将inputstream转化为数组byte[]

come on code：

/**
	   * 得到图片字节流 数组大小
	   * */
	  public static byte[] readStream(InputStream inStream) throws Exception{	
	    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
	    byte[] buffer = new byte[1024];	  
	    int len = -1;	
	    while((len = inStream.read(buffer)) != -1){	  
	      outStream.write(buffer, 0, len);	  
	    }	  
	    outStream.close();	  
	    inStream.close();
	    return outStream.toByteArray();	  
	  }