【RPC】使用Hessian构建RPC的简单示例

服务接口和实现

public interface HelloService {
    // 服务方法
    String sayHello(String name);
}

public class HelloServiceImpl implements HelloService {

    public String sayHello(String name) {
        return "RPC > Hello , " + name;
    }

}

Maven引用

<Hessian.version>4.0.38</Hessian.version>
<!--hessian start -->
	<dependency>
		<groupId>com.caucho</groupId>
		<artifactId>hessian</artifactId>
		<version>${Hessian.version}</version>
	</dependency>
<!--hessian end -->

web.xml配置

配置HessianServlet

<!--HessianServlet start -->
<servlet>
	<!-- 配置 HessianServlet -->
	<servlet-name>helloService</servlet-name>
	<servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>

	<!-- 配置接口的具体实现类 -->
	<init-param>
		<param-name>service-class</param-name>
		<param-value>com.ll.rpc.HelloServiceImpl</param-value>
	</init-param>
</servlet>
<!-- 映射 HessianServlet的访问URL地址 -->
<servlet-mapping>
	<servlet-name>helloService</servlet-name>
	<url-pattern>/helloService</url-pattern>
</servlet-mapping>
<!--HessianServlet end -->

Tomcat配置

1. 下载Tomcat：使用版本6.0.51;
2. 配置环境变量:CATALINA_HOME=D:\xxx\apache-tomcat-6.0.51;
3. 配置Javaweb为tomcat默认项目:
   
   修改server.xml，添加：可参见【Jersey】基于Jersey构建Restful Web应用

<Context path="" docBase="D:\xxx\target\Javaweb" debug="0" reloadable="true"/>

Clinet客户端实现

package com.ll.rpc;

import java.net.MalformedURLException;

import com.caucho.hessian.client.HessianProxyFactory;

public class Client {
	public static void main(String[] args) {
		// 远程Hessian服务
		String url = "http://localhost:8080/helloService";
		try {
			// 利用hessianProxyFactory.create()方法创建一个代理对象
			HelloService helloService = (HelloService) (new HessianProxyFactory()
					.create(HelloService.class, url));

			// 调用服务方法
			System.out.println(helloService.sayHello("sssppp"));
		} catch (MalformedURLException e) {

		}
	}
}

输出结果测试：

RPC > Hello , sssppp

其他

参考链接：

常用RPC框架及一个简单的RPC框架实现

完整的web.xml如下：

可参见【Jersey】基于Jersey构建Restful Web应用

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
	version="2.4">
	<display-name>Java Web</display-name>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

	<!--Spring 文件路径 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:conf/beans/beans-*.xml</param-value>
	</context-param>

	<!-- spring上下文监听器 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<listener>
		<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
	</listener>

	<!-- 解决中文乱码 -->
	<filter>
		<filter-name>SetCharacterEncoding</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>false</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>SetCharacterEncoding</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<!-- jersey Servlet start -->
	<servlet>
		<servlet-name>rest-inside</servlet-name>
		<servlet-class>com.sun.jersey.spi.spring.container.servlet.SpringServlet</servlet-class>
		<init-param>
			<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
			<param-value>true</param-value>
		</init-param>
		<!-- 设置Restful实例的位置 -->
		<init-param>
			<param-name>com.sun.jersey.config.property.packages</param-name>
			<param-value>com.ll.jersey</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>rest-inside</servlet-name>
		<url-pattern>/jersey/rest/*</url-pattern>
	</servlet-mapping>
	<!-- jersey Servlet end -->

	<!--HessianServlet start -->
	<servlet>
		<!-- 配置 HessianServlet -->
		<servlet-name>helloService</servlet-name>
		<servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>

		<!-- 配置接口的具体实现类 -->
		<init-param>
			<param-name>service-class</param-name>
			<param-value>com.ll.rpc.HelloServiceImpl</param-value>
		</init-param>
	</servlet>
	<!-- 映射 HessianServlet的访问URL地址 -->
	<servlet-mapping>
		<servlet-name>helloService</servlet-name>
		<url-pattern>/helloService</url-pattern>
	</servlet-mapping>
	<!--HessianServlet end -->

</web-app>