一个简单的利用Hessian在Java和C#之间通信的例子，服务端为Java，客户端为C#。

资源下载

先要准备好C#和Java的第三方类库：http://hessian.caucho.com/

hessian-4.0.37.jar

Hessian服务端

打开eclipse创建一个Dynamic Web Project，将hessian-4.0.37.jar放到lib下，大概如图所示：

创建一个接口：Hello.java

package hessian.test.server;

import hessian.test.client.HelloBean;

public interface Hello {

    public String sayHello(String smt);

    public void printHello(String smt);

    public void sayHello2(int bean);

    public HelloBean sayHello3(HelloBean bean);

}

Hello接口的一个实现：HelloImpl.java

package hessian.test.server;

import hessian.test.client.HelloBean;

public class HelloImpl implements Hello {

    public String sayHello(String smt) {

        return smt != null ? "hello " + smt : "hello hessian";

    }

    public void printHello(String smt) {

        System.out.println("Hello " + smt);

    }

    //不能有重载

    public void sayHello2(int bean) {

        System.out.println(bean);

    }

    public HelloBean sayHello3(HelloBean bean) {

        HelloBean result=new HelloBean();

        result.setName("cyy");

        System.out.print(bean.getName());

        return result;

    }

}

一个Java Bean:HelloBean.java

package hessian.test.client;

import java.io.Serializable;

//该类必须实现Serializable接口，能进行序列化。

public class HelloBean implements Serializable{

    private String name;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

web.xml内容：

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    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>hessian server</display-name>

    <servlet>

        <servlet-name>hessian</servlet-name>

        <servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>

        <init-param>

            <param-name>service-class</param-name>

            <param-value>hessian.test.server.HelloImpl</param-value>

        </init-param>

    </servlet>

    <servlet-mapping>

        <servlet-name>hessian</servlet-name>

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

    </servlet-mapping>

</web-app>

Hessian客户端

打开Visual Studio创建一个C#控制台程序，引用Hessiancharp.dll，大概如图所示：

定义一个与服务端对应Hello接口：Hello.cs

using System;

namespace hessian.test.client

{

    interface Hello

    {

        string sayHello(string smt);

        void printHello(string smt);

        void sayHello2(int bean);

        HelloBean sayHello3(HelloBean bean);

    }

}

一个与服务端HelloBean对应的HelloBean.cs:

using System;

//需要相同的命名空间

namespace hessian.test.client

{

    //该类必须和Hessian服务端中Java类一致

    public class HelloBean

    {

        //字段名相同

        private String name;

        //具有相同的geter和seter

        public String getName()

        {

            return name;

        }

        public void setName(String name)

        {

            this.name = name;

        }

    }

}

测试代码：Program.cs

using System;

using hessiancsharp.client;

namespace hessian.test.client

{

    class Program

    {

        static void Main(string[] args)

        {

            string url = @"http://localhost:8080/HessianServer/hessian";

            CHessianProxyFactory factory = new CHessianProxyFactory();

            Hello test = (Hello)factory.Create(typeof(Hello), url);

            Console.WriteLine(test.sayHello("zhanjindong"));//打印从服务器端获取的字符串

            test.printHello("Hessian"); //在服务器端控制台打印 "Hello Hessian"

            test.sayHello2();

            //传递对象

            HelloBean bean = new HelloBean();

            bean.setName("zhanjindong");

            HelloBean result = test.sayHello3(bean);

            Console.WriteLine(result.getName());

        }

    }

}

测试结果：

注意事项

示例还是很简单的，但是有几点需要注意的：

接口方法不能重载

public interface Hello {

    public void printHello(String smt);

    public String sayHello(String smt);

    public void sayHello2(int bean);

    public HelloBean sayHello3(HelloBean bean);

}

sayHello和sayHello2必须名称不一样。