Hessian和Burlap都是基于HTTP的，他们都解决了RMI所头疼的防火墙渗透问题。但当传递过来的RPC消息中包含序列化对象时，RMI就完胜Hessian和Burlap了。
因为Hessian和Burlap都是采用了私有的序列化机制，而RMI使用的是
Java本身的序列化机制。如果数据模型非常复杂，那么Hessian/Burlap的序列化模型可能就无法胜任了。
Spring开发团队意识到RMI服务和基于HTTP的服务之前的空白，Spring的HttpInvoker应运而生。
Spring的HttpInvoker,它基于HTTP之上提供RPC,同时又使用了Java的对象序列化机制。
程序的具体实现
一、首先我们创建一个实体类，并实现Serializable接口
package entity; import java.io.Serializable; public class Fruit implements Serializable { private String name; private String color; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getColor() { return color; } public void setColor(String color) { this.color = color; } } |
二、创建一个接口
package service;
import java.util.List;
import entity.Fruit;
public interface FruitService {
List<Fruit> getFruitList();
}
三、创建一个类，并实现步骤二中的接口
package service.impl; import java.util.ArrayList; import java.util.List; import service.FruitService; import entity.Fruit; public class FruitServiceImpl implements FruitService { public List<Fruit> getFruitList() { List<Fruit> list = new ArrayList<Fruit>(); Fruit f1 = new Fruit(); f1.setName("橙子"); f1.setColor("黄色"); Fruit f2 = new Fruit(); f2.setColor("红色"); list.add(f1); list.add(f2); return list; } } |
四、在WEB-INF下的web.xml中配置SpringMVC需要的信息
<context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>springMvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet </servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> |
五、在applicationContext.xml配置需要导出服务的bean信息
<bean id="furitService" class="service.impl.FruitServiceImpl"></bean>
<bean id="FuritService"
class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter"
p:serviceInterface="service.FruitService" p:service-ref="furitService" />
六、在WEB-INF下创建springMvc-servlet.xml文件，并配置urlMapping
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/fruitService">FuritService</prop> </props> </property> </bean> </beans> |
七、在applicationContext.xml编写客户端所需要获得服务的bean信息
<bean id="getFruitService"
class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean"
p:serviceInterface="service.FruitService"
p:serviceUrl="http://localhost:8080/SpringHttpInvoker/fruitService" />
八、编写测试代码
package test; import java.util.List; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import entity.Fruit; import service.FruitService; public class Test { public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext( "applicationContext.xml"); FruitService fruitService = (FruitService) ctx .getBean("getFruitService"); List<Fruit> fruitList = fruitService.getFruitList(); for (Fruit fruit : fruitList) { System.out.println(fruit.getColor() + "的" + fruit.getName()); } } } |
将项目部署到Tomcat上，启动Tomcat服务，并运行测试代码
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