这个跟大佬的js有点不一样，我在里面加了一点东西，而且在这个js里面引入了两个另外的js，lame.min.js和worker-realtime.js，这俩在大佬的代码里有

页面：

 
 


开始对讲
关闭对讲




 
recordmp3.js

(function (exports) {

 var MP3Recorder = function (config) {

  var recorder = this;
  config = config || {};
  config.sampleRate = config.sampleRate || 44100;
  config.bitRate = config.bitRate || 128;

  navigator.getUserMedia = navigator.getUserMedia ||
   navigator.webkitGetUserMedia ||
   navigator.mozGetUserMedia ||
   navigator.msGetUserMedia;

  if (navigator.getUserMedia) {
   navigator.getUserMedia({
     audio: true
    },
    function (stream) {
     var context = new AudioContext(),
      microphone = context.createMediaStreamSource(stream),
      processor = context.createScriptProcessor(16384, 1, 1),//bufferSize大小，输入channel数，输出channel数
      mp3ReceiveSuccess, currentErrorCallback;

     var height = 100;
     var width = 400;

     const analyser = context.createAnalyser()
     analyser.fftSize = 1024
     //连接到音频源
     microphone.connect(analyser);
     analyser.connect(context.destination);

     const bufferLength = analyser.frequencyBinCount // 返回的是 analyser的fftsize的一半
     const dataArray = new Uint8Array(bufferLength);

     function draw() {
      canvasCtx.clearRect(0, 0, width, height); //清除画布
      analyser.getByteFrequencyData(dataArray); // 将当前频率数据复制到传入其中的Uint8Array
      const requestAnimFrame = window.requestAnimationFrame(draw) || window.webkitRequestAnimationFrame(draw);
      canvasCtx.fillStyle = '#000130';
      canvasCtx.fillRect(0, 0, width, height);
      let barWidth = (width / bufferLength) * 2;
      let barHeight;
      let x = 0;
      let c = 2
      for (let i = 0; i 

后端websocket：

这里实现的是保存为mp3文件

package com.jetosend.common.socket;

import com.jetosend.common.utils.Utils;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.*;
import java.nio.ByteBuffer;
import java.util.Hashtable;
import java.util.Map;

@ServerEndpoint("/send/{key}")
@Component
public class ServerSocket {

 private static final Map connections = new Hashtable();
 ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

 /***
  * @Description:打开连接
  * @Param: [id, 保存对方平台的资源编码
  * session]
  * @Return: void
  * @Author: Liting
  * @Date: 2019-10-10 09:22
  */
 @OnOpen
 public void onOpen(@PathParam("key") String id, Session session) {
  System.out.println(id + "连上了");
  connections.put(id, session);
 }

 /**
  * 接收消息
  */
 @OnMessage
 public void onMessage(@PathParam("key") String id, InputStream inputStream) {
  System.out.println("来自" + id);
  try {
   int rc = 0;
   byte[] buff = new byte[100];
   while ((rc = inputStream.read(buff, 0, 100)) > 0) {
    byteArrayOutputStream.write(buff, 0, rc);
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 /**
  * 异常处理
  *
  * @param throwable
  */
 @OnError
 public void onError(Throwable throwable) {
  throwable.printStackTrace();
  //TODO 日志打印异常
 }

 /**
  * 关闭连接
  */
 @OnClose
 public void onClose(@PathParam("key") String id) {
  System.out.println(id + "断开");
  BufferedOutputStream bos = null;
  FileOutputStream fos = null;
  File file = null;
  try {
   file = new File("D:testtest.mp3");

   //输出流
   fos = new FileOutputStream(file);

   //缓冲流
   bos = new BufferedOutputStream(fos);

   //将字节数组写出
   bos.write(byteArrayOutputStream.toByteArray());
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   if (bos != null) {
    try {
     bos.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
   if (fos != null) {
    try {
     fos.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }

  connections.remove(id);
 }

实现效果：
 
总结
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