前言:有没有想过,如何将对象进行“加密”后写入磁盘?序列化帮你实现!
1.概念
序列化 (Serialization)将对象的状态信息转换为可以存储或传输的形式的过程。在序列化期间,对象将其当前状态写入到临时或持久性存储区。以后,可以通过从存储区中读取或反序列化对象的状态,重新创建该对象.
2.反序列化Java实验
--测试的实体类--
package exercise;
import java.io.Serializable;
public class Person implements Serializable{
private String name;
private int age;
public Person() {
}
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 Person(String name, int age) {
super();
this.name = name;
this.age = age;
}
}
1)单对象序列化
package exercise;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;
public class ObjectStreamDemo1 {
/**
* @param args
* @throws IOException
* @throws ClassNotFoundException
*/
public final static String PATH = "obj.object1";
public static void main(String[] args) throws IOException,
ClassNotFoundException {
//writeObj();
readObj();
System.out.println("--End--");
}
public static void readObj() throws IOException, ClassNotFoundException {
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(
PATH));
Person p = (Person)ois.readObject();
System.out.println(p.getName() + "|" + p.getAge());
}
public static void writeObj() throws IOException {
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(
PATH));
oos.writeObject(new Person("张三", 30));
oos.close();
}
}
结果显示
2)多对象序列化
package exercise;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;
public class ObjectStreamDemo2 {
/**
* @param args
* @throws IOException
* @throws ClassNotFoundException
*/
public final static String PATH = "obj.object";
public static void main(String[] args) throws IOException,
ClassNotFoundException {
//writeObj();
readObj();
System.out.println("---end!---");
}
public static void readObj() throws IOException, ClassNotFoundException {
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(
PATH));
List<Person> persons = (List<Person>)ois.readObject();
for(Person p:persons){
System.out.println(p.getName() + "|" + p.getAge());
}
}
public static void writeObj() throws IOException {
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(
PATH));
List<Person> persons = new ArrayList<Person>();
Person p1 = new Person("张三",18);
Person p2 = new Person("李四",19);
persons.add(p1);
persons.add(p2);
oos.writeObject(persons);
oos.close();
}
}
结果显示
注意:
·实体类必须实现序列化接口“java.io.Serializable”
·生成的obj.object 因为是二进制文件,故无法正常打开,若notepad打开也是乱码!
总结:序列化技术在web端技术的应用相当重要,希望学习Java的朋友都能理解该技术并进行应用。
以上内容纯属个人学习总结,不代表任何团体或单位。若有理解不到之处请见谅!