Example of Remoting by Hessian

迈不过友情╰ 2022-08-12 02:59 12阅读 0赞

You need to create following files for creating a simple hessian application:

1.  **Calculation.java**
2.  **CalculationImpl.java**
3.  **web.xml**
4.  **hessian-servlet.xml**
5.  **client-beans.xml**
6.  **Client.java**

**1) Calculation.java**

It is the simple interface containing one method cube.

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1.  package com.javatpoint;  
2.  public interface Calculation \{  
3.  int cube(int number);  
4.  \}

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

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**2) CalculationImpl.java**

This class provides the implementation of Calculation interface.

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1.  package com.javatpoint;  
2.  public class CalculationImpl implements Calculation\{  
3.      public int cube(int number) \{  
4.          return number\*number\*number;  
5.      \}  
6.  \}

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

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**3) web.xml**

In this xml file, we are defining DispatcherServlet as the front controller. If any request is followed by .http extension, it will be forwarded to DispatcherServlet.

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1.  <?xml version="1.0" encoding="UTF-8"?>  
2.  <web-app version="2.5"   
3.      xmlns="http://java.sun.com/xml/ns/javaee"   
4.      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
5.      xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   
6.      http://java.sun.com/xml/ns/javaee/web-app\_2\_5.xsd">  
7.      
8.      <servlet>  
9.      <servlet-name>hessian</servlet-name>  
10.     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
11.     <load-on-startup>1</load-on-startup>  
12. </servlet>  
13.   
14. <servlet-mapping>  
15.     <servlet-name>hessian</servlet-name>  
16.     <url-pattern>\*.http</url-pattern>  
17. </servlet-mapping>  
18.   
19. </web-app>

<?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>

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**4) hessian-servlet.xml**

It must be created inside the WEB-INF folder. Its name must be servletname-servlet.xml. It defines bean for **CalculationImpl** and **HessianServiceExporter**.

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1.  <?xml version="1.0" encoding="UTF-8"?>  
2.  <beans xmlns="http://www.springframework.org/schema/beans"  
3.      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
4.      xsi:schemaLocation="http://www.springframework.org/schema/beans   
5.      http://www.springframework.org/schema/beans/spring-beans.xsd">  
6.        
7.  <bean id="calculationBean" class="com.javatpoint.CalculationImpl"></bean>  
8.  <bean name="/Calculation.http"   
9.  class="org.springframework.remoting.caucho.HessianServiceExporter">  
10.     <property name="service" ref="calculationBean"></property>  
11.     <property name="serviceInterface" value="com.javatpoint.Calculation"></property>  
12. </bean>  
13.   
14. </beans>

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

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**5) client-beans.xml**

In this xml file, we are defining bean for **HessianProxyFactoryBean**. You need to define two properties of this class.

1.  serviceUrl
2.  serviceInterface

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1.  <?xml version="1.0" encoding="UTF-8"?>  
2.  <beans xmlns="http://www.springframework.org/schema/beans"  
3.      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
4.      xsi:schemaLocation="http://www.springframework.org/schema/beans   
5.  http://www.springframework.org/schema/beans/spring-beans.xsd">  
6.        
7.  <bean id="calculationBean"   
8.  class="org.springframework.remoting.caucho.HessianProxyFactoryBean">  
9.      <property name="serviceUrl"   
10.          value="http://localhost:8888/hessian/Calculation.http"></property>  
11.     <property name="serviceInterface" value="com.javatpoint.Calculation"></property>  
12. </bean>  
13. </beans>

<?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.javatpoint.Calculation"></property> </bean> </beans>

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

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**6) Client.java**

This class gets the instance of Calculation and calls the cube method.

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1.  package com.javatpoint;  
2.  import org.springframework.context.ApplicationContext;  
3.  import org.springframework.context.support.ClassPathXmlApplicationContext;  
4.    
5.  public class Client \{  
6.   public static void main(String\[\] args)\{  
7.    ApplicationContext context = new ClassPathXmlApplicationContext("client-beans.xml");  
8.    Calculation calculation = (Calculation)context.getBean("calculationBean");  
9.    System.out.println(calculation.cube(5));  
10.  \}  
11. \}

package com.javatpoint; 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)); \} \}

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### How to run this example ###

Start and deploy the project, here we are assuming that server is running on 8888 port number. If the port number is different, change the serviceURL in client-beans.xml.

Then, Compile and Run the Client.java file.

[download this example (developed using Myeclipse IDE)][download this example _developed using Myeclipse IDE]

[copy to clipboard]: http://www.javatpoint.com/spring-remoting-by-hessian-example#
[download this example _developed using Myeclipse IDE]: http://www.javatpoint.com/src/sp/hessian.zip