Here you can find the source of getBytes(Object v, byte[] defaultValue)
public static byte[] getBytes(Object v, byte[] defaultValue)
//package com.java2s; /******************************************************************************* * Copyright 2007-2013 See AUTHORS file./*from w w w . ja v a 2 s . co m*/ * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. ******************************************************************************/ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; public class Main { public static final String VALUE_BLANK = ""; public static byte[] getBytes(Object v, byte[] defaultValue) { if (v == null || VALUE_BLANK.equals(v)) { return null; } else if (v instanceof byte[]) { return (byte[]) v; } else if (v instanceof java.io.Serializable) { ByteArrayOutputStream bout = new ByteArrayOutputStream(); ObjectOutputStream oout; try { oout = new ObjectOutputStream(bout); oout.writeObject(v); } catch (IOException e) { } return bout.toByteArray(); } return defaultValue; } }