Spring remote processing (through Burlap example)Example of remote processing via HTTP call in Spring

Spring remote processing (through Hessian example)

With HessianServiceExporter and HessianProxyFactoryBean class, we can implement the remote service provided by hessian.

Advantages of Hessian

Hessian works well on the entire firewall. Hessian is portable and can be integrated with other languages such as PHP and .Net.

Example of Hessian remote processing

You need to create the following files to create a simple hessian application:

Calculation.java CalculationImpl.java web.xml hessian-servlet.xml client-beans.xml Client.java

1, Calculation.java

This is a simple interface that contains a method for multidimensional datasets.

Example

package com.w3codebox;
public　interface　Calculation　{
int　cube(int　number);
}

2, CalculationImpl.java

This class provides the implementation of the Calculation interface.

Example

package com.w3codebox;
public　class　CalculationImpl　implements　Calculation{
　　　　public　int　cube(int　number)　{
　　　　　　　　return　number*number*number;
　　　　}
}

3, web.xml

In this xml file, we define DispatcherServlet as the front controller. If any request follows the .http extension, it will be forwarded to DispatcherServlet.

Example

<?xml version="1.0" encoding="UTF-8"?>
<web-app　version="2.5"　
　　　　xmlns="http://java.sun.com/xml/ns/javaee"　
　　　　xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"　
　　　　xsi:schemaLocation="http://java.sun.com/xml/ns/javaee　
　　　　http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
　　
　　　　<servlet>
　　　　<servlet-name>hessian</servlet-name>
　　　　<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
　　　　<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
　　　　<servlet-name>hessian</servlet-name>
　　　　<url-pattern>*.http</url-pattern>
</servlet-mapping>
</web-app>

4, hessian-servlet.xml

Must be in WEB-Created in the INF folder. Its name must be servletname-servlet.xml. It provides CalculationImpl and HessianServiceExporter defines the bean.

Example

<?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.xsd">
　　　　
<bean id="calculationBean" class="com.w3codebox.CalculationImpl"></bean>
<bean name="/Calculation.http"　
class="org.springframework.remoting.caucho.HessianServiceExporter">
　　　　<property name="service" ref="calculationBean"></property>
　　　　<property name="serviceInterface" value="com.w3codebox.Calculation"></property>
</bean>
</beans>

5、client-beans.xml

In this xml file, we have HessianProxyFactoryBean defines the bean. You need to define two properties of this class.

serviceUrl serviceInterface

Example

<?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.xsd">
　　　　
<bean id="calculationBean"　
class="org.springframework.remoting.caucho.HessianProxyFactoryBean">
　　　　<property name="serviceUrl"　
　　　　　　　　　value="http://localhost:8888/hessian/Calculation.http"></property>
　　　　<property name="serviceInterface" value="com.w3codebox.Calculation"></property>
</bean>
</beans>

In this example, the name of our project is hessian, which is used as the context root in the serviceURL.

6Client.java

This class retrieves an instance of Calculation and calls the multidimensional dataset method.

Example

package com.w3codebox;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Client {
　public static void main(String[] args){
　　ApplicationContext context = new ClassPathXmlApplicationContext("client-beans.xml);
　　Calculation calculation = (Calculation)context.getBean("calculationBean");
　　System.out.println(calculation.cube(5));
　}
}

How to run this example

Start and deploy the project, here we assume the server is running on8888running on the port number. If the port number is different, please change the client-serviceURL in beans.xml.

Then, compile and run the Client.java file.

Spring remote processing (through Burlap example)Example of remote processing via HTTP call in Spring

Spring Tutorial

Spring remote processing (through Hessian example)

Example of Hessian remote processing

How to run this example