Spring поддерживает инфраструктуру HTTP invoker через HttpInvokerProxyFactoryBean и HttpInvokerServiceExporter. HttpInvokerServiceExporter, который экспортирует указанный компонент службы в качестве конечной точки службы HTTP invoker, доступный через прокси HTTP invoker. HttpInvokerProxyFactoryBean — это фабричный компонент для прокси-серверов HTTP invoker.
Также предлагается поддержка Spring Remoting и статья RMI для ознакомления с Spring Remoting и примера проекта RMI Service & Client.
Давайте посмотрим на поддержку Spring Remoting для разработки Http Invoker Service & Client.
Используемые технологии:
- JDK 1.6.0_31
- Весна 3.1.1
- Tomcat 7.0
- Maven 3.0.2
ШАГ 1: СОЗДАТЬ MAVEN ПРОЕКТ
Maven проект создается как показано ниже. (Его можно создать с помощью Maven или IDE Plug-in).
ШАГ 2: БИБЛИОТЕКИ
Spring-зависимости добавляются в pom.xml Maven.
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<!-- Spring 3.1.x dependencies --> < properties > < spring.version >3.1.1.RELEASE</ spring.version > </ properties > < dependencies > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-core</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-context</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-remoting</ artifactId > < version >2.0.8</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-web</ artifactId > < version >${spring.version}</ version > </ dependency > < dependency > < groupId >org.springframework</ groupId > < artifactId >spring-webmvc</ artifactId > < version >${spring.version}</ version > </ dependency > < dependencies > |
ШАГ 3: СОЗДАЙТЕ ПОЛЬЗОВАТЕЛЬСКИЙ КЛАСС
Новый класс пользователя создан.
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package com.otv.user; import java.io.Serializable; /** * User Bean * * @author onlinetechvision.com * @since 24 Feb 2012 * @version 1.0.0 * */ public class User implements Serializable { private long id; private String name; private String surname; /** * Get User Id * * @return long id */ public long getId() { return id; } /** * Set User Id * * @param long id */ public void setId( long id) { this .id = id; } /** * Get User Name * * @return long id */ public String getName() { return name; } /** * Set User Name * * @param String name */ public void setName(String name) { this .name = name; } /** * Get User Surname * * @return long id */ public String getSurname() { return surname; } /** * Set User Surname * * @param String surname */ public void setSurname(String surname) { this .surname = surname; } @Override public String toString() { StringBuilder strBuilder = new StringBuilder(); strBuilder.append( "Id : " ).append(getId()); strBuilder.append( ", Name : " ).append(getName()); strBuilder.append( ", Surname : " ).append(getSurname()); return strBuilder.toString(); } } |
ШАГ 4: СОЗДАЙТЕ ИНТЕРФЕЙС ICacheService
Интерфейс ICacheService, представляющий интерфейс службы удаленного кэша, создан.
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package com.otv.cache.service; import java.util.concurrent.ConcurrentHashMap; import com.otv.user.User; /** * Cache Service Interface * * @author onlinetechvision.com * @since 10 Mar 2012 * @version 1.0.0 * */ public interface ICacheService { /** * Get User Map * * @return ConcurrentHashMap User Map */ public ConcurrentHashMap<Long, User> getUserMap(); } |
ШАГ 5: СОЗДАЙТЕ CacheService CLASS
Класс CacheService создается путем реализации интерфейса ICacheService. Предоставляет доступ к удаленному кешу…
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package com.otv.cache.service; import java.util.concurrent.ConcurrentHashMap; import com.otv.user.User; /** * Cache Service Implementation * * @author onlinetechvision.com * @since 10 Mar 2012 * @version 1.0.0 * */ public class CacheService implements ICacheService { //User Map is injected... ConcurrentHashMap<Long, User> userMap; /** * Get User Map * * @return ConcurrentHashMap User Map */ public ConcurrentHashMap<Long, User> getUserMap() { return userMap; } /** * Set User Map * * @param ConcurrentHashMap User Map */ public void setUserMap(ConcurrentHashMap<Long, User> userMap) { this .userMap = userMap; } } |
ШАГ 6: СОЗДАЙТЕ ИНТЕРФЕЙС IHttpUserService
IHttpUserService, представляющий интерфейс службы пользователя Http, создан. Кроме того, он предоставляет удаленные методы для клиентов Http…
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package com.otv.http.server; import java.util.List; import com.otv.user.User; /** * Http User Service Interface * * @author onlinetechvision.com * @since 10 Mar 2012 * @version 1.0.0 * */ public interface IHttpUserService { /** * Add User * * @param User user * @return boolean response of the method */ public boolean addUser(User user); /** * Delete User * * @param User user * @return boolean response of the method */ public boolean deleteUser(User user); /** * Get User List * * @return List user list */ public List<User> getUserList(); } |
ШАГ 7: СОЗДАЙТЕ HttpUserService CLASS
Класс HttpUserService создается путем реализации интерфейса IHttpUserService.
