获取微信公众号临时素材音频并转war格式

绝对亲测好用支持windows和linux

如果linux使用的话需要去ffmpge官网下载工具

第一步：

第二步： 首先选择linux系统

第三步： 选择适合自己的ffmpeg版本

我选择的是这个版本感觉很好用

第四步：安装ffmpeg
把下载下来的安装包放到/usr/local下面执行命令解压就可以了

tar -xvf ffmpeg-3.3.4-64bit-static.tar.xz

进入ffmpeg包

cd ffmpeg-3.3.4-64bit-static

执行命令测试工具是否好用

./ffmpeg -i /home/uploadPath/5c31f4a5-f421-407f-b89f-19c7083bf008.amr /home/uploadPath/123.wav

出现这种代码就是说明转换成功

Java代码

首先前端会传过微信的mediaId直接用这个去微信临时素材库获取音频

 @PostMapping("/downloadVoice")
    public AjaxResult downloadVoice(String mediaId) throws Exception {
        Map<String, Object> map = new HashMap<>();
        System.out.println("mediaId=======:" + mediaId);
        Map<String, String> accessTokenMap = GetAccessTokenUtil.getAccessToken(
                WxPayConfig.appid, WxPayConfig.AppSecret);
        String accessToken = accessTokenMap.get("accessToken");
        System.out.println("accessToken:=========" + accessToken);
        InputStream inputStream = getInputStream(accessToken, mediaId);
        String name = UUID.randomUUID().toString();
        //获取音频要写入的路径
        String fileUrl = "/home/uploadPath/" + DateUtils.getYear() + "/" + DateUtils.getMonth() + "/" + DateUtils.getDay() + "/";
        File f = new File(fileUrl);
        if (!f.exists()) {
            f.mkdir();
        }
        String destination = fileUrl + name + ".amr";
        int index;
        byte[] bytes = new byte[1024];
        FileOutputStream downloadFile = new FileOutputStream(destination);
        while ((index = inputStream.read(bytes)) != -1) {
            downloadFile.write(bytes, 0, index);
            downloadFile.flush();
        }
        inputStream.close();
        downloadFile.close();
        //把amr格式的转换为wav格式并返回历经
        String s = convertAmr2Wav(destination);
        return AjaxResult.success(s);

    }

getInputStream类

自己可以抽成工具类，获取微信临时素材库的音频流

private static InputStream getInputStream(String accessToken, String mediaId) {
        InputStream is = null;
        String url = WxPayConfig.voice_url +
                "?access_token=" + accessToken + "&media_id=" + mediaId;
        try {
            URL urlGet = new URL(url);
            HttpURLConnection http = (HttpURLConnection) urlGet
                    .openConnection();
            http.setRequestMethod("GET"); // 微信要求是get请求方式
            http.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            http.setDoOutput(true);
            http.setDoInput(true);
            System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
            System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
            http.connect();
            // 获取文件转化为byte流
            is = http.getInputStream();

        } catch (Exception e) {
            e.printStackTrace();
        }
        return is;

    }

convertAmr2Wav类

音频转换类，自己可以抽出来，我比较懒，真的是懒得弄，哈哈

//amrFilePath amr的源路径
 private static String convertAmr2Wav(String amrFilePath) {
        File source = new File(amrFilePath);
        String extension = amrFilePath.substring(amrFilePath.lastIndexOf("."));
        String targetFilename = amrFilePath.replace(extension, ".wav");

//获取系统是 windows还是linux
        String os = System.getProperties().getProperty("os.name").toLowerCase();
        if (os.startsWith("win")) {
            File target = new File(targetFilename);
            Encoder encoder = new Encoder();
            EncodingAttributes attrs = new EncodingAttributes();
            attrs.setFormat("wav");
            AudioAttributes audio = new AudioAttributes();
            audio.setCodec("libmp3lame");
            attrs.setAudioAttributes(audio);
            try {
                encoder.encode(source, target, attrs);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else {
        //配置linux ffmpge
            String command = "/usr/local/ffmpeg-3.3.4-64bit-static/ffmpeg -i " + amrFilePath + " " + targetFilename;
            try {
                Runtime.getRuntime().exec(command);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

		//返回转换后的路径
        return targetFilename;
    }