对象字节输出流ObjectOutputStream可以把对象存储到文件中

  1. // 创建一个学生对象
  2. Student s=new Student("18","xxx",25,"3班");
  4. // 对象序列化
  5. ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("src/d1.txt"));
  7. // 直接调用序列化
  8. oos.writeObject(s);
  10. // 释放资源
  11. oos.close();

对象字节输入流ObjectInputStream把文件中的对象数据，恢复成内存中的Java对象

  2. // 1、创建对象字节输入流管道包装低级的字节输入流管道
  3. ObjectInputStream ois = new ObjectInputStream(new FileInputStream("src/d1.txt"));
  5. // 2、调用对象字节输入流的反序列化方法
  6. Student s = (Student) ois.readObject();
  8. System.out.println(s);

需要设置序列化接口implements Serializable

  1. package xuexi.variable;
  3. import java.io.Serializable;
  4. import java.util.Objects;
  6. public class Student implements Serializable {
  7.     //私有变量
  8.     private String num;
  9.     private String name;
  10.     private int age;
  11.     private transient String className; //transient表示不参与序列化
  13.     public Student() {
  14.     }
  16.     public Student(String num, String name, int age, String className) {
  17.         this.num = num;
  18.         this.name = name;
  19.         this.age = age;
  20.         this.className = className;
  21.     }
  23.     @Override
  24.     public String toString() {
  25.         return "Student{" +
  26.                 "num='" + num + '\'' +
  27.                 ", name='" + name + '\'' +
  28.                 ", age=" + age +
  29.                 ", className='" + className + '\'' +
  30.                 '}';
  31.     }
  33.     @Override
  34.     public boolean equals(Object o) {
  35.         if (this == o) return true;
  36.         if (o == null || getClass() != o.getClass()) return false;
  37.         Student student = (Student) o;
  38.         return age == student.age &&
  39.                 Objects.equals(num, student.num) &&
  40.                 Objects.equals(name, student.name) &&
  41.                 Objects.equals(className, student.className);
  42.     }
  44.     @Override
  45.     public int hashCode() {
  46.         return Objects.hash(num, name, age, className);
  47.     }
  49.     public String getNum() {
  50.         return num;
  51.     }
  53.     public void setNum(String num) {
  54.         this.num = num;
  55.     }
  57.     public String getName() {
  58.         return name;
  59.     }
  61.     public void setName(String name) {
  62.         this.name = name;
  63.     }
  65.     public int getAge() {
  66.         return age;
  67.     }
  69.     public void setAge(int age) {
  70.         this.age = age;
  71.     }
  73.     public String getClassName() {
  74.         return className;
  75.     }
  77.     public void setClassName(String className) {
  78.         this.className = className;
  79.     }
  80. }