1. import java.io.*;
   
2. class Person implements Serializable
   
3. {
   
4. private String name;
   
5. String age;
   
6. static String country = "cn";
   
7. Person(String name,String age)
   
8. {
   
9. this.name = name;
   
10. this.age = age;
    
11. }
    
12. public void setName(String name)
    
13. {
    
14. this.name = name;
    
15. }
    
16. public String getName()
    
17. {
    
18. return name;
    
19. }
    
20. public void setAge(String age)
    
21. {
    
22. this.age = age;
    
23. }
    
24. public String getAge()
    
25. {
    
26. return age;
    
27. }
    
28. public int hashCode()
    
29. {
    
30. return name.hashCode()+Integer.parseInt(age)*18;
    
31. }
    
32. public boolean equals(Object obj)
    
33. {
    
34. if (!(obj instanceof Person))
    
35. {
    
36. return false;
    
37. }
    
38. Person p = (Person)obj;
    
39. return this.name.equals(p.name)&&this.age.equals(p.age);
    
40. }
    
41. public String toString()
    
42. {
    
43. return name+":"+age+":"+country;
    
44. }
    
45. }
    
46. class ObjStreamDemo
    
47. {
    
48. public static void main(String[] args) throws IOException,ClassNotFoundException
    
49. {
    
50. writeObj();//将对象写入到person.txt文件中。
    
51. readObj();//将person.txt文件中的对象打印到控制台上。
    
52. }
    
53. public static void readObj() throws IOException,ClassNotFoundException
    
54. {
    
55. ObjectInputStream ois = new ObjectInputStream(
    
56. new FileInputStream("person.txt"));
    
57. Object obj = null;
    
58. while ((obj=ois.readObject())!=null )
    
59. {
    
60. if (!(obj instanceof Person))
    
61. {
    
62. throw new RuntimeException ("对象错误");
    
63. }
    
64. Person p = (Person) obj;
    
65. System.out.println(p);
    
66. }
    
67. ois.close();
    
68. }
    
69. public static void writeObj() throws IOException
    
70. {
    
71. ObjectOutputStream oos = new ObjectOutputStream(
    
72. new FileOutputStream("person.txt"));
    
73. oos.writeObject(new Person("lisi","39"));
    
74. oos.writeObject(new Person("wangwu","40"));
    
75. oos.writeObject(new Person("sunliu","50"));
    
76. oos.flush();
    
77. oos.close();
    
78. }
    
79. }

复制代码

运行结果是正确的，但会报出以下异常：
Exception in thread "main" java.io.EOFException
        at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputSt
ream.java:2601)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
        at ObjStreamDemo.readObj(ObjStreamDemo.java:58)
        at ObjStreamDemo.main(ObjStreamDemo.java:51)

和readLine的原理不同，读到文件尾就抛出异常