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Spring Tutorial

Spring stream

Xstream It is a library used to serialize objects to xml and vice versa without any mapping file. Note that castor requires a mapping file.

XStreamMarshaller The class provides the functionality to marshal objects to xml and vice versa.

Example of Spring and Xstream integration (marshalling Java objects to XML)

You need to use Xstream to create the following files through Spring for Java object marshalling to XML:

Employee.java applicationContext.xml Client.java

Required Jar files

To run this example, you need to load:

Spring Core jar file Spring Web jar file xstream-1.3.jar

Download all jar files of spring, including core, web, aop, mvc, j2ee, remoting, oxm, jdbc, orm, etc.

Download xstream-1.3.jar

Employee.java

If three properties id, setter and getters of salary are defined.

package com.w3codebox;
public class Employee {
private int id;
private String name;
private float salary;
public int getId() {
　　　　return id;
}
public void setId(int id) {
　　　　this.id = id;
}
public String getName() {
　　　　return name;
}
public void setName(String name) {
　　　　this.name = name;
}
public float getSalary() {
　　　　return salary;
}
public void setSalary(float salary) {
　　　　this.salary = salary;
}
}

applicationContext.xml

It defines a Bean named xstreamMarshallerBean, where the Employee class is bound to the OXM framework.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
　　　　xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
　　　　xsi:schemaLocation="http://www.springframework.org/schema/beans　
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
　　　　
<bean id="xstreamMarshallerBean" class="org.springframework.oxm.xstream.XStreamMarshaller">
　　　　<property name="annotatedClasses" value="com.w3codebox.Employee"></property>
</bean>
</beans>

Client.java

It retrieves an instance of Marshaller from the applicationContext.xml file and calls the marshal method.

package com.w3codebox;
import java.io.FileWriter;
import java.io.IOException;
import javax.xml.transform.stream.StreamResult;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.oxm.Marshaller;
public class Client{
　public static void main(String[] args) throws IOException{
　　ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
　　Marshaller marshaller = (Marshaller)context.getBean("xstreamMarshallerBean");
　　　　　　　　
　　Employee employee = new Employee();
　　employee.setId(101);
　　employee.setName("Sonoo　Jaiswal");
　　employee.setSalary(100000);
　　　　　　　　
　　marshaller.marshal(employee, new StreamResult(new FileWriter("employee.xml")));
　　
　　System.out.println("XML Created Successfully");
　}
}

Example Output

employee.xml 

<com.w3codebox.Employee>
<id>101</id>
<name>Sonoo　Jaiswal</name>
<salary>100000.0</salary>
</com.w3codebox.Employee>
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