IO-对象流

public class Student implements Serializable{
    private static final long serialVersionUID = 1L;
    private String name;
    private int age;
    private double score;
    
    public Student() {
        
    }
    
    public Student(String name, int age, double score) {
        super();
        this.name = name;
        this.age = age;
        this.score = score;
    }

    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 double getScore() {
        return score;
    }
    public void setScore(double score) {
        this.score = score;
    }
    
}

public class TestObjectStream {
    public static void main(String[] args) {
        Student stu = new Student("zhangsan",20,80);
        File file = new File("D:/test.obj");
        try {
            //1.对象序列化
            OutputStream ops = new FileOutputStream(file);
            ObjectOutputStream oos = new ObjectOutputStream(ops);
            oos.writeObject(stu);//将stu对象写入指定位置 (序列化)
            oos.writeDouble(3.14);//将stu对象写入指定位置 (序列化)
            oos.flush();
            //2.反序列化
            InputStream ips = new FileInputStream(file);
            ObjectInputStream ois = new ObjectInputStream(ips);
            Student stu2 = (Student)ois.readObject();
            double pi =  ois.readDouble();
            System.out.println(stu2.getName()+"---"+stu2.getAge()+"---"+stu2.getScore());
            System.out.println("pi="+pi);
            //关闭资源
            oos.close();
            ops.close();
            ois.close();
            ips.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

public class Dept implements Serializable{
    private int deptId;
    private String deptName;
    public Dept(){
        
    }
    public Dept(int deptId,String deptName){
        this.deptId= deptId;
        this.deptName=deptName;
    }
    
    public int getDeptId() {
        return deptId;
    }
    public void setDeptId(int deptId) {
        this.deptId = deptId;
    }
    public String getDeptName() {
        return deptName;
    }
    public void setDeptName(String deptName) {
        this.deptName = deptName;
    }
    
}

public class Employee implements Serializable{
    private int empId;
    private String empName;
    private transient int empAge; //使用transient修饰的属性，该属性不能被序列化
    private Dept dept;//封装了该员工对于的部门信息
    
    
    
    public Employee() {
        
    }
    
    public Employee(int empId, String empName, int empAge, Dept dept) {
        this.empId = empId;
        this.empName = empName;
        this.empAge = empAge;
        this.dept = dept;
    }

    public int getEmpId() {
        return empId;
    }
    public void setEmpId(int empId) {
        this.empId = empId;
    }
    public String getEmpName() {
        return empName;
    }
    public void setEmpName(String empName) {
        this.empName = empName;
    }
    public int getEmpAge() {
        return empAge;
    }
    public void setEmpAge(int empAge) {
        this.empAge = empAge;
    }
    public Dept getDept() {
        return dept;
    }
    public void setDept(Dept dept) {
        this.dept = dept;
    }
    
    
    
}

public class TestObjectStream2 {
    public static void main(String[] args) {
        Dept dept = new Dept(1,"讨账部");
        Employee employee = new Employee(1,"陈浩南",28,dept);
        Employee employee2 = new Employee(2,"山鸡",27,dept);
        
        try {
            //序列化
            FileOutputStream fos = new FileOutputStream("tt.o");
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(employee);
            oos.writeObject(employee2);
            //反序列化
            FileInputStream fis = new FileInputStream("tt.o");
            ObjectInputStream ois  =new ObjectInputStream(fis);
            Employee emp = (Employee)ois.readObject();
            System.out.println(emp.getEmpId()+"--"+emp.getEmpName()+"--"+emp.getEmpAge());
            Dept dept2 = emp.getDept();
            System.out.println(dept2.getDeptId()+"--"+dept2.getDeptName());
            Employee emp2 = (Employee)ois.readObject();
            System.out.println(emp2.getEmpId()+"--"+emp2.getEmpName()+"--"+emp2.getEmpAge());
            Dept dept3 = emp2.getDept();
            System.out.println(dept3.getDeptId()+"--"+dept3.getDeptName());
            
            //关闭流
            oos.close();
            fos.close();
            ois.close();
            fis.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

public class User implements Serializable{
    private String name;
    private int age;
    private Gender gender;
    public User(){
    }
    public User(String name, int age, Gender gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }
    
    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 Gender getGender() {
        return gender;
    }
    public void setGender(Gender gender) {
        this.gender = gender;
    }
    @Override
    public String toString() {
        return "User [name=" + name + ", age=" + age + ", gender=" + gender + "]";
    }
}
//枚举
enum Gender{
    男,女
}

public class TestObjectStream3 {
    public static void main(String[] args) {
        List<User> list = new ArrayList<User>();
        User user1 = new User("zhangsan",30,Gender.男);
        User user2 = new User("zhangsan2",24,Gender.男);
        User user3 = new User("zhangsan3",28,Gender.男);
        list.add(user1);
        list.add(user2);
        list.add(user3);
        try {
//            序列化
            FileOutputStream fos = new FileOutputStream("D:/tt.o");
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(list);
            oos.flush();
            //反序列化
            FileInputStream fis = new FileInputStream("D:/tt.o");
            ObjectInputStream ois = new ObjectInputStream(fis);
            List<User> usersList = (List)ois.readObject();
            for (User user : usersList) {
                System.out.println(user);
            }
            
            ois.close();
            fis.close();
            oos.close();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        
    }
}