Java提供了将对象以字节的形式写入到磁盘中,在需要的时候在从磁盘中恢复的功能,在网络传输中非常有用,下面将代码贴上,分别用两种形式实现了对象的序列化,其中第二种当时能将指定的变量序列化,更加人性化的随心所欲
- import java.io.FileInputStream;
- import java.io.FileOutputStream;
- import java.io.ObjectInputStream;
- import java.io.ObjectOutputStream;
- import java.io.Serializable;
- /**
- * @use 实现对对象的序列化和反序列化
- * @author Bird
- *
- */
- public class Data {
- public static void writeObject() throws Exception{
- Worm worm = new Worm("Bird");
- ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("d://worm.out"));
- out.writeObject(worm);
- out.close();//关闭的同时也刷新清空了缓冲区
- }
- public static void readObject() throws Exception{
- ObjectInputStream in = new ObjectInputStream(new FileInputStream("d://worm.out"));
- Worm s2 = (Worm) in.readObject();
- System.out.println(s2);
- }
- public static void main(String[] args) throws Exception{
- // writeObject();
- readObject();
- }
- }
- class Worm implements Serializable{
- private static final long serialVersionUID = 1L;
- private String name = null;
- public Worm(String name){
- this.name = name;
- }
- public String toString(){
- return name;
- }
- }
- 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;
- /**
- * @use 第二种可控制序列化变量个数的方式
- * @author Bird
- *
- */
- public class Blip3 implements Externalizable {
- private int i;
- private String s;//没有实例化
- public Blip3(){
- System.out.println("Blip3 Constructor!!");
- }
- //注意 这里的s没有实例化
- public Blip3(String x, int a){
- System.out.println("Blip3(String x, int a)");
- s = x;
- i = a;
- //s 和 i实例化在非默认构造函数中
- }
- public String toString(){
- return s + i;
- }
- public void writeExternal(ObjectOutput out){//可选择写入变量
- System.out.println("Blip3.writeExternal");
- try {
- out.writeObject(s);
- out.writeInt(i);
- } catch (IOException e) {
- throw new RuntimeException(e);
- }//必须进行这两项,否则就一个变量也不出初始化
- }
- public void readExternal(ObjectInput in){//可选择读入数据
- System.out.println("Blip3.readExternal");
- try {
- s = (String)in.readObject();
- i = in.readInt();
- } catch (ClassNotFoundException e) {
- } catch (IOException e) {
- throw new RuntimeException(e);
- }
- }
- public void read() throws FileNotFoundException, IOException, ClassNotFoundException{//读取序列化的类
- ObjectInputStream in = new ObjectInputStream(new FileInputStream("d://Blip3.out"));
- System.out.println("Revovering b3");
- Blip3 b3 = (Blip3)in.readObject();
- System.out.println(b3);
- }
- public void write() throws Exception{//写入对象
- Blip3 b3 = new Blip3("A String", 47);
- System.out.println(b3);
- ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream("d://Blip3.out"));
- System.out.println("Saving Object");
- o.writeObject(b3);
- o.close();
- }
- public static void main(String[] args) throws Exception{
- Blip3 b = new Blip3();
- // b.write();
- b.read();
- }
- }
来源: http://www.phpxs.com/code/1001956/