序列化 （实现RPC的基础）

public interface ISerializer {

    <T> byte[] serializer(T obj);

    <T> T deSerializer(byte[] data,Class<T> clazz);
}

　　

//java实现
public class JavaSerializer implements ISerializer {

    @Override
    public <T> byte[] serializer(T obj) {
        ObjectOutputStream objectOutputStream=null;
        try {
            objectOutputStream=new ObjectOutputStream(new FileOutputStream(new File("user")));
            objectOutputStream.writeObject(obj);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(objectOutputStream!=null){
                try {
                    objectOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

    @Override
    public <T> T deSerializer(byte[] data, Class<T> clazz) {
        ObjectInputStream objectInputStream=null;
        try {
            objectInputStream=new ObjectInputStream(new FileInputStream(new File("user")));
            return (T)objectInputStream.readObject();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } finally {
            if(objectInputStream!=null){
                try {
                    objectInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
}

　　fast

public class FastjsonSerializer implements ISerializer{

    @Override
    public <T> byte[] serializer(T obj) {
        return JSON.toJSONString(obj).getBytes();
    }

    @Override
    public <T> T deSerializer(byte[] data, Class<T> clazz) {
        return JSON.parseObject(new String(data),clazz);
    }
}

XML

public class XmlSerializer implements ISerializer{

    XStream xStream=new XStream(new DomDriver());

    @Override
    public <T> byte[] serializer(T obj) {
        return xStream.toXML(obj).getBytes();
    }

    @Override
    public <T> T deSerializer(byte[] data, Class<T> clazz) {
        return (T)xStream.fromXML(new String (data));
    }
}

protobuf实现较为麻烦，需要先生成对应的类。（可以百度如何使用protobuf进行序列化）

demo：

public class SuperClass implements Serializable {

    String sex;

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

　　

public class User extends SuperClass  {

    public static int num=5;

    private String name;
    private int age;

    private transient String hobby;

    //序列化对象
    private void writeObject(ObjectOutputStream objectOutputStream) throws IOException {
        objectOutputStream.defaultWriteObject();
        objectOutputStream.writeObject(hobby);
    }

    //反序列化
    private void readObject(ObjectInputStream objectInputStream) throws IOException, ClassNotFoundException {
        objectInputStream.defaultReadObject();
        hobby=(String)objectInputStream.readObject();
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public String getHobby() {
        return hobby;
    }

    public void setHobby(String hobby) {
        this.hobby = hobby;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", hobby='" + hobby + '\'' +
                '}';
    }
}

public class App 
{
    public static void main( String[] args ) {
        ISerializer iSerializer=new FastjsonSerializer();
        User user=new User();
        user.setAge(18);
        user.setName("Mic");
        user.setHobby("菲菲");
        user.setSex("男");

        byte[] rs=iSerializer.serializer(user);

        System.out.println(new String(rs));


        User user1=iSerializer.deSerializer(rs,User.class);
        System.out.println(user1+"->"+user1.getSex());





    }
}

public class Email implements Serializable {


    private String content;

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

public class Person implements Cloneable,Serializable {

    private String name;

    private Email email;

    public Person(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

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

    public Email getEmail() {
        return email;
    }

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

    @Override
    protected Person clone() throws CloneNotSupportedException {
        return (Person)super.clone();
    }

    public Person deepClone() throws IOException, ClassNotFoundException {
        ByteArrayOutputStream bos=new ByteArrayOutputStream();
        ObjectOutputStream objectOutputStream=
                new ObjectOutputStream(bos);
        objectOutputStream.writeObject(this);

        ByteArrayInputStream bis=new ByteArrayInputStream(bos.toByteArray());
        ObjectInputStream objectInputStream=new ObjectInputStream(bis);
        return (Person) objectInputStream.readObject();

    }
}

public class CloneDemo {

    public static void main(String[] args) throws CloneNotSupportedException, IOException, ClassNotFoundException {
        Email email=new Email();
        email.setContent("今天晚上20：00有课程");
        Person p1=new Person("Mic");
        p1.setEmail(email);

//        Person p2=p1.clone();
        Person p2=p1.deepClone();
        p2.setName("黑白");
        p2.getEmail().setContent("今天晚上是20：30上课");

        System.out.println(p1.getName()+"->"+p1.getEmail().getContent());
        System.out.println(p2.getName()+"->"+p2.getEmail().getContent());

    }
}

public class StoreRuleDemo {

    public static void main(String[] args) throws IOException {
        ObjectOutputStream outputStream=
                new ObjectOutputStream(new FileOutputStream(new File("user")));
        User user=new User();
        user.setAge(18);
        user.setName("Mic");
        user.setHobby("菲菲");
        user.setSex("男");
        outputStream.flush();
        outputStream.writeObject(user);
        System.out.println(new File("user").length());
        outputStream.writeObject(user);
        outputStream.flush();
        outputStream.close();
        System.out.println(new File("user").length());

    }
}