簡單的Hessian demo

     接到通知會在公司閒置一個月，真是開心啊！終於有時間研究研究新東西給自己充充電了~，hessian是我接觸過的最爲簡單的遠程調用框架，聽各位大大說效率也還不錯，好處也一大堆。俺就不說廢話了~

先寫一個接口，將來要給客戶端調用的

java 代碼

package hessian.service;

/**
 *
 * @author absolute
 */
public interface HessianService {

    public String sayHello();
}

然後再寫個類實現這個接口

java 代碼

package hessian.service;

import com.caucho.hessian.server.HessianServlet;

/**
 *
 * @author alsolute
 */
public class HessianServiceImpl extends HessianServlet implements HessianService {

    /** Creates a new instance of HessianServiceImpl */
    public HessianServiceImpl() {
    }

    public String sayHello() {
        return "hello hessian!";
    }
}

OK，這兩個類寫好了任務就完成一大半了，只需要做一些簡單的配置任務就完成一大半了，啥也別說了來看配置文件吧

xml 代碼

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <servlet>
        <servlet-name>test</servlet-name>
        <servlet-class>hessian.service.HessianServiceImpl</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>test</servlet-name>
        <url-pattern>/test</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>
            index.jsp
        </welcome-file>
    </welcome-file-list>
</web-app>

服務端已經做好了，現在來看客戶端是怎麼調用的，it is very 的簡單:

java 代碼

package hessian.client;

import com.caucho.hessian.client.HessianProxyFactory;
import hessian.service.HessianService;
import java.net.MalformedURLException;

/**
 *
 * @author absolute
 */
public class HessianClient {

    private String url = "http://localhost:8084/HessianTest/test";

    public HessianService getService() throws MalformedURLException {
        HessianProxyFactory factory = new HessianProxyFactory();

        return  (HessianService) factory.create(HessianService.class, url);
    }

    public static void main(String[] args) {
        HessianClient client = new HessianClient();
        try {
            HessianService service = client.getService();
            System.out.println(service.sayHello());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}