Hessian入门案例

1.1. Hessian简介

Hessian: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，因为采用了二进制协议，所以它很适合于发送二进制数据，Hessian主要作面向对象的消息通信。

1.2. 开发步骤

1.2.1. 导入jar包

去官网下载http://hessian.caucho.com/

1.2.2. 编写远程接口

Ihello.java

package cn.tempus.hessian; public interface IHello { public String sayHello(String name); }

1.2.3. 编写远程接口实现类

HelloImpl.java需要继承HessianServlet

package cn.tempus.hessian; import com.caucho.hessian.server.HessianServlet; public class HelloImpl extends HessianServlet implements IHello { private static final long serialVersionUID = -6448991611447150108L; public String sayHello(String name) { return "Hello: "+name; } }

1.2.4. Web.xml文件中配置servlet

Web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>HessianDemo</display-name> <servlet> <servlet-name>Hello</servlet-name> <servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class> <init-param> <param-name>home-class</param-name> <param-value>cn.tempus.hessian.HelloImpl</param-value> </init-param> <init-param> <param-name>home-api</param-name> <param-value>cn.tempus.hessian.IHello</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Hello</servlet-name> <url-pattern>/Hello</url-pattern> </servlet-mapping> </web-app>

1.2.5. 编写客户端

Client.java

package cn.tempus.hessian; import java.net.MalformedURLException; import com.caucho.hessian.client.HessianProxyFactory; public class Client { public static String url = "http://127.0.0.1:8080/HessianDemo/Hello"; public static void main(String[] args) { HessianProxyFactory factory = new HessianProxyFactory(); try { IHello iHello = (IHello) factory.create(IHello.class, url); System.out.println(iHello.sayHello("morris")); } catch (MalformedURLException e) { e.printStackTrace(); } } }

1.2.6. 发布项目到jetty

Jetty后台打印

Running Jetty 6.1.26 2014-12-29 16:09:27.234:INFO::Logging to STDERR via org.mortbay.log.StdErrLog ParentLoaderPriority enabled Context path:/HessianDemo ProjectClassLoader: entry=D:\Morris\javaPrj\HessianDemo\build\classes ProjectClassLoader: entry=D:\Morris\javaPrj\HessianDemo\WebContent\WEB-INF\lib\hessian-4.0.37.jar 2014-12-29 16:09:27.500:INFO::jetty-6.1.26 2014-12-29 16:09:29.328:INFO::Started SelectChannelConnector@0.0.0.0:8080

1.2.7. 运行客户端

结果如下:

Hello: morris