Java对象的序列化和反序列化

一、序列化和反序列化的概念

　　把对象转换为字节序列的过程称为对象的序列化。　　对象反序列化的步骤如下：

 1 import java.io.Serializable; 2 3 /** 4 * <p>ClassName: Person<p> 5 * <p>Description:测试对象序列化和反序列化<p> 6 * @author xudp 7 * @version 1.0 V 8 * @createTime 2014-6-9 下午02:33:25 9 */10 public class Person implements Serializable {11 12   /**13   * 序列化ID14   */15   private static final long serialVersionUID = -5809782578272943999L;16   private int age;17   private String name;18   private String sex;19 20   public int getAge() {21     return age;22   }23 24   public String getName() {25     return name;26   }27 28   public String getSex() {29     return sex;30   }31 32   public void setAge(int age) {33     this.age = age;34   }35 36   public void setName(String name) {37     this.name = name;38   }39 40   public void setSex(String sex) {41     this.sex = sex;42   }43 }

　　序列化和反序列化Person类对象

 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.io.Serializable; 9 10 public class TestSerialversionUID {11 12   public static void main(String[] args) throws Exception {13     SerializeCustomer();// 序列化Customer对象14     Customer customer = DeserializeCustomer();// 反序列Customer对象15     System.out.println(customer);16   }17 18   /**19   * MethodName: SerializeCustomer 20   * Description: 序列化Customer对象21   * @author xudp22   * @throws FileNotFoundException23   * @throws IOException24   */25   private static void SerializeCustomer() throws FileNotFoundException,26       IOException {27     Customer customer = new Customer("gacl",25);28     // ObjectOutputStream 对象输出流29     ObjectOutputStream oo = new ObjectOutputStream(new FileOutputStream(30         new File("E:/Customer.txt")));31     oo.writeObject(customer);32     System.out.println("Customer对象序列化成功！");33     oo.close();34   }35 36   /**37   * MethodName: DeserializeCustomer 38   * Description: 反序列Customer对象39   * @author xudp40   * @return41   * @throws Exception42   * @throws IOException43   */44   private static Customer DeserializeCustomer() throws Exception, IOException {45     ObjectInputStream ois = new ObjectInputStream(new FileInputStream(46         new File("E:/Customer.txt")));47     Customer customer = (Customer) ois.readObject();48     System.out.println("Customer对象反序列化成功！");49     return customer;50   }51 }52 53 /**54 * <p>ClassName: Customer<p>55 * <p>Description: Customer实现了Serializable接口，可以被序列化<p>56 * @author xudp57 * @version 1.0 V58 * @createTime 2014-6-9 下午04:20:1759 */60 class Customer implements Serializable {61   //Customer类中没有定义serialVersionUID62   private String name;63   private int age;64 65   public Customer(String name, int age) {66     this.name = name;67     this.age = age;68   }69 70   /*71   * @MethodName toString72   * @Description 重写Object类的toString()方法73   * @author xudp74   * @return string75   * @see java.lang.Object#toString()76   */77   @Override78   public String toString() {79     return "name=" + name + ", age=" + age;80   }81 }

运行结果：

序列化和反序列化都成功了。

下面我们修改一下Customer类，添加多一个sex属性，如下：

 1 class Customer implements Serializable { 2   /** 3   * Customer类中定义的serialVersionUID(序列化版本号) 4   */ 5   private static final long serialVersionUID = -5182532647273106745L; 6   private String name; 7   private int age; 8 9   //新添加的sex属性10   //private String sex;11   12   public Customer(String name, int age) {13     this.name = name;14     this.age = age;15   }16   17   /*public Customer(String name, int age,String sex) {18     this.name = name;19     this.age = age;20     this.sex = sex;21   }*/22 23   /*24   * @MethodName toString25   * @Description 重写Object类的toString()方法26   * @author xudp27   * @return string28   * @see java.lang.Object#toString()29   */30   @Override31   public String toString() {32     return "name=" + name + ", age=" + age;33   }34 }

　　重新执行序列化操作，将Customer对象序列化到本地硬盘的Customer.txt文件存储，然后修改Customer类，添加sex属性，修改后的Customer类代码如下：

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原标题：Java对象的序列化和反序列化

关键词：JAVA