Spring 2.0 技術手冊第七章 - Spring Web MVC 框架

1. 。別類的當適用使求需的己自依以可您讓，構架承繼Controller Controller的善完個一了供提還，外之架框供提了除 Spring Web MVC 。便方為更上合整的能功多許在，能功器容的 IoC 合結，題問架框 Spring 的存現決解能望希，案 Web MVC方架框的己自供提也 Web MVC ，） S pring（架框F ramework MVC 的案專）Web （碼始原放開多許有今現，構架的薦推所 O penSource員人發開數多受，時式程用應發開來以久長是構架 Web Web MVC Spring Web MVC 框架 7

2. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） 7.1 Spring Web MVC 入門的單簡最個一從將，中節小個這在解了來，式程用應 Spring Web Web MVC 的及以，式方作運的構架 Spring Web 。構架現實何如架框Web MVC 7.1.1 使用 Eclipse Web Tools Platform 用使將，式程用應的章本 Web Eclipse Web Tools Platform （ W TP ）「的在以可您，發開行進來 http://www.eclipse.org/webtools/ d ownloads 」用使將章本。本版的」「載下區 W ebTools Platform; All-in-one Tomcat 5.5 至請也以所，） Servlet （器容為作 C ontainer http://tomcat.apache.org/ Tomcat 5.5 。載下用使算打果如 Eclipse 裝安式方新更上線的 WTP 下考參以可則，：學教音影的址網列 http://eclipse.cdpa.nsysu.edu.tw/technology/phoenix/demos/i nstall-wtp/install-wtp.html 寫撰了為，後之行執在 WTP Web 的便方些一用使以可，時式程用應「行執請，合組窗視具工啟開擇選，」 W indow/Open Perspective/Other… ：」 J 2EE Perspective 「7 2

3. Chapter 7 Spring Web MVC 架框圖 7.1 啟開擇選 J2EE Perspective 動啟接直中在以可就此如，境環行執 Server 定設要先首 WTP Tomcat選方下窗視在請，式程用應的寫撰所中在試測以，器容 WTP Web WTP ：」「行執，鍵右鼠滑按中窗視於並，」 S ervers 「擇 N ew/Server 圖 7.2 增新 Server 境環行執用使將章本為因 Tomcat 5.5 「在著接以所， N ew Server 擇選中窗視」「的中」 A pache「 T omcat v5.5 Server ：」 7 3

4. 7 4 ： FirstSpringMVC為稱名案專 Spring Web MVC 個一第設假，稱名案專入輸，後之鈕按 N ext」「下按在，案專」 W eb/Dynamic Web Project 「擇選，時案專增新」 F ile/New/Project… 「行執在以可，式程用應寫撰要中在 Web WTP 境環行執 Server 了增新 7.4 圖：示所圖下如後成完，增新的境環行執成完可即，鈕按 Server」 F inish 「下按著接，夾料資裝安 Tomcat 擇選請，後之鈕按」「下按 N ext 型類 Server 定設 7.3 圖） – http://openhome.cc 良信林（冊手術技 Spring 2.0

5. Chapter 7 Spring Web MVC 架框圖 7.5 態動增新 Web 案專理管源資了為次這。增新的案專成完可即，後之鈕按」「下按 F inish，的依相其及以，用使接直，便方的上 spring.jar commons-logging.jar jar 。下夾料資到放個兩這將請 WEB-INF/lib 圖 7.6 態動 Web 構結案專 7

6. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）式程用應在置放須必是或，案檔碼始原 WTP 的中 Java 在 Web 資關相或頁網它其，下之錄目在增新以可，案檔的下 Classpath src Web 為）（出匯要後以，下之錄目在增新以可，源 WebContent E xport WAR 為織組案檔關相將動自會，時案檔） W eb Application Archive （ W TP Web 。構結統系案檔的式程用應 7.1.2 第一個 Spring Web MVC 程式先須必而，源資的需所至接連接直不並者用使，中構架 Web MVC 在求請的者用使斷判器制控端前由，） F ront controller （器制控端前至接連達此藉，求請理處來） D ispatch （件物制控個一哪給）（派分要 C ontroller 。的目之源資求請者用使制控到是的色角器制控端前任擔，中架框 Spring Web MVC 的在 org.spring- 將責負 framework.web.servlet.DispatcherServlet ， D ispatcherServlet 是就，步一第的用使以所，件物制控給配分求請的戶客 Spring Web MVC web.xml ： DispatcherServlet 義定中在 FirstSpringMVC web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app 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" version="2.4"> <session-config> <session-timeout> 30 </session-timeout> </session-config>7 6

