Serializable与transient的联合使用：动态管理成员属性——《Thinking in Java》随笔033

//: SerialCtl.java
// 下面这个Demo演示如何使用Serializable和transient关键字来动态管理成员属性
// 主要思想是添加（不是复写与实现）write与read的方法（注意方法签名）

package c10;

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

/**
*    @time:         上午10:01:53
*    @date:         2017年5月11日
*    @auther:    skyfffire
*    @version:    v0.1
*/
public class SerialCtl implements Serializable {
    private static final long serialVersionUID = -7532371062424412783L;

    String a = null;
    transient String b = null;
    
    public SerialCtl(String aa, String bb) {
        a = "Not Transient: " + aa;
        b = "Transient: " + bb;
    }
    
    public String toString() {
        return a + "\n" + b;
    }
    
    private void writeObject(ObjectOutputStream stream) 
            throws IOException {
        stream.defaultWriteObject();
        stream.writeObject(b);
    }
    
    private void readObject(ObjectInputStream stream) 
            throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        b = (String) stream.readObject();
    }
    
    public static void main(String[] args) {
        SerialCtl sc = new SerialCtl("Test1", "Test2");
        
        System.out.println("Before:\n" + sc);
        
        ByteArrayOutputStream buf = 
                new ByteArrayOutputStream();

        try {
            ObjectOutputStream o = new ObjectOutputStream(buf);
            o.writeObject(sc);
            o.close();
            
            ObjectInputStream in = 
                    new ObjectInputStream(
                            new ByteArrayInputStream(buf.toByteArray()));
            sc = (SerialCtl) in.readObject();
            in.close();
            System.out.println(sc);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

///:~