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jar,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:

[java] view plaincopyprint?

1. package com.wtang.isay;  
2.   
3. public interface Isay {  
4.     public String sayHello(String arg1,String arg2);  
5. }  

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)

[java] view plaincopyprint?

1. package com.wtang.isay;  
2.   
3. public class IsayImpl implements Isay {  
4.   
5.     public String sayHello(String arg1, String arg2) {  
6.         return "Hello:" + arg1 + arg2;  
7.     }  
8. }  

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]

 

[java] view plaincopyprint?

1. <servlet>  
2.     <servlet-name>hello</servlet-name>  
3.     <!-- 配置Hessian的Servlet -->  
4.     <servletclass>com.caucho.hessian.server.HessianServlet</servlet-class>  
5.     <init-param>  
6.         <param-name>service-class</param-name>  
7.         <param-value>com.wtang.isay.IsayImpl</param-value>  
8.     </init-param>  
9. </servlet>  
10.   
11. <servlet-mapping>  
12.     <servlet-name>hello</servlet-name>  
13.     <url-pattern>/hello</url-pattern>  
14. </servlet-mapping>  

<servlet><servlet-name>hello</servlet-name><!-- 配置Hessian的Servlet --><servletclass>com.caucho.hessian.server.HessianServlet</servlet-class><init-param><param-name>service-class</param-name><param-value>com.wtang.isay.IsayImpl</param-value></init-param></servlet><servlet-mapping><servlet-name>hello</servlet-name><url-pattern>/hello</url-pattern></servlet-mapping>

 

 

 

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

 

[java] view plaincopyprint?

1. <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>  
2. <%@ page import="com.caucho.hessian.client.HessianProxyFactory"%>  
3. <%@ page import="com.wtang.isay.Isay"%>  
4.   
5. <%  
6.     //Hessian代理工厂   
7.     HessianProxyFactory factory = new HessianProxyFactory();  
8.     //获得访问配置的Servlet路径   
9.     String url=("http://"+request.getServerName()+":"+request.getServerPort()  
10.     +request.getContextPath()+"/hello");  
11.       
12.     System.out.println(url);  
13.       
14.     //使用Hessian工厂获得接口的具体实现类   
15.     Isay i = (Isay)factory.create(Isay.class,url);  
16.       
17.     out.println("<h2>"+i.sayHello("chen","weitang")+"<h2>");  
18. %>  

<%@ 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.getContextPath()+"/hello");System.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