Java Serialization Introduction
What you need to know before this learning.
- You should have learned and understood everything under Java Basic.
- Whenever an java object is to be sent over the network, and moreover if the state of an object is to be saved, java objects need to be serialized.
- With Serializing we mean to convert a java object to a stream of data. It is also known as a marshalling process.
- A serialized object contains the information necessary to deserialize or unmarshal, the object.
- The java.io.ObjectOutputStream and java.io.ObjectInputStream classes are used to write and read objects on any type of existing I/O streams.
How to serialize java object to a file:
To write a serialized java object to a file, create an
from a java.io.FileOutputStream.
(The data in the file is in a proprietary Java format, so it will be difficult for you to read it)
// Serialize today’s date to a file. java.io.FileOutputStream f = new java.io.FileOutputStream("tmp"); java.io.ObjectOutputStream s = new java.io.ObjectOutputStream(f); s.writeObject("Today"); s.writeObject(new Date()); s.flush();
How to serialize java object to another Java program:
To write a serialized java object to another Java program, retrieve the
java.io.OutputStream from a
and create the java.io.ObjectOutputStream from that.
(The other Java program will re-create the object when reading it)
Socket socket = new Socket("someHost", 2201); OutputStream OutStream = socket.getOutputStream(); java.io.ObjectOutputStream stream = new java.io.ObjectOutputStream(OutStream); stream.writeObject("Today"); stream.writeObject(new java.util.Date()); stream.flush();
How to serialize java object to a byte array:
To write a serialized java object to a byte array, create a
java.io.ByteArrayOutputStream and wrap an
java.io.ObjectOutputStream around it.
(This array could then be stored in a DBMS)
java.io.ByteArrayOutputStream bstream= new java.io.ByteArrayOutputStream(); java.io.ObjectOutputStream st = new java.io.ObjectOutputStream(bstream); st.writeObject("This is a test string"); st.flush(); byte bytes=bstream.toByteArray();
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