Java Serializable序列化接口

    在这里就简单的说一下Serializable接口，主要是在使用Findbugs插件来检查代码bug时，发现大篇幅的报Non-transient non-serializable instance field in serializable class错误。在仔细研究了下后，找到了解决方法，在这里分享一下

结论：
      1、如果要可序列化某个类，需要实现Serializable接口
      2、为确保序列化与反序列化一致，UID必须不可改变
      3、如果不需要序列化成员变量，那么可以将这个变量标为瞬时的，修饰符:transient
     4、如果需要序列化成员变量的引用，那么这个引用也需要实Serializable接口

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
/**
 * 本例子是将一个类持久化到硬盘中，然后再反序列化出这个对象。
 * 当然如果需要在网络上传输的对象，也需要实现Serializable接口，比如RMI远程方法调用
 */
public class TestSerializable
{
	//对象持久化地址
	private final static String FILE_PATH = "D://student";
	
	public static void main(String[] args)
	{
		writeObj();

		readObj();
	}
	
	//将对象持久化到硬盘
	public static void writeObj()
	{
		ObjectOutputStream oos = null;
		FileOutputStream fos = null;
		try
		{
			Student stu1 = new Student(17, "Tom", new Point(108, 230));
			System.out.println("stu1: " + stu1);
			fos = new FileOutputStream(FILE_PATH);
			oos = new ObjectOutputStream(fos);
			oos.writeObject(stu1);
			oos.flush();
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		finally
		{
			if (oos != null)
			{
				try
				{
					oos.close();
				}
				catch (IOException e)
				{
					e.printStackTrace();
				}
			}
			if (fos != null)
			{
				try
				{
					fos.close();
				}
				catch (IOException e)
				{
					e.printStackTrace();
				}
			}

		}
	}
	
	//反序列持久化对象
	public static void readObj()
	{
		FileInputStream fis = null;
		ObjectInputStream ois = null;
		try
		{
			Student stu2 = null;
			fis = new FileInputStream(FILE_PATH);
			ois = new ObjectInputStream(fis);
			Object obj = ois.readObject();
			stu2 = (Student) obj;
			System.out.println("stu2: " + stu2);
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		catch (ClassNotFoundException e)
		{
			e.printStackTrace();
		}
		finally
		{	
			if(ois != null)
			{
				try
				{
					ois.close();
				}
				catch (IOException e)
				{
					e.printStackTrace();
				}
			}
			if(fis != null)
			{
				try
				{
					fis.close();
				}
				catch (IOException e)
				{
					e.printStackTrace();
				}
			}
		}
	}
}

//如果要可序列化某个类，需要实现Serializable接口
class Student implements Serializable
{
	//为确保序列化与反序列化一致，UID必须不可改变
	private static final long serialVersionUID = 1L;

	private String name;
	
	private int age;
	//如果不需要序列化成员变量，那么可以将这个变量标为瞬时的，修饰符:transient
	//private transient Point point;
	//如果需要序列化成员变量的引用，那么这个引用也需要实Serializable接口
	private Point point;

	public Student(int age, String name, Point point)
	{
		this.age = age;
		this.name = name;
		this.point = point;
	}

	public String getName()
	{
		return name;
	}

	public void setName(String name)
	{
		this.name = name;
	}

	public int getAge()
	{
		return age;
	}

	public void setAge(int age)
	{
		this.age = age;
	}

	public Point getPoint()
	{
		return point;
	}

	public void setPoint(Point point)
	{
		this.point = point;
	}

	@Override
	public String toString()
	{
		return "name=" + this.getName() + ", age=" + this.getAge() + ", point{"
				+ this.getPoint() + "}";
	}

}

class Point implements Serializable
{
	private static final long serialVersionUID = 1L;

	private int x;
	private int y;

	public Point(int x, int y)
	{
		super();
		this.x = x;
		this.y = y;
	}

	public int getX()
	{
		return x;
	}

	public void setX(int x)
	{
		this.x = x;
	}

	public int getY()
	{
		return y;
	}

	public void setY(int y)
	{
		this.y = y;
	}

	@Override
	public String toString()
	{
		return "x=" + x + ", y=" + y;
	}

}