Java serialization and deserialization

Java serialization and deserialization
Basic concepts:
Serialization is the process of converting the object state to a format that can be maintained or transmitted. In contrast to serialization, deserialization converts a stream into an object. These two processes can be combined to easily store and transmit data.


It is particularly important in network transmission. We can serialize a class and then get the object through deserialization at the other end.


For example, we can serialize an object, but this object must implement a serialization method and generate a serialization number.

This is the process of serializing and deserializing an object:

public static byte[] serializeObj(Object object){if (object == null) {throw new NullPointerException("Can't serialize null");}byte[] rv = null;ByteArrayOutputStream bos = null;ObjectOutputStream os = null;try {bos = new ByteArrayOutputStream();os = new ObjectOutputStream(bos);os.writeObject(object);os.writeObject(null);os.close();bos.close();rv = bos.toByteArray();} catch (IOException e) {throw new IllegalArgumentException("Non-serializable object", e);} finally {try {if (os != null) {os.flush();os.close();}if (bos != null) {bos.flush();bos.close();}} catch (IOException e) {e.printStackTrace();}}return rv;}@SuppressWarnings("unchecked")public static <T>T deserializeObj(byte[] in,Class<T> clazz) {ByteArrayInputStream bis = null;ObjectInputStream is = null;try {if (in != null) {bis = new ByteArrayInputStream(in);is = new ObjectInputStream(bis);while (true) {T o = (T) is.readObject();if (o == null) {break;} else {return o;}}}} catch (IOException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();} finally {try {if (is != null) {is.close();}if (bis != null) {bis.close();}} catch (IOException e) {e.printStackTrace();}}return null;}

Below is an extension (serialization and deserialization of sets ):

public static <T>byte[] serializeList(List<T> value ,Class<T> clazz) {if (value == null) {throw new NullPointerException("Can't serialize null");}byte[] rv = null;ByteArrayOutputStream bos = null;ObjectOutputStream os = null;try {bos = new ByteArrayOutputStream();os = new ObjectOutputStream(bos);for (T t : value) {os.writeObject(t);}os.writeObject(null);os.close();bos.close();rv = bos.toByteArray();} catch (IOException e) {throw new IllegalArgumentException("Non-serializable object", e);} finally {try {if (os != null) {os.flush();os.close();}if (bos != null) {bos.flush();bos.close();}} catch (IOException e) {e.printStackTrace();}}return rv;}@SuppressWarnings("unchecked")public static <T> List<T> deserializeList(byte[] in,Class<T> clazz) {List<T> list = new ArrayList<T>();ByteArrayInputStream bis = null;ObjectInputStream is = null;try {if (in != null) {bis = new ByteArrayInputStream(in);is = new ObjectInputStream(bis);while (true) {T o = (T) is.readObject();if (o == null) {break;} else {list.add(o);}}}} catch (IOException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();} finally {try {if (is != null) {is.close();}if (bis != null) {bis.close();}} catch (IOException e) {e.printStackTrace();}}