Question

我必须通过从客户端的java applet记录到控制器上的rails服务器来获取字节数组中的音频数据，以便保存。

那么，applet端使用什么编码参数以及以什么形式转换音频数据，如String或字节数组，以便rails正确接收数据，然后我可以将数据保存在文件中的rails。目前由rails控制器制作的音频文件没有播放。这是以下错误：

  LAVF_header: av_open_input_stream() failed

在玩mplayer时。

以下是我正在使用的Java代码示例，其中我从音频文件中读取音频数据：

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

}

以下是用于接收的Rails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

请快速回复

Answer 1

Base64对数据进行编码。将其作为字符串发送，在Rails端接收并将其解码回原始格式。

如何将音频数据从Java Applet发送到Rails控制器

1 个答案: