java使用类序列化反序列化(读写文件)

创建类：Role

package com.wbg.springRedis.entity;

import java.io.Serializable;

public class Role implements Serializable {
    private int id;
    private String roleName;
    private String note;
    @Override
    public String toString() {
        return "Role{" +
                "id=" + id +
                ", roleName='" + roleName + '\'' +
                ", note='" + note + '\'' +
                '}';
    }

    public Role() {
    }

    public Role(String roleName, String note) {
        this.roleName = roleName;
        this.note = note;
    }

    public Role(int id, String roleName, String note) {
        this.id = id;
        this.roleName = roleName;
        this.note = note;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }
}

一、序列化写文件：

　　　　List<Role> list = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            Role role = new Role(i, "roleName" + i, "note" + i);
            list.add(role);
        }

        FileOutputStream fileInputStream = new FileOutputStream(new File("g:/role.class"));
        ObjectOutputStream stream = new ObjectOutputStream(fileInputStream);
        stream.writeObject(list);
        stream.close();

二、反序列化读取文件：

  FileInputStream fileInputStream = new FileInputStream(new File("g:/role.class"));
       ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
        System.out.println(objectInputStream.readObject());