Transient关键字的作用

 1 import java.io.*;
 2 import java.util.Date;
 3  
 4 
 5 /**
 6  * Created by leiqiang on 2014/7/25.
 7  */
 8 public class TransientTest implements Serializable{
 9     private Date date = new Date();
10     private String username;
11     private transient String password;
12 
13     public TransientTest(String username,String password){
14         this.username=username;
15         this.password=password;
16     }
17 
18     @Override
19     public String toString() {
20         return new Date()+" username "+username+" : password "+password;
21     }
22 
23     public static void main(String[] args) throws Exception{
24         TransientTest transientTest = new TransientTest("lei","1234");
25         System.out.println(transientTest);
26         FileOutputStream fileOutputStream = new FileOutputStream("d:/Cache/TransientTest.txt");
27         ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
28         objectOutputStream.writeObject(transientTest);
29         objectOutputStream.close();
30         Thread.sleep(2000);
31         FileInputStream fileInputStream = new FileInputStream("d:/Cache/TransientTest.txt");
32         ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
33         transientTest = (TransientTest)objectInputStream.readObject();
34         System.out.println(transientTest);
35     }
36 }

1 Fri Jul 25 13:56:13 CST 2014 username lei : password 1234
2 Fri Jul 25 13:56:15 CST 2014 username lei : password null