java序列化深拷贝

java深拷贝

序列化和反序列化合成在一起的方法CloneUtils

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.HashMap;

/**
 * 深拷贝类
 * @author King
 */
public class CloneUtils {
    /**
     * 核心深拷贝方法,其它都是测试方法
     * @param obj
     * @author King
     * @return
     */
    @SuppressWarnings("unchecked")
    public static <T extends Serializable> T clone(T obj) {
        T clonedObj = null;
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(baos);
            oos.writeObject(obj);
            oos.close();
            ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
            ObjectInputStream ois = new ObjectInputStream(bais);
            clonedObj = (T) ois.readObject();
            ois.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return clonedObj;
    }

    static class Student implements Serializable{
        String id = "";
        String name = "";

        public Student(String id, String name) {
            super();
            this.id = id;
            this.name = name;
        }
        public String getId() {
            return id;
        }
        public void setId(String id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }

    }

    public static void main(String[] args) {
        HashMap<String ,Student> map1 = new HashMap<String ,Student>();
        Student stu1 = new Student("1","xixi");
        map1.put("stu", stu1);
        HashMap<String ,Student> map2 =  CloneUtils.clone(map1);
        map2.get("stu").setName("bobo");//把新clone的map2中的Student设新值bobo,且它是对象哦

        System.out.println(map1.get("stu").getName());//把旧的map1中的Student拿出来发现还是xixi,这说明深拷贝成功
    }
}

序列化和反序列化独立方法SerializeUtil

package com.testdemo.pcis.isc.redis;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.Map;
/**
 * 序列化对象工具类.
 * 参考网址:http://alanland.iteye.com/blog/1600685
 * @author King
 *
 */
public class SerializeUtil {
    public static byte[] serialize(Object object) {
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        try {
            // 序列化
            baos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(baos);
            oos.writeObject(object);
            byte[] bytes = baos.toByteArray();
            return bytes;
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                oos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    public static Object unserialize(byte[] bytes) {
        ByteArrayInputStream bais = null;
        ObjectInputStream ois = null;
        try {
            // 反序列化
            bais = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bais);
            return ois.readObject();
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                ois.close();
            } catch (IOException e) {
                e.printStackTrace();
                System.out.println("bytes.length"+bytes.length);
            }
        }
        return null;
    }

    public static void main(String[] args) {
        Map<String,String> hashMap = new HashMap<String,String>();
        hashMap.put("a","b");
        byte[] bs = SerializeUtil.serialize(hashMap);
        @SuppressWarnings("unchecked")
        Map<String,String> deepCopyMap =(Map<String,String>) SerializeUtil.unserialize(bs);
        System.out.println(deepCopyMap);
    }
}