Java對象序列化ObjectOutputStream和ObjectInputStream示例

Java中ObjectInputStream 與 ObjectOutputStream這兩個包裝類可用於輸入流中讀取對象類數據和將對象類型的數據寫入到底層輸入流 。ObjectInputStream 與 ObjectOutputStream 類所讀寫的對象必須實現了 Serializable 接口。需要注意的是：對象中的 transient 和 static 類型的成員變量不會被讀取和寫入 。

具體代碼示例：

O bjectFileConvert.java

1. package michael.io;
3. import java.io.File;
4. import java.io.FileInputStream;
5. import java.io.FileOutputStream;
6. import java.io.IOException;
7. import java.io.ObjectInputStream;
8. import java.io.ObjectOutputStream;
9. import java.util.ArrayList;
10. import java.util.Date;
11. import java.util.List;
14. /**
15. * @blog http://sjsky.iteye.com
16. * @author Michael
17. */
18. public class ObjectFileConvert {
20. /**
21. * 文件轉化為Object
22. * @param fileName
23. * @return byte[]
24. */
25. public static Object file2Object(String fileName) {
27. FileInputStream fis = null;
28. ObjectInputStream ois = null;
29. try {
30. fis = new FileInputStream(fileName);
31. ois = new ObjectInputStream(fis);
32. Object object = ois.readObject();
33. return object;
34. } catch (Exception e) {
35. e.printStackTrace();
36. } finally {
37. if (fis != null) {
38. try {
39. fis.close();
40. } catch (IOException e1) {
41. e1.printStackTrace();
42. }
43. }
44. if (ois != null) {
45. try {
46. ois.close();
47. } catch (IOException e2) {
48. e2.printStackTrace();
49. }
50. }
51. }
52. return null;
53. }
55. /**
56. * 把Object輸出到文件
57. * @param obj
58. * @param outputFile
59. */
60. public static void object2File(Object obj, String outputFile) {
61. ObjectOutputStream oos = null;
62. FileOutputStream fos = null;
63. try {
64. fos = new FileOutputStream(new File(outputFile));
65. oos = new ObjectOutputStream(fos);
66. oos.writeObject(obj);
67. } catch (Exception e) {
68. e.printStackTrace();
69. } finally {
70. if (oos != null) {
71. try {
72. oos.close();
73. } catch (IOException e1) {
74. e1.printStackTrace();
75. }
76. }
77. if (fos != null) {
78. try {
79. fos.close();
80. } catch (IOException e2) {
81. e2.printStackTrace();
82. }
83. }
84. }
85. }
87. /**
88. * @param args
89. */
90. @SuppressWarnings("unchecked")
91. public static void main(String[] args) {
92. String fileName = "d:/test/object.obj";
93. List<String> list = new ArrayList<String>();
94. list.add("michael");
95. list.add("大大");
97. ObjectFileConvert.object2File(list, fileName);
98. System.out.println("success write List<String> to file.");
100. List<String> tmpList = (List<String>) ObjectFileConvert
101. .file2Object(fileName);
102. for (String tmp : tmpList) {
103. System.out.println(tmp);
104. }
106. System.out.println("--------------------------------");
108. fileName = "d:/test/uservo.obj";
109. UserVo vo = new UserVo("michael", "大大", 18, new Date());
111. ObjectFileConvert.object2File(vo, fileName);
112. System.out.println("success write bean:UserVo to file.");
114. UserVo tmpvo = (UserVo) ObjectFileConvert.file2Object(fileName);
115. System.out.println("read bean:UserVo from file get info : " + tmpvo);
117. }
119. }

UserVo.java

1. package michael.io;
3. import java.io.Serializable;
4. import java.util.Date;
6. /**
7. * @blog http://sjsky.iteye.com
8. * @author Michael
9. */
10. public class UserVo implements Serializable {
12. /**
13. * serialVersionUID
14. */
15. private static final long serialVersionUID = -6846034858002233878L;
17. private String userId;
19. private String userName;
21. private int age;
23. private Date born;
25. public UserVo() {
26. }
28. public UserVo(String userId, String userName, int age, Date born) {
29. this.userId = userId;
30. this.userName = userName;
31. this.age = age;
32. this.born = born;
33. }
35. /**
36. * @return the userId
37. */
38. public String getUserId() {
39. return userId;
40. }
42. /**
43. * @return the userName
44. */
45. public String getUserName() {
46. return userName;
47. }
49. /**
50. * @return the age
51. */
52. public int getAge() {
53. return age;
54. }
56. /**
57. * @return the born
58. */
59. public Date getBorn() {
60. return born;
61. }
63. /**
64. * @param pUserId the userId to set
65. */
66. public void setUserId(String pUserId) {
67. userId = pUserId;
68. }
70. /**
71. * @param pUserName the userName to set
72. */
73. public void setUserName(String pUserName) {
74. userName = pUserName;
75. }
77. /**
78. * @param pAge the age to set
79. */
80. public void setAge(int pAge) {
81. age = pAge;
82. }
84. /**
85. * @param pBorn the born to set
86. */
87. public void setBorn(Date pBorn) {
88. born = pBorn;
89. }
91. @Override
92. public String toString() {
93. return "userId=[ " + userId + " ] userName=[ " + userName + " ] age=[ "
94. + age + " ] born=[ " + born + "] .";
95. }
97. }

運行結果如下：

success write List<String> to file.
michael
大大
--------------------------------
success write bean:UserVo to file.
read bean:UserVo from file get info : userId=[ michael ] userName=[ 大大 ] age=[ 18 ] born=[ Mon Aug 01 13:49:33 CST 2011] .