Java反序列化測試

前言：有沒有想過，如何將對象進行“加密”后寫入磁盤？序列化幫你實現！

1.概念

序列化 (Serialization)將對象的狀態信息轉換為可以存儲或傳輸的形式的過程。在序列化期間，對象將其當前狀態寫入到臨時或持久性存儲區。以后，可以通過從存儲區中讀取或反序列化對象的狀態，重新創建該對象.

2.反序列化Java實驗

--測試的實體類--

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)單對象序列化

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("張三", 30));
        oos.close();
    }
}

結果顯示

 

2)多對象序列化

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("張三",18); 
        Person p2 = new Person("李四",19); 
        persons.add(p1);
        persons.add(p2);
        oos.writeObject(persons);
        oos.close();
    }
}

結果顯示

注意：

·實體類必須實現序列化接口“java.io.Serializable”

·生成的obj.object 因為是二進制文件，故無法正常打開，若notepad打開也是亂碼！

 

總結：序列化技術在web端技術的應用相當重要，希望學習Java的朋友都能理解該技術並進行應用。