Hessian的学习

Hessian是一个轻量级的remoting onhttp工具，使用简单的方法提供了RMI的功能。 相比WebService，Hessian更简单、快捷。采用的是二进制RPC协议，因为采用的是二进制协议，所以它很适合于发送二进制数据。

1.下载相关jar包

<dependency>   <groupId>com.caucho</groupId>   <artifactId>hessian</artifactId>   <version>4.0.33</version></dependency>

2.编写接口和实现类
IHelloService：

package com.yingze.hessian;/**   * @ClassName: IHelloService * @Description: TODO() * @author liang * @date 2016年6月29日 上午9:38:47 * */public interface IHelloService {public String sayHello(String name);}

HelloServiceImpl：

package com.yingze.hessian;/**   * @ClassName: HelloServiceImpl * @Description: TODO() * @author liang * @date 2016年6月29日 上午9:39:33 * */public class HelloServiceImpl implements IHelloService {public String sayHello(String name) {return "hello:"+name;}}

3.spring-web包里提供的org.springframework.remoting.caucho.HessianServiceExporter类，可以将普通方法导出成hessian服务，配置如下：

hessian-context.xml：

<?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:context="http://www.springframework.org/schema/context"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xsi:schemaLocation="http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd       http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context.xsd       http://www.springframework.org/schema/aop       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd       http://www.springframework.org/schema/tx       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd       "><!--hessian--><bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"/><bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>        <bean id="helloServiceImpl" class="com.yingze.hessian.HelloServiceImpl"/>        <bean name="/hello" class="org.springframework.remoting.caucho.HessianServiceExporter">    <property name="service" ref="helloServiceImpl"/>    <property name="serviceInterface" value="com.yingze.hessian.IHelloService"/>    </bean></beans>

web.xml：

        <servlet><servlet-name>hessian</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath:hessian-context.xml</param-value>        </init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>hessian</servlet-name><url-pattern>/hessian/*</url-pattern></servlet-mapping>

4.配置客户端信息

hessian-client.xml：

<?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:context="http://www.springframework.org/schema/context"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xsi:schemaLocation="http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd       http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context.xsd       http://www.springframework.org/schema/aop       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd       http://www.springframework.org/schema/tx       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd       "><!--hessian client--><bean id="hessianClient" class="org.springframework.remoting.caucho.HessianProxyFactoryBean">        <property name="serviceUrl">            <value>http://localhost:8080/Struts2EasyuiDemo-web/hessian/hello</value>        </property>        <property name="serviceInterface">            <value>com.yingze.hessian.IHelloService</value>        </property>    </bean></beans>

5.启动tomcat，运行项目

6.测试的main方法

package com.yingze.hessian;import java.net.MalformedURLException;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.caucho.hessian.client.HessianProxyFactory;/**   * @ClassName: TestMain * @Description: TODO() * @author liang * @date 2016年6月29日 上午11:10:19 * */public class TestMain {/** * @param args * @throws ClassNotFoundException  * @throws MalformedURLException  */public static void main(String[] args) throws MalformedURLException, ClassNotFoundException {/*String url = "http://localhost:8080/Struts2EasyuiDemo-web/hessian/hello"; HessianProxyFactory f=new HessianProxyFactory();IHelloService hello=(IHelloService) f.create(IHelloService.class,url);String str=hello.sayHello("何先生");System.out.println(str);*/ApplicationContext context = new ClassPathXmlApplicationContext("hessian-client.xml");IHelloService hello = (IHelloService) context.getBean("hessianClient");        System.out.println(hello.sayHello("何先生"));}}