Hessian例子

1.      web项目名: HessianWeb ,需要的jar包：hessian.jar


2.      服务端程序列表：

包名：com.hessian.lsh

接口：Ihessian.java

接口实现类: HessianImpl.java

配置文件：web.xml


3.      客户端程序列表

包名:com.hessian.lsh

客户端程序：HessianTest.java



4.      源码

1)      Ihessian.java


    package com.hessian.lsh;

public interface IHessian {

    public String say(String msg);

}


2)      HessianImpl.java


    package com.hessian.lsh;

import com.caucho.hessian.server.HessianServlet;

public class HessianImpl extends HessianServlet implements IHessian {

private static final long serialVersionUID = 7619464791326509626L;

    public String say(String msg) {

   return "Hello " + msg;

    }

}


3)        web.xml


   <?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <servlet>

       <servlet-name>ihessian</servlet-name>

       <servlet-class>

           com.hessian.lsh.HessianImpl

       </servlet-class>

    </servlet>

    <servlet-mapping>

       <servlet-name>ihessian</servlet-name>

       <url-pattern>/hessian/ihessian</url-pattern>

    </servlet-mapping>

</web-app>


4)      HessianTest.java


   package com.hessian.lsh;


import java.net.MalformedURLException;


import com.caucho.hessian.client.HessianProxyFactory;

import com.hessian.lsh.IHessian;;

public class HessianTest {

    public static void main(String[] args) {

    String url = "http://localhost:8080/HessianWeb/hessian/ihessian";

       HessianProxyFactory factory = new HessianProxyFactory();

       IHessian h = null;

       try {

           h = (IHessian) factory.create(IHessian.class, url);

       } catch (MalformedURLException e) {

           System.out.println("occur exception: " + e);

       }

       System.out.println(h.say("MR liu"));

    }

}

客户端说明String url = "http://localhost:8080/HessianWeb/hessian/ihessian";

Localhost为本机地址，8080为tomcat使用的端口，HessianWeb部署在tomcat中的项目名，/hessian/ihessian为在web.xml中定义的url-pattern


项目说明

将HessianWeb部署到tomcat，启动tomcat，启动成功后，运行HessianTest.java类，在调试窗口将看到以下信息

Hello MR liu


如果没有启动tomcat，而直接运行HessianTest.java类，将出现以下异常：

java.net.ConnectException: Connection refused: connect

解决方法，启动tomcat，在重新运行HessianTest.java类


如果tomcat启动了，运行HessianTest.java类，出现以下异常：

java.io.IOException: Server returned HTTP response code: 400 for URL:

说明在HessianTest.java类中

String url = "http://localhost:8080/HessianWeb/hessian/ihessian";这句有问题，检查端口是否正确，项目名是否正确。