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Commit49d36b9

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another serialization example
1 parent0cdd340 commit49d36b9

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5 files changed

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packagelearnHeadFirstJava.another_serialization_example;
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importjava.io.FileInputStream;
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importjava.io.IOException;
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importjava.io.ObjectInputStream;
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publicclassDeseriliazeDemo {
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privatestaticfinalStringFILE_DIRECTORY ="/tmp/employee.ser";
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staticEmployeee =null;
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publicstaticvoidmain(String[]args) {
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try {
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FileInputStreamfis =newFileInputStream(FILE_DIRECTORY);
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ObjectInputStreamois =newObjectInputStream(fis);
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e = (Employee)ois.readObject();
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ois.close();
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fis.close();
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}catch (IOExceptione) {
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System.out.println("Caught IOException");
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e.printStackTrace();
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return;
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}catch (ClassNotFoundExceptione) {
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System.out.println("Employee class not found");
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e.printStackTrace();
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return;
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}
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System.out.println("Deserialized employee.ser is: " +e.toString() +".");
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}
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}
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packagelearnHeadFirstJava.another_serialization_example;
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importjava.io.Serializable;
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importorg.springframework.stereotype.Component;
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importorg.springframework.stereotype.Repository;
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importorg.springframework.stereotype.Service;
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importlombok.Getter;
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importlombok.RequiredArgsConstructor;
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importlombok.Setter;
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//Any one of the following three annotations: @Service, @Repository and @Component will work fine here since I'm doing a component-scan.
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//@Component
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//@Repository
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@Service
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@RequiredArgsConstructor
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publicclassEmployeeimplementsSerializable {
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@Setter
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@Getter
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privateStringaddress;
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@Setter
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@Getter
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privateStringname;
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@Setter
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@Getter
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privateintage;
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@Setter
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@Getter
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privatedoublesalary;
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@Setter
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@Getter
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privatetransientintSSN;// any field that cannot be serialized needs to be
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// marked as transient, for demo purpose, we
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// just set SSN as a non-serializable field, it
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// doesn't mean anything, it's just that we
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// don't want to serialize it.
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publicvoidmailCheck() {
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System.out.println("Mailing a check to " +name +" at " +address);
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}
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@Override
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publicStringtoString() {//this toString() method doesn't contain SSN field either.
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return"Employee [address=" +address +", name=" +name +", age="
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+age +", salary=" +salary +"]";
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}
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}
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packagelearnHeadFirstJava.another_serialization_example;
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importjava.io.FileInputStream;
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importjava.io.FileOutputStream;
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importjava.io.IOException;
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importjava.io.ObjectInputStream;
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importjava.io.ObjectOutputStream;
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importorg.springframework.context.support.AbstractApplicationContext;
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importorg.springframework.context.support.ClassPathXmlApplicationContext;
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/**
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* This is a combo class that combines the other two classes together:
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* SerializeDemo and DeserializeDemo, makes it easier to read and play with.
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*/
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publicclassMainApp {
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privatestaticfinalStringFILE_DIRECTORY ="/tmp/employee.ser";
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publicstaticvoidmain(String[]args) {
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AbstractApplicationContextcontext =newClassPathXmlApplicationContext(
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"spring-configuration/serialization-spring-configuration.xml");
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Employeeemployee = (Employee)context.getBean("employee");
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// Employee employee = new Employee();//I don't need this line any more,
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// since I quickly set up a component-scan using Spring to auto wire
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// this employee bean for me, this is so cool! I feel so at home with
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// Spring dependency injection now! Praise the Lord!a
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employee.setName("Steve Sun");
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employee.setAge(26);
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employee.setAddress("1860 Charmeran Ave, San Jose, USA. 2015/08/08");
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employee.setSSN(12345678);
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employee.setSalary(103000);
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try {
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FileOutputStreamfos =newFileOutputStream(FILE_DIRECTORY);
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ObjectOutputStreamous =newObjectOutputStream(fos);
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ous.writeObject(employee);
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ous.close();
