JAVA序列化与反序列化三种格式存取(默认格式、XML格式、JSON格式)
什么是序列化
java中的序列化(serialization)机制能够将一个实例对象的状态信息写入到一个字节流中,使其可以通过socket进行传输、或者持久化存储到数据库或文件系统中;然后在需要的时候,可以根据字节流中的信息来重构一个相同的对象。序列化机制在java中有着广泛的应用,EJB、RMI等技术都是以此为基础的。
正确使用序列化机制
一般而言,要使得一个类可以序列化,只需简单实现java.io.Serializable接口即可(还要实现无参数的构造方法)。该接口是一个标记式接口,它本身不包含任何内容,实现了该接口则表示这个类准备支持序列化的功能。如下例定义了类Person,并声明其可以序列化。
[java]
public class Person implements Serializable {
private static final long serialVersionUID = 1L;
private String name;;
private int age;
public Person(){
}
public Person(String str,int n){
System.out.println("Inside Person's Constructor");
name = str;
age = n;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
}
下面为三种格式转换的代码:
1.默认格式.
[java]
public class SerializeToFlatFile {
public static void main(String[] args) {
SerializeToFlatFile ser = new SerializeToFlatFile();
ser.savePerson();
ser.restorePerson();
}
public void savePerson(){
Person myPerson = new Person("Jay", 24);
try{
FileOutputStream fos = new FileOutputStream("E:\\person.txt");
ObjectOutputStream oos = new ObjectOutputStream(fos);
System.out.println("Person--Jay,24---Written");
oos.writeObject(myPerson);
oos.flush();
oos.close();
}catch(Exception e){
e.printStackTrace();
}
}
@SuppressWarnings("resource")
public void restorePerson(){
try{
FileInputStream fls = new FileInputStream("E:\\person.txt");
ObjectInputStream ois = new ObjectInputStream(fls);
Person myPerson = (Person)ois.readObject();
System.out.println("\n---------------------\n");
System.out.println("Person --read:");
System.out.println("Name is:"+myPerson.getName());
System.out.println("Age is :"+myPerson.getAge());
}catch(Exception e){
e.printStackTrace();
}
}
}
输出结果: sr test.serializable.Person I ageL namet Ljava/lang/String;xp t Jay
2.XML格式
[java]
//参考:http://www.cnblogs.com/bluesky5304/archive/2010/04/07/1706061.html
public class SerializeXML {
public static void main(String[] args) {
SerializeXML ser = new SerializeXML();
ser.serializeToXml();
ser.deSerializeFromXml();
}
public void serializeToXml(){
Person[] myPersons = new Person[2];
myPersons[0] = new Person("Jay", 24);
myPersons[1] = new Person("Tom", 23);
XStream xStream = new XStream();
xStream.alias("Person", Person.class);
try{
FileOutputStream foStream = new FileOutputStream("E:\\persons.xml");
xStream.toXML(myPersons,foStream);
}catch(Exception e){
e.printStackTrace();
}
}
public void deSerializeFromXml(){
XStream xStream = new XStream();
xStream.alias("Person", Person.class);
Person[] myPersons = null;
try{
FileInputStream flStream = new FileInputStream("E:\\persons.xml");
myPersons = (Person[])xStream.fromXML(flStream);
if(myPersons!=null){
for(Person person:myPersons){
&nbs
补充:软件开发 , Java ,