Java对象的序列化与反序列化

学习了一下Java对象的序列化与反序列化，下面的代码是一个简单的例子。

Java代码

1. import java.io.File;  
2. import java.io.FileInputStream;  
3. import java.io.FileNotFoundException;  
4. import java.io.FileOutputStream;  
5. import java.io.IOException;  
6. import java.io.ObjectInputStream;  
7. import java.io.ObjectOutputStream;  
8. import java.util.Date;  
9.   
10.   
11. public class sirializableTest implements Serializable  
12. {  
13.     private String username;  
14.     private transient String password;   //不会参与序列化与反序列化的过程  
15.       
16.     public sirializableTest(String username, String password)  
17.      {  
18.         this.username = username;  
19.         this.password = password;  
20.      }  
21.       
22.     public String toString()  
23.      {  
24.         return "username: " + username + ", password: " + password;  
25.      }  
26.       
27.     public static void main(String[] args)  
28.      {         
29.         try   
30.          {  
31.              File f = new File("C:\\a.obj");  
32.             if(!f.exists())  
33.                  f.createNewFile();  
34.               
35.             //序列化对象  
36.              ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(f));  
37.              out.writeObject("Happy New Year !");  
38.              out.writeObject(new Date());  
39.              sirializableTest test = new sirializableTest("yoyo", "20090105");  
40.              out.writeObject(test);  
41.              out.close();  
42.               
43.             //反序列化对象  
44.              ObjectInputStream in = new ObjectInputStream(new FileInputStream(f));  
45.              System.out.println(in.readObject());  //输出：Happy New Year !  
46.              System.out.println(in.readObject());  //输出：Mon Jan 05 17:18:39 CST 2009  
47.              System.out.println(in.readObject());  //输出：username: yoyo, password: null  
48.               
49.          } catch (FileNotFoundException e) {  
50.              e.printStackTrace();  
51.          } catch (IOException e) {  
52.              e.printStackTrace();  
53.          } catch(ClassNotFoundException e) {  
54.              e.printStackTrace();  
55.          }  
56.      }  
57. }  

import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.Date; public class sirializableTest implements Serializable { private String username; private transient String password; //不会参与序列化与反序列化的过程 public sirializableTest(String username, String password) { this.username = username; this.password = password; } public String toString() { return "username: " + username + ", password: " + password; } public static void main(String[] args) { try { File f = new File("C:\\a.obj"); if(!f.exists()) f.createNewFile(); //序列化对象 ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(f)); out.writeObject("Happy New Year !"); out.writeObject(new Date()); sirializableTest test = new sirializableTest("yoyo", "20090105"); out.writeObject(test); out.close(); //反序列化对象 ObjectInputStream in = new ObjectInputStream(new FileInputStream(f)); System.out.println(in.readObject()); //输出：Happy New Year ! System.out.println(in.readObject()); //输出：Mon Jan 05 17:18:39 CST 2009 System.out.println(in.readObject()); //输出：username: yoyo, password: null } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch(ClassNotFoundException e) { e.printStackTrace(); } } }

       当然，保存的文件也可以是其他格式。如果用记事本打开，会看到一堆乱码。