Java对对象的序列化和反序列化

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发表于：2011-11-01 09:20

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作者：a352193394 来源：51Testing软件测试网采编

　　下面是第二种方式

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package com.bird.thinking;
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();
}
}