利用序列化與還原序列化對Java對象進行深度複製

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

JDK的API中的java.lang.Object和Cloneable介面要完美實現深度clone時，都需要針對具體的類改代碼。
採用序列化與還原序列化可以完全獨立於具體的某個類進行深度複製。

採用此方法做深度拷貝時，要求所有對象implements Serializable，否則報java.io.NotSerializableException異常。

執行個體：

 學生類

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;
    }

}

教師類，包括一個學生對象列表

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;
    }

}

測試類別，包括main方法和deepClone對象深度複製方法

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;
    }
}

輸出結果

-------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