利用Externalizable接口实现对象的自定义序列化

SerializedUser.java

import java.io.Externalizable;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

/**
 *利用Externalizable接口实现对象的自定义序列化
 * @author HaoWang
 */
public class SerializedUser implements Externalizable {
    private String name;
    private int age;
    private String email;
    
    public SerializedUser() {
        
    }
    public SerializedUser(String name, int age, String email) {
        this.name = name;
        this.age = age;
        this.email = email;
    }

    public int getAge() {
        return age;
    }

    public String getEmail() {
        return email;
    }

    public String getName() {
        return name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "SerializedUser{" + "name=" + name + "age=" + age + "email=" + email + '}';
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeUTF(this.getName());
        out.writeUTF("\t");
        out.writeInt(this.getAge());
        out.writeUTF("\t");
        out.writeUTF(this.getEmail());
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        this.setName(in.readUTF());
        in.readUTF();
        this.setAge(in.readInt());
        in.readUTF();
        this.setEmail(in.readUTF());
    }

    public static void main(String[] args) throws FileNotFoundException,IOException,ClassNotFoundException {
        FileOutputStream fos = new FileOutputStream("user.txt");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        SerializedUser user = new SerializedUser("wanghao", 22, "[e-mail]");
        oos.writeObject(user);
        oos.close();
        fos.close();
        System.out.println(user.getName()+"的信息已写入文件");
        FileInputStream fis = new FileInputStream("user.txt");
        ObjectInputStream ois = new ObjectInputStream(fis);
        user = (SerializedUser)ois.readObject();
        ois.close();
        fis.close();
        System.out.println("从文件中读到的用户信息为："+user.getName());
    }
}