Java并发之Serializable

最新推荐文章于 2023-02-22 11:41:11 发布

原创最新推荐文章于 2023-02-22 11:41:11 发布 · 245 阅读

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本文通过一个具体的Java程序示例，介绍了如何使用Java的序列化机制来保存和恢复对象的状态。特别关注了transient关键字的作用及writeReplace和readResolve方法的应用。

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package com.lxht.test;

import java.io.*;

public class TestSerial {
    public static void main(String[] args) {
        SerialObject seObject = new SerialObject();
        seObject.setAge("2");
        seObject.setClassName("1年3班");
        seObject.setName("张三");

        try {
            System.out.println(seObject);
            FileOutputStream fos = new FileOutputStream(new File("cc.obj"));
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(seObject);
            oos.close();
            fos.close();

            FileInputStream fis = new FileInputStream(new File("cc.obj"));
            ObjectInputStream ois = new ObjectInputStream(fis);
            SerialObject tmpObj = (SerialObject)ois.readObject();
            System.out.println(tmpObj);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class SerialObject implements Serializable {

    private transient String age; //该类变量不会被序列号
    private String name;
    private String className;

    public String getAge() {
        return age;
    }

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

    public String getName() {
        return name;
    }

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

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    /**
     * ObjectOutputStream在调用writeObject方法时,
     *      writeObject中会判断是否有writeReplace(),如果有,则用writeReplace()获取到的Object做替换
     * @return
     * @throws ObjectStreamException
     */
    public Object writeReplace() throws ObjectStreamException{
        SerialObject writeObj = new SerialObject();
        writeObj.setName("王五");
        return writeObj;
    }

    /**
     * ObjectOutputStream在调用readObject方法时,
     * readObject中会判断是否有readResolve(),如果有,则用readResolve获取到的Object做替换
     * @return
     * @throws ObjectStreamException
     */
    public Object readResolve() throws ObjectStreamException{
        SerialObject cc = new SerialObject();
        cc.setClassName("李四");
        return cc;
    }

    @Override
    public String toString() {
        String objStr = this.getName() + ";" + this.className + ";" + this.age;
        return objStr;
    }
}