Java オブジェクト ストリーム、オブジェクトの永続ストレージ

出力ストリーム

package com.test.file;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class TestObjectOutputStream {
    
    

	/**
	 * @param args
	 */
	public static void main(String[] args) {
    
    
		// TODO Auto-generated method stub

		//写出一个对象 (序列化对象)
		
		//对象输出流的使用
		File file=new File("/Users/yangjunbo/kaifa/Test/person.data");
		
		//创建对象输出流
		FileOutputStream fileOutputStream;
		try {
    
    
			
			fileOutputStream = new FileOutputStream(file);
			
			ObjectOutputStream objectOutputStream=new ObjectOutputStream(fileOutputStream);
			
			//创建person对象
			Person person=new Person("yaoming",36);
			
			//写入对象
			objectOutputStream.writeObject(person);
			
			//关闭流
			
			objectOutputStream.close();
			
			fileOutputStream.close();
			
			
			
		} catch (FileNotFoundException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
    
    
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		
		
		
		
		
	}

}

入力ストリーム

package com.test.file;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;


public class TestObjectInputStream {
    
    

	/**
	 * @param args
	 */
	public static void main(String[] args) {
    
    
		// TODO Auto-generated method stub

		//创建对象输入流    读入一个对象(反序列化对象  重构对象)
		
	   File file=new File("/Users/yangjunbo/kaifa/Test/person.data");
	   
	   FileInputStream fileInputStream;
	   
	try {
    
    
		
		fileInputStream = new FileInputStream(file);
		
		ObjectInputStream objectInputStream=new ObjectInputStream(fileInputStream);
		
		Person person=(Person)(objectInputStream.readObject());
		
		System.out.println(person);
		
		objectInputStream.close();
		
		fileInputStream.close();
		
		
		
		
	} catch (FileNotFoundException e) {
    
    
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IOException e) {
    
    
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (ClassNotFoundException e) {
    
    
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	   
	  
		
		
	}

}

人物クラス

package com.test.file;

import java.io.Serializable;

//实现序列化接口 的对象才能写出去
public class Person implements Serializable {
    
    	
	
	//自定义（显示定义）序列号 
	//防止对象序列化以后，类的结构更改了 不能反序列化
	public static final long serialVersionUID=342343423l;
	
	private static String name; //静态变量不会被序列化
	public transient  int age; //加上transient关键字的属性也不会被序列化  transient 瞬态
	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 Person()
	{
    
    }
	
	public Person(String name,int age)
	{
    
    
		this.name=name;
		this.age=age;
	}

	public String toString()
	{
    
    
		return "Person[name="+this.name+",age="+this.age+"]";
	}
}