2020.8.5第三十天

1.今天学习对象序列化与反序列化

序列化

将实体类标注为可以序列化

import java.io.Serializable;
public class Person implements Serializable{
private String name;
private int age;
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 String toString(){
    return "姓名: "+name+",年龄"+age;
}
}

写到文件中

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
public class ObjectoutputstreamDemo{
public static void main(String[] args) throws IOException{
ObjectOutputStream oos= new ObjectOutputStream (
new FileOutputStream (
"D:/Hello.txt"));
Person p= new Person();
p.setAge (20);
p.setName("伍正云");
oos.writeObject(p);
oos.close();
}
}

反序列化

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
public class objectInputStrearmDemo{
public static void main (String[] args) throws IOException,
ClassNotFoundException {
ObjectInputStream ois =new ObjectInputStream (
new FileInputStream(
"D:/Hello.txt"));
Person p= (Person) ois.readObject();
ois.close();
System.out.println (p);
}
}

 transient关键字

public class Person implements Serializable{
private transient String name;
private int age;
. . .
}

序列化一组对象

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
public class objectoutputstreamDemo2{
public static void main (String[]args) throws IOException{
ObjectOutputStream oos =new ObjectOutputStream(
new FileOutputStream(
"D:/Hello.txt"));
Person p= new Person();
p.setAge(20);
p.setName("伍正云");
Person p2=new Person();
p.setAge(20);
p.setName("伍正云22");
Person[] ps= {p,p2};
oos.writeObject(ps);
oos.close();
}
}

2.序列化的数据存到文件里变成乱码

3.明天继续学习第12章.