Java 输入/输出——处理流（ObjectIO）

　　Object流：直接将Object流写入或读出。

• TestObjectIO.java
• transient关键字（英文名：透明的，可以用来修饰成员变量（实例变量），transient修饰的成员变量（实例变量）在serializable序列化时不予考虑）
• serializable接口（可以被序列化，属于标记性接口，里面没有定义方法，打标机给编译器看，编译器看到了则认为该类可以被序列化）
• externalizable接口

package com.zyjhandsome.io;

import java.io.*;

public class TestObjectIO {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        T t = new T();
        t.k = 8;

        try {
            FileOutputStream fos = new FileOutputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(t);
            oos.flush();
            oos.close();
            
            FileInputStream fis = new FileInputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
            ObjectInputStream ois = new ObjectInputStream(fis);
            try {
                T tReaded = (T)ois.readObject();
                System.out.println(tReaded.i + " + " + tReaded.j + " + " + tReaded.d + " + " + tReaded.k + " = ");
                System.out.println(tReaded.i + tReaded.j + tReaded.d + tReaded.k);
                
            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }
}

class T implements Serializable
{
    int i = 10;
    int j = 9;
    double d = 2.3;
    int k = 15;
}

　　输出结果：

10 + 9 + 2.3 + 8 = 
29.3

　　结合transient关键字使用：

package com.zyjhandsome.io;

import java.io.*;

public class TestObjectIO {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        T t = new T();
        t.k = 8;

        try {
            FileOutputStream fos = new FileOutputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(t);
            oos.flush();
            oos.close();
            
            FileInputStream fis = new FileInputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
            ObjectInputStream ois = new ObjectInputStream(fis);
            try {
                T tReaded = (T)ois.readObject();
                System.out.println(tReaded.i + " + " + tReaded.j + " + " + tReaded.d + " + " + tReaded.k + " = ");
                System.out.println(tReaded.i + tReaded.j + tReaded.d + tReaded.k);
                
            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }
}

class T implements Serializable
{
    int i = 10;
    int j = 9;
    double d = 2.3;
    transient int k = 15;
}

　　输出结果：

10 + 9 + 2.3 + 0 = 
21.3