Hessian简单入门

Hessian是一个简单的连接Web服务的二进制协议。

Hessian概述:

一.客户端和服务端不依赖于其他任何jar,比起webService 它显得轻量许多,比如使用xfire包含核心库和客户端的大小达到了10M,而最新的hessian-4.0.7 jar大小也只有不到400K.

二.更适合二进制的传输,比起webService.Hessian的传输速度要高于webService.

三.支持Java,c#,Flex(actionscrpit)

一. 添加Hessian的jar于Web-Inf下. 这里使用的是hessian-4.0.7,下载地址: http://download.csdn.net/source/3159260

二. 定制供客户端调用的接口:

package com.wtang.isay; public interface Isay { public String sayHello(String arg1,String arg2); }

三. 接口具体实现(如果使用了pojo类,pojo类必须实现序列化)

package com.wtang.isay; public class IsayImpl implements Isay { public String sayHello(String arg1,String arg2) { return "Hello:" + arg1 + arg2; } }

四. 配置Hessian的Servlet[类似于配置webService的service.xml]

<servlet> <servlet-name>hello</servlet-name>  <servletclass>com.caucho.hessian.server.HessianServlet</servlet-class> <init-p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m> <p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m-name>service-class</p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m-name> <p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m-value>com.wtang.isay.IsayImpl</p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m-value> </init-p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>m> </servlet> <<a href="/tag/servletmapping/" target="_blank" class="keywords">servlet-mapping</a>> <servlet-name>hello</servlet-name> <url-pattern>/hello</url-pattern> </<a href="/tag/servletmapping/" target="_blank" class="keywords">servlet-mapping</a>>

五. 书写服务端的测试jsp页面[HessianProxyFactory类似于xifre的XFireProxyFactory]

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page import="com.caucho.hessian.client.HessianProxyFactory"%> <%@ page import="com.wtang.isay.Isay"%> <% //Hessian代理工厂 HessianProxyFactory factory = new HessianProxyFactory(); //获得访问配置的Servlet路径 String url=("http://"+request.getServerName()+":"+request.getServerPort() +request.get<a href="/tag/contextpath/" target="_blank" class="keywords">contextpath</a>()+"/hello"); Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.out.println(url); //使用Hessian工厂获得接口的具体实现类 Isay i = (Isay)factory.create(Isay.class,url); out.println("<h2>"+i.sayHello("chen","weitang")+"<h2>"); %>

输出Hello:cheweitang

六.客户端调用:

package com.wtang.test; import java.net.MalformedURLException; import com.caucho.hessian.client.HessianProxyFactory; import com.wtang.isay.Isay; public class Test { public static void main(String[] args) throws MalformedURLException { // Hessian代理工厂 HessianProxyFactory factory = new HessianProxyFactory(); // 访问配置的Servlet路径 String url = "http://localhost:8080/HessianF<a href="/tag/irs/" target="_blank" class="keywords">irs</a>t/hello"; // 使用Hessian工厂获得接口的具体实现类 Isay i = (Isay) factory.create(Isay.class,url); Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.out.println(i.sayHello("chen","weitang")); } }

输出Hello:chenweitang

相比起webService 是不是轻量级许多呢?

---2011年4月4日 23:09:19

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