对象的序列化与反序列化：

对象的序列化，就是将Object转换成byte序列，反之叫对象的反序列化。

序列化流(ObjectOutInputStream),是过滤流　　——-writeObject

反序列化流(ObjectInputStream)—–raedObject

序列化接口(Serializable)

　　对象必须实现序列化接口，才能进行序列化，否则出现异常

　这个接口，没有任何方法，只是一个标准。

案例描述：Student，将它序列化到文件中，再反序列化读出。

Student类：

package Blog;import java.io.Serializable;public class Student implements Serializable{    private String stuno;
    private String stuname;
    private int stuage;    public Student(String stuno, String stuname, int stuage) {
        super();
        this.stuno = stuno;
        this.stuname = stuname;
        this.stuage = stuage;
    }    public Student() {
        super();
    }    public String getStuno() {
        return stuno;
    }    @Override
    public String toString() {
        return "Student [stuno=" + stuno + ", stuname=" + stuname + ", stuage=" + stuage + "]";
    }    public void setStuno(String stuno) {
        this.stuno = stuno;
    }    public String getStuname() {
        return stuname;
    }    public void setStuname(String stuname) {
        this.stuname = stuname;
    }    public int getStuage() {
        return stuage;
    }    public void setStuage(int stuage) {
        this.stuage = stuage;
    }}

序列化Student到obj.dat中

package Blog;import java.io.FileOutputStream;
import java.io.ObjectOutputStream;public class ObjectSeriaDemo1 {    public static void main(String[] args) throws Exception{
        String file = "obj.dat";
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));        Student stu = new Student("1001","zhangsan",20);
        oos.writeObject(stu);
        oos.flush();
        oos.close();    }
}

反序列化obj.dat

package Blog;import java.io.FileInputStream;
import java.io.ObjectInputStream;public class ObjectSeriaDemo1 {    public static void main(String[] args) throws Exception{
        String file = "obj.dat";        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
        Student stu = (Student)ois.readObject();
        System.out.println(stu);
        ois.close();
    }
}