将Blob转换为字节数组的最简单方法

mySql blob类具有以下功能：

blob.getBytes

像这样使用它：

//(assuming you have a ResultSet named RS)Blob blob = rs.getBlob("SomeDatabaseField");int blobLength = (int) blob.length();  byte[] blobAsBytes = blob.getBytes(1, blobLength);//release the blob and free up memory. (since JDBC 4.0)blob.free();