如何將音頻數據從Java Applet發送到Rails控制器

Question

我必須將字節數組中的音頻數據通過從客戶端的java applet錄製到控制器上的rails服務器來獲取以進行保存。

所以，在applet端使用什麼編碼參數，以什麼形式將音頻數據轉換爲字符串或字節數組，以便導軌正確接收數據，然後我可以將該數據保存在文件中的導軌上。由於目前由軌道控制器製作的音頻文件沒有播放。它是以下錯誤：

LAVF_header: av_open_input_stream() failed 

while playing with the mplayer。

下面是使用在即時通訊從音頻文件中讀取的音頻數據的Java代碼示例IM：

package networksocket; 

import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.swing.JApplet; 
import java.net.*; 
import java.io.*; 
import java.awt.event.*; 
import java.awt.*; 
import java.sql.*; 
import javax.swing.*; 
import javax.swing.border.*; 
import java.awt.*; 
import java.util.Properties; 
import javax.swing.plaf.basic.BasicSplitPaneUI.BasicHorizontalLayoutManager; 
import sun.awt.HorizBagLayout; 
import sun.awt.VerticalBagLayout; 
import sun.misc.BASE64Encoder; 
/** 
* 
    * @author mukand 
*/ 
public class Urlconnection extends JApplet implements ActionListener 
{ 

/** 
* Initialization method that will be called after the applet is loaded 
* into the browser. 
*/ 


public BufferedInputStream in; 
public BufferedOutputStream out; 
public String line; 
public FileOutputStream file; 
public int bytesread; 
public int toread=1024; 
byte b[]= new byte[toread]; 
public String f="FINISH"; 
public String match; 
public File fileopen; 
public JTextArea jTextArea; 
public Button refreshButton; 
public HttpURLConnection urlConn; 
public URL url; 
OutputStreamWriter wr; 
BufferedReader rd; 

@Override 
public void init() { 
    // TODO start asynchronous download of heavy resources 
    //textField= new TextField("START"); 
    //getContentPane().add(textField); 
    JPanel p = new JPanel(); 
    jTextArea= new JTextArea(1500,1500); 
    p.setLayout(new GridLayout(1,1, 1,1)); 
    p.add(new JLabel("Server Details")); 
    p.add(jTextArea); 
    Container content = getContentPane(); 
    content.setLayout(new GridBagLayout()); // Used to center the panel 
    content.add(p); 
    jTextArea.setLineWrap(true); 

    refreshButton = new java.awt.Button("Refresh"); 
    refreshButton.reshape(287,49,71,23); 
    refreshButton.setFont(new Font("Dialog", Font.PLAIN, 12)); 
    refreshButton.addActionListener(this); 
    add(refreshButton); 
    Properties properties = System.getProperties(); 
    properties.put("http.proxyHost", "netmon.iitb.ac.in"); 
    properties.put("http.proxyPort", "80"); 

} 
@Override 
public void actionPerformed(ActionEvent e) 
{ 
    try 
    { 
     url = new URL("http://localhost:3000/audio/audiorecieve"); 
     urlConn = (HttpURLConnection)url.openConnection(); 
     //String login = "mukandagarwal:rammstein$"; 
     //String encodedLogin = new BASE64Encoder().encodeBuffer(login.getBytes()); 
     //urlConn.setRequestProperty("Proxy-Authorization",login); 
     urlConn.setRequestMethod("POST"); 

     // urlConn.setRequestProperty("Content-Type", 
     //"application/octet-stream"); 
     //urlConn.setRequestProperty("Content-Type","audio/mpeg");//"application/x-www- form-urlencoded"); 
     //urlConn.setRequestProperty("Content-Type","application/x-www- form-urlencoded"); 
     //urlConn.setRequestProperty("Content-Length", "" + 
      // Integer.toString(urlParameters.getBytes().length)); 
     urlConn.setRequestProperty("Content-Language", "UTF-8"); 
     urlConn.setDoOutput(true); 
     urlConn.setDoInput(true); 
     byte bread[]=new byte[2048]; 
     int iread; 
     char c; 
     String data=URLEncoder.encode("key1", "UTF-8")+ "="; 
     //String data="key1="; 
     FileInputStream fileread= new FileInputStream("//home//mukand//Hellion.ogg");//Dogs.mp3");//Desktop//mausam1.mp3"); 
     while((iread=fileread.read(bread))!=-1) 
     { 
      //data+=(new String()); 
      /*for(int i=0;i<iread;i++) 
      { 
       //c=(char)bread[i]; 
       System.out.println(bread[i]); 

      }*/ 
      data+= URLEncoder.encode(new String(bread,iread), "UTF-8");//new String(new String(bread));// 
     // data+=new String(bread,iread); 
     } 
     //urlConn.setRequestProperty("Content-Length",Integer.toString(data.getBytes().length)); 
     System.out.println(data); 
     //data+=URLEncoder.encode("mukand", "UTF-8"); 
     //data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8"); 
     //data="key1="; 
     wr = new OutputStreamWriter(urlConn.getOutputStream());//urlConn.getOutputStream(); 
     //if((iread=fileread.read(bread))!=-1) 
      // wr.write(bread,0,iread); 
     wr.write(data); 
     wr.flush(); 

     fileread.close(); 
     jTextArea.append("Send"); 

     // Get the response 
     rd = new BufferedReader(new InputStreamReader(urlConn.getInputStream())); 
     while ((line = rd.readLine()) != null) { 
      jTextArea.append(line); 
     } 
     wr.close(); 
     rd.close(); 
      //jTextArea.append("click"); 

    } 
    catch (MalformedURLException ex) { 
     Logger.getLogger(Urlconnection.class.getName()).log(Level.SEVERE, null, ex); 
    } 
    catch (IOException ex) { 
      Logger.getLogger(Urlconnection.class.getName()).log(Level.SEVERE, null, ex); 
     } 

} 
@Override 
public void start() 
{ 
} 

@Override 
public void stop() 
{ 

} 
@Override 
public void destroy() 
{ 

} 

// TODO overwrite start(), stop() and destroy() methods 

} 

這裏是recieving Rails的控制器功能：

def audiorecieve 
puts "///////////////////////////////////////******RECIEVED*******////" 
puts params[:key1]#+" "+params[:key2] 
data=params[:key1] 
#request.env('RAW_POST_DATA') 
file=File.new("audiodata.ogg", 'w') 
file.write(data) 
file.flush 
file.close 
puts "////**************DONE***********//////////////////////" 
end 

請儘快答覆

Answer 1

Base64對數據進行編碼。將它作爲字符串發送，在Rails端接收並將其解碼回原始格式。