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package com.otv.http.server; import java.util.ArrayList; import java.util.List; import org.apache.log4j.Logger; import com.otv.cache.service.ICacheService; import com.otv.user.User; /** * Http User Service Implementation * * @author onlinetechvision.com * @since 10 Mar 2012 * @version 1.0.0 * */ public class HttpUserService implements IHttpUserService { private static Logger logger = Logger.getLogger(HttpUserService. class ); //Remote Cache Service is injected... ICacheService cacheService; /** * Add User * * @param User user * @return boolean response of the method */ public boolean addUser(User user) { getCacheService().getUserMap().put(user.getId(), user); logger.debug( "User has been added to cache. User : " +getCacheService().getUserMap().get(user.getId())); return true ; } /** * Delete User * * @param User user * @return boolean response of the method */ public boolean deleteUser(User user) { getCacheService().getUserMap().remove(user.getId()); logger.debug( "User has been deleted from cache. User : " +user); return true ; } /** * Get User List * * @return List user list */ public List<User> getUserList() { List<User> list = new ArrayList<User>(); list.addAll(getCacheService().getUserMap().values()); logger.debug( "User List : " +list); return list; } /** * Get Remote Cache Service * * @return ICacheService Remote Cache Service */ public ICacheService getCacheService() { return cacheService; } /** * Set Remote Cache Service * * @param ICacheService Remote Cache Service */ public void setCacheService(ICacheService cacheService) { this .cacheService = cacheService; } } |
ШАГ 8: СОЗДАЙТЕ HttpUserService-servlet.xml
Контекст приложения HttpUserService отображается следующим образом. Этот xml должен называться your_servlet_name-servlet.xml
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xsi:schemaLocation="http://www.springframework.org/schema/beans <!-- User Map Declaration --> < bean id = "UserMap" class = "java.util.concurrent.ConcurrentHashMap" /> <!-- Cache Service Declaration --> < bean id = "CacheService" class = "com.otv.cache.service.CacheService" > < property name = "userMap" ref = "UserMap" /> </ bean > <!-- Http User Service Bean Declaration --> < bean id = "HttpUserService" class = "com.otv.http.server.HttpUserService" > < property name = "cacheService" ref = "CacheService" /> </ bean > <!-- Http Invoker Service Declaration --> < bean id = "HttpUserServiceExporter" class = "org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter" > <!-- service represents Service Impl --> < property name = "service" ref = "HttpUserService" /> <!-- serviceInterface represents Http Service Interface which is exposed --> < property name = "serviceInterface" value = "com.otv.http.server.IHttpUserService" /> </ bean > <!-- Mapping configurations from URLs to request handler beans --> < bean id = "urlMapping" class = "org.springframework.web.servlet.handler.SimpleUrlHandlerMapping" > < property name = "mappings" > < props > < prop key = "/HttpUserService" >HttpUserServiceExporter</ prop > </ props > </ property > </ bean > </ beans > |
ШАГ 9: СОЗДАТЬ web.xml
web.xml настроен следующим образом:
