ObjectInputStream(反序列化) & ObjectOutputStream（序列化）

1.先寫出後讀取
2.讀取的順序必須保持一致
3.不是所有的物件都能序列化，要加上serializable接口才行

當不想對物件中的某個屬性序列化時，在屬性中新增transient就行啦~
[eg]:private transient String name;

4.序列化有另外一個名稱叫做持久化

(1)序列化到位元組資料（不需要關閉流）

package cn.lesson.Burrfed;

import java.io.BufferedInputStream;
 

import java.io.BufferedOutputStream;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
 

import java.util.Date;


/**
 * 資料流
 * 1.先寫出後讀取
 * 2.讀取和寫出的順序一致
 * 3.不是所有的物件都可以序列化，必須要使用serializable介面
 * @author MacBook
 *
 */
public class DataTest {

	public static void main(String[] args) throws IOException, ClassNotFoundException {
		//選擇流
		ByteArrayOutputStream baos = new ByteArrayOutputStream
 
();
		ObjectOutputStream dos = new ObjectOutputStream(new BufferedOutputStream(baos));
		//寫出
		dos.writeUTF("啦啦啦啦");
		dos.writeInt(12);
		dos.writeBoolean(false);
		dos.writeChar('a');
		
		//物件
		dos.writeObject("誰解其中味");
		dos.writeObject(new Date());
		Employee emp = new Employee("馬雲", 400);
		dos.writeObject(emp);
				
		dos.flush();
		
		byte[] datas = baos.toByteArray();
		System.out.println(datas.length);
		
		//讀取
		
		//選擇流
		ObjectInputStream dis = 
				new ObjectInputStream(
						new BufferedInputStream(
								new ByteArrayInputStream(datas)));
		
		String msg = dis.readUTF();
		int age = dis.readInt();
		boolean i = dis.readBoolean();
		char ch = dis.readChar();
		
		Object str = dis.readObject();
		Object date = dis.readObject();
		Object employee = dis.readObject();
		
		//基本資料型別直接保留，但是引用資料為了型別不轉換錯誤，我們一般要加上這些東西
		if(str instanceof String) {
			String strObj = (String)str;
			System.out.println(strObj);
			
		}
		
		if(date instanceof Date) {
			Date dateObj = (Date)date;
			System.out.println(dateObj);
			
		}
		
		
		if(employee instanceof Employee) {
			Employee empObj = (Employee)employee;
			System.out.println(empObj.getName()+"-->"+empObj.getSalary());
			
		}
		
		
		
		System.out.println(ch);
		
		
	}

}

/**
 * javabean 封裝資料
 * @author MacBook
 *
 */
class Employee implements java.io.Serializable{
	private String name;
	private double salary;
	
	public Employee(String name,double salary){
		this.name=name;
		this.salary=salary;
		
	}

	public String getName() {
		return name;
	}

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

	public double getSalary() {
		return salary;
	}

	public void setSalary(double salary) {
		this.salary = salary;
	}
	
	
}

（2）序列化到檔案中

package cn.lesson.Burrfed;

import java.io.BufferedInputStream;

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


/**
 * 資料流
 * 1.先寫出後讀取
 * 2.讀取和寫出的順序一致
 * 3.不是所有的物件都可以序列化，必須要使用serializable介面
 * @author MacBook
 *
 */
public class DataTest {

	public static void main(String[] args) throws IOException, ClassNotFoundException {
		//選擇流
		
		ObjectOutputStream dos = new ObjectOutputStream(new FileOutputStream("obj.txt"));
		//寫出
		dos.writeUTF("啦啦啦啦");
		dos.writeInt(12);
		dos.writeBoolean(false);
		dos.writeChar('a');
		
		//物件
		dos.writeObject("誰解其中味");
		dos.writeObject(new Date());
		Employee emp = new Employee("馬雲", 400);
		dos.writeObject(emp);
				
		dos.flush();
		dos.close();
		
		//讀取
		
		//選擇流
		ObjectInputStream dis = 
				new ObjectInputStream(
						new BufferedInputStream(
								new FileInputStream("obj.txt")));
		
		String msg = dis.readUTF();
		int age = dis.readInt();
		boolean i = dis.readBoolean();
		char ch = dis.readChar();
		
		Object str = dis.readObject();
		Object date = dis.readObject();
		Object employee = dis.readObject();
		
		//基本資料型別直接保留，但是引用資料為了型別不轉換錯誤，我們一般要加上這些東西
		if(str instanceof String) {
			String strObj = (String)str;
			System.out.println(strObj);
			
		}
		
		if(date instanceof Date) {
			Date dateObj = (Date)date;
			System.out.println(dateObj);
			
		}
		
		
		if(employee instanceof Employee) {
			Employee empObj = (Employee)employee;
			System.out.println(empObj.getName()+"-->"+empObj.getSalary());
			
		}
		
		
		
		dis.close();
		
		
	}

}

/**
 * javabean 封裝資料
 * @author MacBook
 *
 */
class Employee implements java.io.Serializable{
	private transient String name;
	private double salary;
	
	public Employee(String name,double salary){
		this.name=name;
		this.salary=salary;
		
	}

	public String getName() {
		return name;
	}

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

	public double getSalary() {
		return salary;
	}

	public void setSalary(double salary) {
		this.salary = salary;
	}
	
	
}