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

 1 package com.zyjhandsome.io;
 2 
 3 import java.io.*;
 4 
 5 public class TestObjectIO {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         T t = new T();
10         t.k = 8;
11 
12         try {
13             FileOutputStream fos = new FileOutputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
14             ObjectOutputStream oos = new ObjectOutputStream(fos);
15             oos.writeObject(t);
16             oos.flush();
17             oos.close();
18             
19             FileInputStream fis = new FileInputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
20             ObjectInputStream ois = new ObjectInputStream(fis);
21             try {
22                 T tReaded = (T)ois.readObject();
23                 System.out.println(tReaded.i + " + " + tReaded.j + " + " + tReaded.d + " + " + tReaded.k + " = ");
24                 System.out.println(tReaded.i + tReaded.j + tReaded.d + tReaded.k);
25                 
26             } catch (ClassNotFoundException e) {
27                 // TODO Auto-generated catch block
28                 e.printStackTrace();
29             }            
30         } catch (IOException e) {
31             // TODO Auto-generated catch block
32             e.printStackTrace();
33         }        
34     }
35 }
36 
37 class T implements Serializable
38 {
39     int i = 10;
40     int j = 9;
41     double d = 2.3;
42     int k = 15;
43 }

　　输出结果：

1 10 + 9 + 2.3 + 8 = 
2 29.3

　　结合transient关键字使用：

 1 package com.zyjhandsome.io;
 2 
 3 import java.io.*;
 4 
 5 public class TestObjectIO {
 6 
 7     public static void main(String[] args) {
 8         // TODO Auto-generated method stub
 9         T t = new T();
10         t.k = 8;
11 
12         try {
13             FileOutputStream fos = new FileOutputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
14             ObjectOutputStream oos = new ObjectOutputStream(fos);
15             oos.writeObject(t);
16             oos.flush();
17             oos.close();
18             
19             FileInputStream fis = new FileInputStream("D:\zhaoyingjun\else\Test\TestObjectIO.log");
20             ObjectInputStream ois = new ObjectInputStream(fis);
21             try {
22                 T tReaded = (T)ois.readObject();
23                 System.out.println(tReaded.i + " + " + tReaded.j + " + " + tReaded.d + " + " + tReaded.k + " = ");
24                 System.out.println(tReaded.i + tReaded.j + tReaded.d + tReaded.k);
25                 
26             } catch (ClassNotFoundException e) {
27                 // TODO Auto-generated catch block
28                 e.printStackTrace();
29             }            
30         } catch (IOException e) {
31             // TODO Auto-generated catch block
32             e.printStackTrace();
33         }        
34     }
35 }
36 
37 class T implements Serializable
38 {
39     int i = 10;
40     int j = 9;
41     double d = 2.3;
42     transient int k = 15;
43 }

　　输出结果：

1 10 + 9 + 2.3 + 0 = 
2 21.3