/**
 * @author why
 *
 */
public class VoiceDownload {
 /**
 * 
 * 依据文件id下载文件
 * 
 * 
 * 
 * @param mediaId
 * 
 *   媒体id
 * 
 * @throws Exception
 */

 public static InputStream getInputStream(String accessToken, String mediaId) {
 InputStream is = null;
 String url = "http://file.api.weixin.qq.com/cgi-bin/media/get?
access_token="
 + accessToken + "&media_id=" + mediaId;
 try {
 URL urlGet = new URL(url);
 HttpURLConnection http = (HttpURLConnection) urlGet
  .openConnection();
 http.setRequestMethod("GET"); // 必须是get方式请求
 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;

 }

 /**
 * 
 * 获取下载图片信息（jpg）
 * 
 * 
 * 
 * @param mediaId
 * 
 *   文件的id
 * 
 * @throws Exception
 */

 public static void saveImageToDisk(String accessToken, String mediaId, String picName, String picPath)
 throws Exception {
 InputStream inputStream = getInputStream(accessToken, mediaId);
 byte[] data = new byte[10240];
 int len = 0;
 FileOutputStream fileOutputStream = null;
 try {
 fileOutputStream = new FileOutputStream(picPath+picName+".amr");
 while ((len = inputStream.read(data)) != -1) {
 fileOutputStream.write(data, 0, len);
 }
 } catch (IOException e) {
 e.printStackTrace();
 } finally {
 if (inputStream != null) {
 try {
  inputStream.close();
 } catch (IOException e) {
  e.printStackTrace();
 }
 }
 if (fileOutputStream != null) {
 try {
  fileOutputStream.close();
 } catch (IOException e) {
  e.printStackTrace();
 }
 }
 }
 }

}