微信小程序录音文件格式silk遇到的问题及解决方法

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import com.qcloud.Utilities.Base64;public class Base64Webm { public static void readTxtFile(String filePath) { try { String encoding = "utf-8"; File file = new File(filePath); if (file.isFile() && file.exists()) { // 判断文件是否存在 InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);// 考虑到编码格式 BufferedReader bufferedReader = new BufferedReader(read); StringBuilder lineTxt = new StringBuilder(); String line = null; while ((line = bufferedReader.readLine()) != null) {  lineTxt.append(line); } read.close();  String olddata = lineTxt.toString(); olddata = olddata.replace("data:audio/webm;base64,", ""); System.out.println(olddata);    try {       File webmFile = new File("D://project//liulei//Doc//互动直播室//微课网页开发//silk2mp3//caole.webm");   byte[] bt = Base64.decode(olddata) ;    FileOutputStream in = new FileOutputStream(webmFile);     try {      in.write(bt, 0, bt.length);      in.close();      // boolean success=true;      // System.out.println("写入文件成功");     } catch (IOException e) {      // TODO Auto-generated catch block      e.printStackTrace();     }    } catch (FileNotFoundException e) {     // TODO Auto-generated catch block     e.printStackTrace();    }  } else { System.out.println("找不到指定的文件"); } } catch (Exception e) { System.out.println("读取文件内容出错"); e.printStackTrace(); } }  public static void main(String[] args) { readTxtFile("D://project//liulei//Doc//互动直播室//微课网页开发//silk2mp3//liulie.silk"); }}