//加了了Optional防止空指標異常,加入了泛型,省去了強制轉化

import java.io.*;
import java.util.Optional;
/**
 * Created by Jason on 2017/1/3.
 */
public class ByteArrayUtils {

    public static<T> Optional<byte[]> objectToBytes(T obj){
        byte[] bytes = null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
 
ObjectOutputStream sOut;
        try {
            sOut = new ObjectOutputStream(out);
sOut.writeObject(obj);
sOut.flush();
bytes= out.toByteArray();
} catch (IOException e) {
            e.printStackTrace();
}
        return Optional.ofNullable(bytes);
}

    public static<T> Optional<T> bytesToObject
 
(byte[] bytes) {
        T t = null;
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
ObjectInputStream sIn;
        try {
            sIn = new ObjectInputStream(in);
t = (T)sIn.readObject();
} catch (Exception e) {
            e.printStackTrace();
}
        return Optional.ofNullable(t);
 
}
}