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原文地址：http://www.studytrails.com/frameworks/spring/spring-remoting-http-invoker.jsp
In the earlier articles we saw an introduction to spring remoting and its support for RMI, Hessian and Burlap. In this tutorial we look at one more support for remoting - HttpInvoker. HttpInvoker combines the ease of Hessian and Burlap, in that it is very easy to set up. It serializes and deserializes java object for trasport over the network. However, probably the only drawback is that Http Invoker is bound to java and hence the clients all need to be java based. This is the recommended choice for remoting for java-java based communication. The main classes are :org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter - This is a servlet API based Http request handler. It is used to export the remote services. It takes in a service property that is the service to be exported and aServiceInterface that specifies the interface that the service is tied to.
org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean - This is a proxy factory for creating http invoker proxies. It has a serviceUrl property that must be an http url exposing an http invoker service. This class serializes the objects that are sent to remote services and deserializes the objects back.
Create the GreetingService interface as shown below.
Create a method named getGreeting() that takes a name as a parameter and returns the greeting message (see line 5 below).
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package com.studytrails.tutorials.springremotinghttpinvokerserver;public interface GreetingService {String getGreeting(String name);} |
Create a class GreetingServiceImpl as shown below.
It implements the GreetingService interface (described earlier)
Implement the getGreeting() method by sending a greeting message (see lines 6-8 below).
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package com.studytrails.tutorials.springremotinghttpinvokerserver;public class GreetingServiceImpl implements GreetingService{@Overridepublic String getGreeting(String name) {return "Hello " + name + "!";}} |
Create the httpinvoker-servlet.xml file (see below).
Declare the ‘greetingService‘ (see lines 14-15 below).
Export the ‘greetingService‘ using Spring‘s HttpInvokerServiceExporter class (see lines 17-21 below).
Note the following properties of HttpInvokerServiceExporter class:
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<?xml version="1.0" encoding="UTF-8" ?>xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/mvc<bean id="greetingService"class="com.studytrails.tutorials.springremotinghttpinvokerserver.GreetingServiceImpl" /><bean name="/greetingService.http"class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter"><property name="service" ref="greetingService" /><property name="serviceInterface" value="com.studytrails.tutorials.springremotinghttpinvokerserver.GreetingService"/></bean></beans> |
Create the web.xml file (see below).
Create the servlet mapping for the url pattern ‘*.http‘ (see line 16 below) for Spring‘s DispatcherServlet (see line 10 below)
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<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"<web-app><display-name>Spring Remoting: Http Invoker Server</display-name><servlet><servlet-name>httpinvoker</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>httpinvoker</servlet-name><url-pattern>*.http</url-pattern></servlet-mapping></web-app> |
Create the GreetingService interface as shown below.
Copy the GreetingService interface created for Http Invoker Server (described above) and paste it in Http Invoker Client source code while retaining the java package structure.
Note: For reference, the source code is shown below.
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package com.studytrails.tutorials.springremotinghttpinvokerserver;public interface GreetingService {String getGreeting(String name);} |
Create a class TestSpringRemotingHttpInvoker shown below to test Spring Http Invoker Remoting.
Load spring configuration file (see line 11 below)
Get a reference to GreetingService using the bean name ‘greetingService‘ (see line 12 below)
Call the GreetingService.getGreting() method by passing the name ‘Alpha‘ (see line 13 below)
Print the greeting message (see line 14 below).
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package com.studytrails.tutorials.springremotinghttpinvokerclient;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.studytrails.tutorials.springremotinghttpinvokerserver.GreetingService;public class TestSpringRemotingHttpInvoker {public static void main(String[] args) {ApplicationContext context = new ClassPathXmlApplicationContext("spring-config-client.xml");GreetingService greetingService = (GreetingService)context.getBean("greetingService");String greetingMessage = greetingService.getGreeting("Alpha");System.out.println("The greeting message is : " + greetingMessage);}} |
Create the spring-config-client.xml file (see below).
Declare the ‘greetingService‘ using Spring‘s HttpInvokerProxyFactoryBean class (see lines 13-16 below).
Note the following properties of HttpInvokerProxyFactoryBean class:
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<?xml version="1.0" encoding="UTF-8"?>xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="<bean id="greetingService" class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean"><property name="serviceUrl" value="http://localhost:8080/springremotinghttpinvokerserver/greetingService.http"/><property name="serviceInterface" value="com.studytrails.tutorials.springremotinghttpinvokerserver.GreetingService"/></bean></beans> |
This sample program has been packaged as a jar installer which will copy the source code (along with all necessary dependencies)on your machine and automatically run the program for you as shown in the steps below. To run the sampleprogram, you only need Java Runtime Environment (JRE) on your machine and nothing else.
(Alternatively you can go the folder containing the springremotinghttpinvokerserver-installer.jar and execute the jar using java -jar springremotinghttpinvokerserver-installer.jarcommand)
This sample program has been packaged as a jar installer which will copy the source code (along with all necessary dependencies)on your machine and automatically run the program for you as shown in the steps below. To run the sampleprogram, you only need Java Runtime Environment (JRE) on your machine and nothing else.
(Alternatively you can go the folder containing the springremotinghttpinvokerclient-installer.jar and execute the jar using java -jar springremotinghclient-installer.jar command)
This source code for this program is downloaded in the folder specified by you (say, C:\Temp) as an eclipse project called springremotinghttpinvokerserver . All the required libraries have also been downloaded and placed in the same location. You can open this project from Eclipe IDE and directly browse the source code. See below for details of the project structure.
The WAR file for this example is available as springremotinghttpinvokerserver.war in the download folder specified by you earlier (e.g. C:\Temp). The path for the WAR file is <DOWNLOAD_FOLDER_PATH>/springremotinghttpinvokerserver/dist/springremotinghttpinvokerserver.war.
This WAR file can be deployed in any webserver of your choice and example can be executed. 
This source code for this program is downloaded in the folder specified by you (say, C:\Temp) as an eclipse project called springremotinghttpinvokerclient . All the required libraries have also been downloaded and placed in the same location. You can open this project from Eclipe IDE and directly browse the source code. See below for details of the project structure.
Spring Remoting: HTTP Invoker--转
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原文地址：http://www.cnblogs.com/davidwang456/p/5480845.html