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fos.close();
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System.out.println("Serialized data is saved in " +FILE_DIRECTORY
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+".");
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}catch (IOExceptione) {
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e.printStackTrace();
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}
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Employeeemp =null;
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try {
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FileInputStreamfis =newFileInputStream(FILE_DIRECTORY);
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ObjectInputStreamois =newObjectInputStream(fis);
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emp = (Employee)ois.readObject();
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ois.close();
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fis.close();
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}catch (IOExceptione) {
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System.out.println("Caught IOException");
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e.printStackTrace();
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return;
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}catch (ClassNotFoundExceptione) {
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System.out.println("Employee class not found");
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e.printStackTrace();
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return;
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}
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System.out.println("Deserialized employee.ser is: " +emp.toString()
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+".");
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}
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}
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packagelearnHeadFirstJava.another_serialization_example;
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importjava.io.FileOutputStream;
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importjava.io.IOException;
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importjava.io.ObjectOutputStream;
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importorg.springframework.context.support.AbstractApplicationContext;
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importorg.springframework.context.support.ClassPathXmlApplicationContext;
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/**
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* Java provides a mechanism, called object serialization where an object can be
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* represented as a sequence of bytes that includes the object's data as well as
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* information about the object's type and the types of data stored in the
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* object.
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*
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* After a serialized object has been written into a file, it can be read from
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* the file and deserialized that is, the type information and bytes that
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* represent the object and its data can be used to recreate the object in
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* memory.
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*
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* Most impressive is that the entire process is JVM independent, meaning an
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* object can be serialized on one platform and deserialized on an entirely
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* different platform.
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*
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* Classes ObjectInputStream and ObjectOutputStream are high-level streams that
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* contain the methods for serializing and deserializing an object.
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*
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* The ObjectOutputStream class contains many write methods for writing various
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* data types, but one method in particular stands out:
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*
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* public final void writeObject(Object x) throws IOException
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*
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* The above method serializes an Object and sends it to the output stream.
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* Similarly, the ObjectInputStream class contains the following method for
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* deserializing an object:
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*
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* public final Object readObject() throws IOException, ClassNotFoundException
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*
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* This method retrieves the next Object out of the stream and deserializes it.
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* The return value is Object, so you will need to cast it to its appropriate
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* data type.
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*/
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publicclassSerializeDemo {
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privatestaticfinalStringFILE_DIRECTORY ="/tmp/employee.ser";
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publicstaticvoidmain(String[]args) {
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AbstractApplicationContextcontext =newClassPathXmlApplicationContext(
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"spring-configuration/serialization-spring-configuration.xml");
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Employeeemployee = (Employee)context.getBean("employee");
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// Employee employee = new Employee();//I don't need this line any more,
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// since I quickly set up a component-scan using Spring to auto wire
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// this employee bean for me, this is so cool! I feel so at home with
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// Spring dependency injection now! Praise the Lord!a
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employee.setName("Steve Sun");
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employee.setAge(26);
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employee.setAddress("1860 Charmeran Ave, San Jose, USA.");
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employee.setSSN(12345678);
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employee.setSalary(103000);
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try {
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FileOutputStreamfos =newFileOutputStream(FILE_DIRECTORY);
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ObjectOutputStreamous =newObjectOutputStream(fos);
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ous.writeObject(employee);
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ous.close();
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fos.close();
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System.out.println("Serialized data is saved in " +FILE_DIRECTORY
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+".");
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}catch (IOExceptione) {
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e.printStackTrace();
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}
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<beansxmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="http://www.springframework.org/schema/beans
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http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
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http://www.springframework.org/schema/context
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http://www.springframework.org/schema/context/spring-context-3.0.xsd">
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<context:component-scanbase-package="learnHeadFirstJava.another_serialization_example"/>
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</beans>

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