读取MySQL存储二进制的语音、图片(Blob类型)

/**   * 下载语音   * Remarks：   * @throws Exception   */

public void downloadYuyin() throws Exception {

String voiceId = getRequest().getParameter("voiceId");

InputStream inputStream = voiceService.findInputByVoiceId(voiceId);

String realPath1 = getRequest().getRealPath("/") + "/upload/voice.pttly";

File f2 = new File(realPath1);   FileOutputStream dos = new FileOutputStream(f2);  // 生成带缓冲区的二进制 写入流

OutputStream dosss = new DataOutputStream(new BufferedOutputStream(  new FileOutputStream(f2)));

// 创建文件读取缓冲区

byte[] buf = new byte[2048];

// 读进 缓冲区    dos.write(toByteArray(inputStream));

// 把文件数据写入文件

dos.close();//关闭流

String realPath = getRequest().getRealPath("/") + "/upload/voice.pttly";

File file = new File(realPath);

String filename = file.getName();

InputStream fis = new BufferedInputStream(new FileInputStream(     realPath));

byte[] buffer = new byte[fis.available()];   fis.read(buffer);   fis.close();   // 清空

response   getResponse().reset();

// 设置response的Header

getResponse().addHeader("Content-Disposition", "attachment;

filename="+ new String(filename.getBytes()));

//getResponse().addHeader("Content-Disposition", "attachment;filename="+"yuyin.pttly");

getResponse().addHeader("Content-Length", "" + file.length());

OutputStream toClient = new BufferedOutputStream(getResponse()     .getOutputStream());

getResponse().setContentType("application/octet-stream");

toClient.write(buffer);

toClient.flush();

toClient.close();

}

//service

public InputStream findInputByVoiceId(String voiceId) {
  return voiceDao.findInputByVoiceId(voiceId);
 }

//dao

@SuppressWarnings("rawtypes")
 public InputStream findInputByVoiceId(String voiceId) {
  String sql = "SELECT voice_id,call_user_id,group_id,UnitId,participate_user_id,call_type,starttime,endtime,voicedata FROM Voice_Info WHERE voice_id="+voiceId;
  SQLQuery sqlQuery = createSQLQuery(sql.toString());
  List lists = sqlQuery.list();
  InputStream input = null;
  for(int i=0;i<lists.size();i++){
   Object[] objects=(Object[])lists.get(0);
   if(objects != null){
    SerializableBlob o = (SerializableBlob) objects[8];
    try {
     input = o.getBinaryStream();
    } catch (SQLException e) {
     e.printStackTrace();
    }
   }
  }
  return input;
 }