Spring HTTP Invoker是Java到Java遠程處理的重要解決方案。 該技術使用標準的Java序列化機制通過HTTP公開服務，并且可以被視為替代解決方案，而不是Hessian和Burlap中的自定義序列化。 而且，它僅由Spring提供，因此客戶端和服務器應用程序都必須基于Spring。

Spring通過HttpInvokerProxyFactoryBean和HttpInvokerServiceExporter支持HTTP調用程序基礎結構。 HttpInvokerServiceExporter，它將指定的服務bean導出為HTTP調用程序服務端點，可通過HTTP調用程序代理訪問。 HttpInvokerProxyFactoryBean是用于HTTP調用程序代理的工廠bean。

此外，還提供了有關Spring Remoting簡介和RMI Service＆Client示例項目的Spring Remoting支持和RMI文章。

讓我們看一下Spring Remoting Support，以開發(fā)Http Invoker Service＆Client。

二手技術：

• JDK 1.6.0_31
• 春天3.1.1
• Tomcat 7.0
• Maven的3.0.2

步驟1：建立已完成的專案

創(chuàng)建一個Maven項目，如下所示。 （可以使用Maven或IDE插件來創(chuàng)建它）。

步驟2：圖書館

Spring依賴項已添加到Maven的pom.xml中。

<!-- 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>

步驟3：建立使用者類別

創(chuàng)建一個新的用戶類。

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;}@Overridepublic String toString() {StringBuilder strBuilder = new StringBuilder();strBuilder.append("Id : ").append(getId());strBuilder.append(", Name : ").append(getName());strBuilder.append(", Surname : ").append(getSurname());return strBuilder.toString();} }

步驟4：建立ICacheService介面

創(chuàng)建了代表遠程緩存服務接口的ICacheService接口。

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();}

步驟5：創(chuàng)建CacheService類

CacheService類是通過實現(xiàn)ICacheService接口創(chuàng)建的。 它提供對遠程緩存的訪問…

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;}}

步驟6：建立IHttpUserService接口

創(chuàng)建了代表Http用戶服務接口的IHttpUserService。 此外，它為Http客戶端提供了遠程方法。

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();}

步驟7：創(chuàng)建HttpUserService類

HttpUserService類是通過實現(xiàn)IHttpUserService接口創(chuàng)建的。

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;}}

步驟8：創(chuàng)建HttpUserService-servlet.xml

HttpUserService應用程序上下文如下所示。 該xml必須命名為your_servlet_name-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:util="http://www.springframework.org/schema/util"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/utilhttp://www.springframework.org/schema/util/spring-util-3.0.xsd"><!-- 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>

步驟9：創(chuàng)建web.xml

web.xml的配置如下：

<?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>

步驟10：創(chuàng)建HttpUserServiceClient類

HttpUserServiceClient類已創(chuàng)建。 它調用遠程Http用戶服務并執(zhí)行用戶操作。

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...");} }

步驟11：創(chuàng)建httpClientAppContext.xml

Http客戶端應用程序上下文如下所示：

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><!-- 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>

步驟12：部署項目

將OTV_SpringHttpInvoker Project部署到Tomcat之后，將啟動Http用戶服務客戶端，并且輸出日志如下所示：

.... 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 ...

步驟13：下載

OTV_SpringHttpInvoker

參考： Online Technology Vision博客上的JCG合作伙伴 Eren Avsarogullari 提供的Http Invoker的Spring Remoting支持 。

翻譯自: https://www.javacodegeeks.com/2012/04/spring-remoting-support-with-http.html

總結

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