java.io.Serializable Sample

Employee.java

package seq;

public class Employee {

	public String name;
	public int age;

}

Employee_seq.java

package seq;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

//A no-arg constructor must be accessible to the subclass that is serializable.
//序列化必须是没有参数的构造函数，因此要在对象外部进行赋值
//需要重写readObject和writeObject方法
public class Employee_seq extends Employee implements Serializable {

	private static final long serialVersionUID = 1L;

	private void writeObject(ObjectOutputStream o) throws IOException {
		o.writeObject(this.name);
		o.writeObject(this.age);
	}

	private void readObject(ObjectInputStream o) throws IOException, ClassNotFoundException {
		this.name = (String) o.readObject();
		this.age = (int) o.readObject();
	}
}

Main.java

package seq;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println("hello!");
		Employee_seq e = new Employee_seq();
		e.name = "hello";
		e.age = 12;
		try {
			FileOutputStream fileOut = new FileOutputStream("/tmp/employee.ser");
			ObjectOutputStream out = new ObjectOutputStream(fileOut);
			out.writeObject(e);
			out.flush();
			out.close();
			fileOut.close();
			System.out.println("Serialized data is saved in /tmp/employee.ser");
		} catch (IOException i) {
			i.printStackTrace();
		}
		// 反序列化
		Employee_seq f = null;
		try {
			FileInputStream fileIn = new FileInputStream("/tmp/employee.ser");
			ObjectInputStream in = new ObjectInputStream(fileIn);
			// 该readObject要求构造函数必需是无参数的。否则readobject no valid constructor
			f = (Employee_seq) in.readObject();
			in.close();
			fileIn.close();
		} catch (IOException i) {
			i.printStackTrace();
			return;
		} catch (ClassNotFoundException c) {
			System.out.println("Employee class not found");
			c.printStackTrace();
			return;
		}
		System.out.println("Deserialized Employee...");
		System.out.println("Name: " + f.name);
		System.out.println("Age: " + f.age);
	}

}

result.txt

hello!
Serialized data is saved in /tmp/employee.ser
Deserialized Employee...
Name: hello
Age: 12