import java.io.ByteArrayOutputStream; import java.io.InputStream; //从输入流中获取数据并以字节数组返回 public class StreamTool {     /**      * 从输入流获取数据      * @param inputStream      * @return      * @throws Exception      */     public static byte[] readInputStream(InputStream inputStream) throws Exception{         byte[] buffer = new byte[1024];         int len = -1;         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();         while((len = inputStream.read(buffer)) != -1){             outputStream.write(buffer, 0, len);         }         outputStream.close();         inputStream.close();         return outputStream.toByteArray();     } }