代码生成（复制一个JavaBean）

以下是使用序列化和反序列化技术复制一个JavaBean的示例代码：

import java.io.*;

public class JavaBeanUtils {
    public static <T extends Serializable> T copy(T object) throws IOException, ClassNotFoundException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(object);
        oos.flush();
        oos.close();
        bos.close();
 
        byte[] byteData = bos.toByteArray();
 
        ByteArrayInputStream bais = new ByteArrayInputStream(byteData);
        T copy = (T) new ObjectInputStream(bais).readObject();
        return copy;
    }
}

使用示例：

public class Test {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        User user1 = new User("John", 20);
        User user2 = JavaBeanUtils.copy(user1);
        System.out.println(user1);
        System.out.println(user2);
    }
}

class User implements Serializable {
    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

输出结果：

User{name='John', age=20}
User{name='John', age=20}

可以看到，使用JavaBeanUtils.copy()方法即可复制一个JavaBean对象。