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[英]FileNotFoundException: Playing an mp3 file with Java/Eclipse
[英]Write mp3 file to disk while playing in Java
我有一个应用程序,使用JLayer / BasicPlayer库通过HTTP播放远程MP3文件。 我想将播放的mp3文件保存到磁盘,而无需重新下载它们。
这是使用基于JLayer的BasicPlayer播放MP3文件的代码。
String mp3Url = "http://ia600402.us.archive.org/6/items/Stockfinster.-DeadLinesutemos025/01_Push_Push.mp3";
URL url = new URL(mp3Url);
URLConnection conn = url.openConnection();
InputStream is = conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
BasicPlayer player = new BasicPlayer();
player.open(bis);
player.play();
如何将mp3文件保存到磁盘?
为避免两次遍历字节,您需要将来自连接的输入流包装在过滤器中,该过滤器会将读取的所有数据写入输出流,即一种“三通管道输入流”。 这样的类并不难编写,但是您可以通过使用Apache Commons IO库中的TeeInputStream
来保存工作。
Apache Commons IO: http : //commons.apache.org/io/
TeeInputStream javadoc: http ://commons.apache.org/io/apidocs/org/apache/commons/io/input/TeeInputStream.html
编辑:概念验证:
import java.io.*;
public class TeeInputStream extends InputStream {
private InputStream in;
private OutputStream out;
public TeeInputStream(InputStream in, OutputStream branch) {
this.in=in;
this.out=branch;
}
public int read() throws IOException {
int read = in.read();
if (read != -1) out.write(read);
return read;
}
public void close() throws IOException {
in.close();
out.close();
}
}
如何使用它:
...
BufferedInputStream bis = new BufferedInputStream(is);
TeeInputStream tis = new TeeInputStream(bis,new FileOutputStream("test.mp3"));
BasicPlayer player = new BasicPlayer();
player.open(tis);
player.play();
BufferedInputStream in = new BufferedInputStream(is);
OutputStream out = new BufferedOutputStream(new FileOutputStream(new File(savePathAndFilename)));
byte[] buf = new byte[256];
int n = 0;
while ((n=in.read(buf))>=0) {
out.write(buf, 0, n);
}
out.flush();
out.close();
您可以首先使用FileInputStream
将流写入磁盘。 然后从文件重新加载流。
包装你自己的InputStream
class myInputStream extends InputStream {
private InputStream is;
private FileOutputStream resFile;
public myInputStream(InputStream is) throws FileNotFoundException {
this.is = is;
resFile = new FileOutputStream("path_to_result_file");
}
@Override
public int read() throws IOException {
int b = is.read();
if (b != -1)
resFile.write(b);
return b;
}
@Override
public void close() {
try {
resFile.close();
} catch (IOException ex) {
}
try {
is.close();
} catch (IOException ex) {
}
}
}
并使用
InputStream is = conn.getInputStream();
myInputStream myIs = new myInputStream(is);
BufferedInputStream bis = new BufferedInputStream(myIs);
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