利用序列化与反序列化对Java对象进行深度复制

来源  http://lhg803.iteye.com/blog/407270

JDK的API中的java.lang.Object和Cloneable接口要完美实现深度clone时，都需要针对具体的类改代码。
采用序列化与反序列化可以完全独立于具体的某个类进行深度复制。

采用此方法做深度拷贝时，要求所有对象implements Serializable，否则报java.io.NotSerializableException异常。

实例：

 学生类

package cup1;

import java.io.Serializable;

public class Student implements Serializable{
    private String name;
    private String tel;
    private int age;
    
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getTel() {
        return tel;
    }
    public void setTel(String tel) {
        this.tel = tel;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    
}

教师类，包括一个学生对象列表

package cup1;

import java.io.Serializable;
import java.util.List;

public class Teacher implements Serializable{
    private String name;
    private int age;
    private List<Student> stuList;
    
    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;
    }
    public List<Student> getStuList() {
        return stuList;
    }
    public void setStuList(List<Student> stuList) {
        this.stuList = stuList;
    }

}

测试类，包括main方法和deepClone对象深度克隆方法

package cup1;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

public class Test {

    public static void main(String[] args) {
        Student s1 = new Student();
        s1.setName("Wang");
        s1.setAge(25);
        s1.setTel("110");
        Student s2 = new Student();
        s2.setName("Li");
        s2.setAge(35);
        s2.setTel("119");

        Teacher t = new Teacher();
        t.setName("Zhang");
        t.setAge(50);
        List<Student> stuList = new ArrayList<Student>();
        stuList.add(s1);
        stuList.add(s2);
        t.setStuList(stuList);
        System.out.println("-------original-------");
        System.out.println("t: " + t);
        System.out.println("s1: " + s1);
        System.out.println("s2: " + s2);
        System.out.println("-------after clone-------");
        Teacher t2 = (Teacher) deepClone(t);
        System.out.println("t2: " + t2);
        System.out.println("t: " + t);

        Student s3 = t2.getStuList().get(0);
        Student s4 = t2.getStuList().get(1);
        System.out.println("s3: " + s3);
        System.out.println("s1: " + s1);
        System.out.println("s4: " + s4);
        System.out.println("s2: " + s2);

        System.out.println("-------after t2 change-------");
        t2.setAge(55);
        t2.setName("Zhao");

        System.out.println("t2 Name: " + t2.getName() + " t2 age" + t2.getAge());
        System.out.println("t Name: " + t.getName() + " t age" + t.getAge());

    }

    public static Object deepClone(Object src) {
        Object dst = null;

        try {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ObjectOutputStream oo = new ObjectOutputStream(out);
            oo.writeObject(src);

            ByteArrayInputStream in = new ByteArrayInputStream(
                    out.toByteArray());
            ObjectInputStream oi = new ObjectInputStream(in);
            dst = oi.readObject();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        
        return dst;
    }
}

输出结果

-------original-------
t: cup1.Teacher@1fb8ee3
s1: cup1.Student@61de33
s2: cup1.Student@14318bb
-------after clone-------
t2: cup1.Teacher@12ac982
t: cup1.Teacher@1fb8ee3
s3: cup1.Student@1389e4
s1: cup1.Student@61de33
s4: cup1.Student@c20e24
s2: cup1.Student@14318bb
-------after t2 change-------
t2 Name: Zhao t2 age55
t Name: Zhang t age50