java序列化实例类,在反序列化后,时间会变成null

Question

问题RT

/**
     * 序列化 list 集合
     * 
     * @param list
     * @return
     */
    public static byte[] serializeList(List<?> list) {
        if (list == null || list.size() == 0) {
            return null;
        }
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        byte[] bytes = null;
        try {
            baos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(baos);
            for (Object obj : list) {
                oos.writeObject(obj);
            }
            bytes = baos.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close(oos);
            close(baos);
        }
        return bytes;
    }

//反序列化代码
if (bytes == null) {
            return null;
        }
        List<Object> list = new ArrayList<Object>();
        ByteArrayInputStream bais = null;
        ObjectInputStream ois = null;
        try {
            // 反序列化
            bais = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bais);
            while (bais.available() > 0) {
                Object obj = (Object) ois.readObject();
                if (obj == null) {
                    break;
                }
                list.add(obj);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close(bais);
            close(ois);
        }
        return list;

Answer 1

按楼主贴的代码，测试了一下，是没有问题的：

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.Date;
import java.util.List;

public class TestSeriales {
    public static void main(String[] args) {
        Date d1 = new Date();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        Date d2 = new Date();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        Date d3 = new Date();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        Date d4 = new Date();

        HostComputer h1 = new HostComputer(d1,d2);
        HostComputer h2 = new HostComputer(d3,d4);

        List<Object> list = new ArrayList<Object>();
        list.add(h1);
        list.add(h2);
        try {
            byte[] bytes = serializeList(list);
            System.out.println("after deseriable result is:");
            List<Object> list2 = (List<Object>) descri(bytes);
            for(Object o:list2) {
                System.out.println(o);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    /**
     * 序列化 list 集合
     * 
     * @param list
     * @return
     * @throws IOException
     */
    public static byte[] serializeList(List<?> list) throws IOException {
        if (list == null || list.size() == 0) {
            return null;
        }
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        byte[] bytes = null;
        try {
            baos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(baos);
            for (Object obj : list) {
                oos.writeObject(obj);
            }
            bytes = baos.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            oos.close();
            baos.close();
        }
        return bytes;
    }

    public static List<?> descri(byte[] bytes) throws IOException {
        // 反序列化代码
        if (bytes == null) {
            return null;
        }
        List<Object> list = new ArrayList<Object>();
        ByteArrayInputStream bais = null;
        ObjectInputStream ois = null;
        try {
            // 反序列化
            bais = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bais);
            while (bais.available() > 0) {
                Object obj = (Object) ois.readObject();
                if (obj == null) {
                    break;
                }
                list.add(obj);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            ois.close();
            bais.close();
        }
        return list;
    }
}

HostComputer 定义为：

import java.io.Serializable;
import java.util.Date;

public class HostComputer implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private Date startTime;
    private Date endTime;

    public HostComputer(Date startTime,Date endTime) {
        this.startTime = startTime;
        this.endTime = endTime;
    }

    @Override
    public String toString() {
        return "HostComputer [startTime=" + startTime + ", endTime=" + endTime + "]";
    }
}

测试结果：

after deseriable result is:
HostComputer [startTime=Fri Jan 03 09:13:25 CST 2020, endTime=Fri Jan 03 09:13:26 CST 2020]
HostComputer [startTime=Fri Jan 03 09:13:27 CST 2020, endTime=Fri Jan 03 09:13:28 CST 2020]

楼主可以对照您的实现对比一下，看看什么地方的问题。