话说JAVA SE 序列化（serializable）与 外部化（externalizable）简单实例

import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.Serializable;import java.io.IOException;import java.io.FileNotFoundException;import java.io.Externalizable;import java.io.ObjectInput;import java.io.ObjectOutput;//自己控制序列化的过程中，被序列化的类必须有一个无参的构造方法，否则将出现（java.io.InvalidClassException）异常public class TestObjectSerializable {public static void main(String [] args) {Persion p = new Persion("xxxx",24,"man");try{FileOutputStream fos = new FileOutputStream("d:/meteor/serable.txt");ObjectOutputStream oos = new ObjectOutputStream(fos);oos.writeObject(p);oos.flush();oos.close();FileInputStream fis = new FileInputStream("d:/meteor/serable.txt");ObjectInputStream ois = new ObjectInputStream(fis);Persion per = (Persion)ois.readObject();System.out.println(per);ois.close();}catch(FileNotFoundException fe){System.out.println("所指定文件不是有效，或者它是一个目录");System.exit(-1);}catch(ClassNotFoundException ce){ce.printStackTrace();}catch(IOException e){e.printStackTrace();}}}/*class Persion implements Externalizable {private String name;private int age;private String sex;public Persion(String name,int age,String sex){this.name = name;this.age = age;this.sex = sex;}public Persion() {};public String toString(){return "姓名：" + this.name + " 年龄：" + this.age + " 性别：" + this.sex;}public void readExternal(ObjectInput in) throws IOException,ClassNotFoundException{this.name = in.readUTF();this.age = in.readInt();//this.sex = in.readUTF();}public void writeExternal(ObjectOutput out) throws IOException {out.writeUTF(this.name);out.writeInt(this.age);//out.writeUTF(this.sex);}}*/class Persion implements Serializable {private String name;private int age;private transient String sex;public Persion(String name,int age,String sex){this.name = name;this.age = age;this.sex = sex;}public String toString(){return "姓名：" + this.name + " 年龄：" + this.age + " 性别：" + this.sex;}}