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<? 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_2_5.xsd" id = "WebApp_ID" version = "2.5" > < display-name >OTV_SpringHttpInvoker</ display-name > <!-- Spring Context Configuration' s Path definition --> < context-param > < param-name >contextConfigLocation</ param-name > < param-value > /WEB-INF/HttpUserService-servlet.xml </ param-value > </ context-param > <!-- The Bootstrap listener to start up and shut down Spring's root WebApplicationContext. It is registered to Servlet Container --> < listener > < listener-class >org.springframework.web.context.ContextLoaderListener</ listener-class > </ listener > <!-- Central dispatcher for HTTP-based remote service exporters. Dispatches to registered handlers for processing web requests.--> < servlet > < servlet-name >HttpUserService</ servlet-name > < servlet-class >org.springframework.web.servlet.DispatcherServlet</ servlet-class > < load-on-startup >2</ load-on-startup > </ servlet > <!-- Servlets should be registered with servlet container and mapped with url for the http requests. --> < servlet-mapping > < servlet-name >HttpUserService</ servlet-name > < url-pattern >/HttpUserService</ url-pattern > </ servlet-mapping > < welcome-file-list > < welcome-file >/pages/index.xhtml</ welcome-file > </ welcome-file-list > </ web-app > |
ШАГ 10: СОЗДАЙТЕ КЛАСС HttpUserServiceClient
Класс HttpUserServiceClient создан. Вызывает Remote Http User Service и выполняет пользовательские операции.
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package com.otv.http.client; import org.apache.log4j.Logger; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.otv.http.server.IHttpUserService; import com.otv.user.User; /** * Http User Service Client * * @author onlinetechvision.com * @since 24 Feb 2012 * @version 1.0.0 * */ public class HttpUserServiceClient { private static Logger logger = Logger.getLogger(HttpUserServiceClient. class ); /** * Main method of the Http User Service Client * */ public static void main(String[] args) { logger.debug( "Http User Service Client is starting..." ); //Http Client Application Context is started... ApplicationContext context = new ClassPathXmlApplicationContext( "httpClientAppContext.xml" ); //Remote User Service is called via Http Client Application Context... IHttpUserService httpClient = (IHttpUserService) context.getBean( "HttpUserService" ); //New User is created... User user = new User(); user.setId( 1 ); user.setName( "Bruce" ); user.setSurname( "Willis" ); //The user is added to the remote cache... httpClient.addUser(user); //The users are gotten via remote cache... httpClient.getUserList(); //The user is deleted from remote cache... httpClient.deleteUser(user); logger.debug( "Http User Service Client is stopped..." ); } } |
ШАГ 11: СОЗДАЙТЕ httpClientAppContext.xml
Контекст приложения клиента Http выглядит следующим образом:
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xsi:schemaLocation="http://www.springframework.org/schema/beans <!-- Http Invoker Client Declaration --> < bean id = "HttpUserService" class = "org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean" > <!-- serviceUrl demonstrates Http Service Url which is called--> < property name = "serviceUrl" value = "http://remotehost:port/OTV_SpringHttpInvoker-0.0.1-SNAPSHOT/HttpUserService" /> <!-- serviceInterface demonstrates Http Service Interface which is called --> < property name = "serviceInterface" value = "com.otv.http.server.IHttpUserService" /> </ bean > </ beans > |
ШАГ 12: ДЕПЛОЙНЫЙ ПРОЕКТ
После развертывания проекта OTV_SpringHttpInvoker на Tomcat запускается клиент службы поддержки пользователей Http, и выходные журналы отображаются следующим образом:
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.... 15.03.2012 21:26:41 DEBUG (DispatcherServlet.java:819) - DispatcherServlet with name 'HttpUserService' processing POST request for [ /OTV_SpringHttpInvoker-0 .0.1-SNAPSHOT /HttpUserService ] 15.03.2012 21:26:41 DEBUG (AbstractUrlHandlerMapping.java:124) - Mapping [ /HttpUserService ] to HandlerExecutionChain with handler [org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter@f9104a] and 1 interceptor 15.03.2012 21:26:41 DEBUG (RemoteInvocationTraceInterceptor.java:73) - Incoming HttpInvokerServiceExporter remote call: com.otv.http.server.IHttpUserService.addUser 15.03.2012 21:26:41 DEBUG (HttpUserService.java:33) - User has been added to cache. User : Id : 1, Name : Bruce, Surname : Willis 15.03.2012 21:26:41 DEBUG (RemoteInvocationTraceInterceptor.java:79) - Finished processing of HttpInvokerServiceExporter remote call: com.otv.http.server.IHttpUserService.addUser 15.03.2012 21:26:41 DEBUG (DispatcherServlet.java:957) - Null ModelAndView returned to DispatcherServlet with name 'HttpUserService' : assuming HandlerAdapter completed request handling 15.03.2012 21:26:41 DEBUG (FrameworkServlet.java:913) - Successfully completed request 15.03.2012 21:26:41 DEBUG (DispatcherServlet.java:819) - DispatcherServlet with name 'HttpUserService' processing POST request for [ /OTV_SpringHttpInvoker-0 .0.1-SNAPSHOT /HttpUserService ] 15.03.2012 21:26:41 DEBUG (AbstractUrlHandlerMapping.java:124) - Mapping [ /HttpUserService ] to HandlerExecutionChain with handler [org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter@f9104a] and 1 interceptor 15.03.2012 21:26:41 DEBUG (RemoteInvocationTraceInterceptor.java:73) - Incoming HttpInvokerServiceExporter remote call: com.otv.http.server.IHttpUserService.getUserList 15.03.2012 21:26:41 DEBUG (HttpUserService.java:57) - User List : [Id : 1, Name : Bruce, Surname : Willis] 15.03.2012 21:26:41 DEBUG (RemoteInvocationTraceInterceptor.java:79) - Finished processing of HttpInvokerServiceExporter remote call: com.otv.http.server.IHttpUserService.getUserList 15.03.2012 21:26:41 DEBUG (DispatcherServlet.java:957) - Null ModelAndView returned to DispatcherServlet with name 'HttpUserService' : assuming HandlerAdapter completed request handling 15.03.2012 21:26:41 DEBUG (FrameworkServlet.java:913) - Successfully completed request 15.03.2012 21:26:41 DEBUG (DispatcherServlet.java:819) - DispatcherServlet with name 'HttpUserService' processing POST request for [ /OTV_SpringHttpInvoker-0 .0.1-SNAPSHOT /HttpUserService ] 15.03.2012 21:26:41 DEBUG (AbstractUrlHandlerMapping.java:124) - Mapping [ /HttpUserService ] to HandlerExecutionChain with handler [org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter@f9104a] and 1 interceptor 15.03.2012 21:26:41 DEBUG (RemoteInvocationTraceInterceptor.java:73) - Incoming HttpInvokerServiceExporter remote call: com.otv.http.server.IHttpUserService.deleteUser 15.03.2012 21:26:41 DEBUG (HttpUserService.java:45) - User has been deleted from cache. User : Id : 1, Name : Bruce, Surname : Willis 15.03.2012 21:26:41 DEBUG (RemoteInvocationTraceInterceptor.java:79) - Finished processing of HttpInvokerServiceExporter remote call: com.otv.http.server.IHttpUserService.deleteUser 15.03.2012 21:26:41 DEBUG (DispatcherServlet.java:957) - Null ModelAndView returned to DispatcherServlet with name 'HttpUserService' : assuming HandlerAdapter completed request handling 15.03.2012 21:26:41 DEBUG (FrameworkServlet.java:913) - Successfully completed request ... |
ШАГ 13: СКАЧАТЬ
Справка: поддержка Spring Remoting с Http Invoker от нашего партнера по JCG Эрен Авсарогуллари в блоге Online Technology Vision .