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Spring整合Hessian

←手機掃碼閱讀     火星人 @ 2014-03-09 , reply:0

Spring讓Hessian變得不但強大,而且易用,但是易用背後,卻有不少陷阱!

這個例子很簡單,但實際上的確花費了我超過一小時的時間,排除了種種問題,問題終於水落石出.

整合以上篇Hello Hessian為基礎,加入Spring框架,進行改進.

一、環境

jdk1.5

http://labs.xiaonei.com/apache-mirror/tomcat/tomcat-6/v6.0.20/bin/apache-tomcat-6.0.20.zip

http://s3.amazonaws.com/dist.springframework.org/release/SPR/spring-framework-2.5.6.SEC01-with-dependencies.zip

順便說下,如果不說環境版本,很難保證你的程序在別的版本下能運行.

二、整合

1、寫Spring的發布Hessian服務的配置文件

hessian-servlet.xml

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="defaultHandlerMapping" class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<bean id="helloService" class="lavasoft.suths.service.HelloService"/>
<bean name="/hello" class="org.springframework.remoting.caucho.HessianServiceExporter">
<property name="service" ref="helloService"/>
<property name="serviceInterface" value="lavasoft.suths.service.Hello"/>
</bean>
</beans>

2、配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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"
version="2.5">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/hessian-servlet.xml
</param-value>
</context-param>
<servlet>
<servlet-name>hessian</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>4</load-on-startup>
</servlet>


<servlet-mapping>
<servlet-name>hessian</servlet-name>
<url-pattern>/hessian/*</url-pattern>
</servlet-mapping>
</web-app>

陷阱:

a)hessian-servlet.xml的文件名必須以<servlet-name>hessian</servlet-name>名字開頭,並且加上-servlet.xml一段,組成完整的文件名.

b)hessian-servlet.xml的文件名格式必須是[servlet-name]-servlet.xml格式,否則出錯.

三、部署應用

涉及到類載入順序問題,好用IDEA啟動Tomcat測試老失敗,不知道為啥!這次不用IDEA嵌入式啟動Tomcat了,直接自己部署測試.

部署后,啟動界面如下:

三、寫測試

這次測試,可以在上個例子的基礎上進行修改來測試,根據上面的配置,那麼請求HelloService的URL應該是:http://localhost:8080/hessianapp/hessian/hello

package lavasoft.suths.service.client;

import com.caucho.hessian.client.HessianProxyFactory;
import lavasoft.suths.service.Hello;

import java.net.MalformedURLException;

/**
* 客戶端調用(會依賴服務介面)
*
* @author leizhimin 2009-8-14 12:29:33
*/

public class Client {
public static void main(String[] args) throws MalformedURLException {
String url =
"http://localhost:8080/hessianapp/hessian/hello";
HessianProxyFactory factory = new HessianProxyFactory();
Hello hello = (Hello) factory.create(Hello.class, url);
System.out.println(hello.sayHello("Hessian"));
}
}

運行結果:

Hello Hessian!

Process finished with exit code 0

還有一種測試方法,就是在客戶端也使用Spring,需要做個配置remoting-client.xml:

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="helloServiceClient" class="org.springframework.remoting.caucho.HessianProxyFactoryBean">
<property name="serviceUrl" value="http://localhost:8080/hessianapp/hessian/hello"/>
<property name="serviceInterface" value="lavasoft.suths.service.Hello"/>
</bean>
</beans>

然後寫個測試類:

package lavasoft.suths.service.client;

import lavasoft.suths.service.Hello;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
* Spring整合Hessian,客戶端測試
*
* @author leizhimin 2009-8-14 15:32:46
*/

public class TestClient {
public static void main(String[] args) {
try {
ApplicationContext context = new ClassPathXmlApplicationContext("/remoting-client.xml");
Hello hello = (Hello) context.getBean("helloServiceClient");
System.out.println(hello.sayHello("Spring Hession"));
}
catch (Exception e) {
e.printStackTrace();
}
}
}

運行結果:

Hello Spring Hession!

Process finished with exit code 0

陷阱:實際上,看著代碼好好,程序有時候還是不能跑,原因是Hessian的版本問題,這裡推薦使用Spring自帶的版本,就不會有問題了.

整個工程依賴的包:

log4j-1.2.15.jar
spring-aop.jar
spring-beans.jar
spring-context.jar
spring-context-support.jar
spring-core.jar
spring-jdbc.jar
spring-jms.jar
spring-orm.jar
spring-test.jar
spring-tx.jar
spring-web.jar
spring-webmvc.jar
spring-webmvc-portlet.jar
spring-webmvc-struts.jar
hessian-3.1.3.jar
aopalliance.jar
commons-logging.jar


[火星人 ] Spring整合Hessian已經有792次圍觀

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