package com.io.test;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.*;
import java.util.*;public class Test implements Serializable {//Serializable接口没有任何方法，只是一个标识接口public static void main(String[] args) throws Exception {new Test().test();}private void test() throws FileNotFoundException, IOException, ClassNotFoundException {Map<Integer, Film> map = new HashMap<Integer, Film>();map.put(1, new Film("变形金刚", 20));map.put(2, new Film("钢铁侠", 30));map.put(3, new Film("复仇者联盟", 40));/*，序列化其实就是将film的相关信息转化为二进制存储在了map.txt这个文件中，那么用文本编辑器打开查看的话当然是会出现乱码的。只有通过反序列化才能将存储的二进制读取出来，然后正常显示在控制台上。*/ObjectOutputStream oos =  new ObjectOutputStream(new FileOutputStream("map.txt"));oos.writeObject(map);oos.close();/*反序列化*/ObjectInputStream ois = new ObjectInputStream(new FileInputStream("map.txt"));Map<Integer, Film> m = new HashMap<Integer, Film>();m = (Map<Integer, Film>) ois.readObject();ois.close();System.out.println(m.toString());}class Film implements Serializable {//先执行序列化方法 唯一标识是1L  然后改成2L后   反序列化输出会报错private static final long serialVersionUID = 1L;private String name;private int duration;public Film(String name, int duration) {this.name = name;this.duration = duration;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getDuration() {return duration;}public void setDuration(int duration) {this.duration = duration;}public Film() {}@Overridepublic String toString() {return "Film{" +"name='" + name + '\'' +", duration=" + duration +'}';}}
}