
var globalres;
server.listen(port, function () {
console.log('Server listening at port %d', port);
});
var fs= require('fs');
var chunks=[];
var path='audio.amr';
app.get('/', function (req, res) {
res.send('Hello world!');
});
app.get('/audio',function(req,res){
res.sendFile(__dirname+'/audio.amr');
});
app.post('/upload',function(req,res){
chunks=[];
req.on('data',function(chunk){
chunks.push(chunk);
});
req.on('end',function(){
var data=Buffer.concat(chunks);
fs.writeFile(path,data,'binary',function(err){
if(err)
console.log('couldnt make file'+err);
else{
console.log("Audio Recieved:");
console.log(data);
}
});
});
});
我测试过。运行了 我不知道管理员是否会看到此消息，但是当我回答文本时，我有点不知所措，总是向上和向下查看，为什么不直接使用可编辑的内容？