7. Chapter 7 Spring Web MVC 架框 <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/mvc-config.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping></web-app> 例實的 web.xml 個一了義定中在 DispatcherServlet "dispatcher-由會都求請的尾結Servlet" 至接連有所，到看以可中定設從， *.do定設來用數參始初"dispatcherServlet" ，理處來 " contextConfigLocation"參始初Bean 置設不果如，稱名與置位的檔義定 "contextConfigLocation" 「取讀，置前為稱名的用使會設預 DispatcherServlet 則，數 Servlet S ervlet取讀會則中定設的面上在，檔義定 - servlet.xml 其為作」 Bean 稱名mvc-config.xml 。義定的中：是像，源來的檔義定個多義定以可也您 Bean...<servlet> <servlet-name>hello</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/mvc-config.xml, 7 7

8. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） → /WEB-INF/other-service.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> ... （件物制控至求請配分責負 DispatcherServlet C ontroller 在，） Spring Web MVC 作實要件物制控，中架框 org.springframework.web.servlet. 的作實須必個一有面介 mvc.Controller ，面介 C ontroller handleRequest() ：示所下如義定其，法方 package org.springframework.web.servlet.mvc; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; public interface Controller { ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception; } 行執會，求請的配分 Controller 到收 DispatcherServlet 當 handle- Request() 個一傳回後畢完理處，求請理處來法方 org.springframework. 在現呈要了括包，例實的 web.servlet.ModelAndView M odelAndView 。息訊關相的層它其及以，料資 View JSP 的）頁網如例（層 Model View 個一由將求請的者用使，中 S pring Web MVC 個一第在 H elloController ：示所下如作實其，理處來件物 FirstSpringMVC HelloController.java package onlyfun.caterpillar; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.mvc.Controller;7 8

9. Chapter 7 Spring Web MVC 架框import org.springframework.web.servlet.ModelAndView;public class HelloController implements Controller { private String viewPage; public ModelAndView handleRequest(HttpServletRequest req, HttpServletResponse res) throws Exception { String user = req.getParameter("user"); return new ModelAndView(viewPage, "user", user); } public void setViewPage(String viewPage) { this.viewPage = viewPage; }}在定設並，數參求請的者用使自來了得取，中 Controller 個這在 " user"個一第的ModelAndView 構建，中子例個這在，中例實的 ModelAndView得取來用定設是數引個二第，徑路）源資或（頁網標目的現呈要為數引的料資現呈層給是數引個三第而，）（鍵的件物Model " K ey " View Model 。件物進，求請的者用使集收為用作的件物制控，下構架 Web MVC 在也，輯邏務商行執中件物制控在應不，作動的關相層與行 Web 件物的層務商讓會這，層務商至入侵的關相 Servlet API 讓應不件物 Servlet API 讓能不如例，合耦生產與 HttpServletRequest 。中之件物層務商至定設接直器容其在的 Spring Web MVC ，是處好的 S pring 用使 Controller IoC相成完來入注賴依其用利並，理管以加來 Bean 的般一同如以可，下理管定設中案檔在以可您，說來子例的邊這以，入注的件物關 XML Controller的檔義定下一看來，徑路頁網的料資現呈要所，後之畢完理處求請 Bean 7

10. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）依，容內 web.xml 在請，定設的中 WEB-INF 立建下錄目 mvc-config.xml ：案檔 FirstSpringMVC mvc-config.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean name="/hello.do" class="onlyfun.caterpillar.HelloController"> <property name="viewPage" value="hello"/> </bean> </beans> 上際實個一據根須必 DispatcherServlet HandlerMapping 定決，件物個一哪由求請 Controller ，理處來D ispatcherServlet 用使設預 org.spring- 是就也， framework.web.servlet.handler.BeanNameUrlHandlerMapping 一哪用使定決，的求請者用使及性屬 Bean "name" 的時義定在據根 URL ，時 Controller 求請，中子例個這在如例，例實個 /FirstSpringMVC/hello.do 為用使要定決，稱名 DispatcherServlet 據根 "hello.do" "name" "hello.do" 。理處來例實的 Bean 由交求請將是就以所，例實的 HelloController 由交會，後 Controller 回傳當 ModelAndView D ispatcherServlet 個一置設要需您而因，析解關相的層 ViewResolver 作來件物 View 用使以所，術技層為作以將中例範個這在，例實 ViewResolver JSP View7 1

11. Chapter 7 Spring Web MVC 架框org.springframework.web.servlet.view.InternalResourceViewResolver ，InternalResourceViewResolver 置設要需 "viewClass" 是設預， org.spring-framework.web.servlet.view.InternalResourceView 援支別類個這，Servlet 。）、是像（源資關相的術技 JSP S ervlet 與會性屬、的 InternalResourceViewResolver "prefix" " suffix" Model-則，串字AndView 為回傳訊資徑路若如例，合結訊資徑路的回傳 "hello" 。是就徑路的際實，合結定設子例的上以與 /WEB-INF/jsp/hello.jsp ：的試測個一寫中 /WEB-INF/jsp/ 在以可後最 hello.jsp FirstSpringMVC hello.jsp<%@ page language="java" contentType="text/html; charset=BIG5" pageEncoding="BIG5"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=BIG5"><title>First Spring MVC</title></head><body> <h1>Hello, ${user}!!</h1></body></html> 由經，件物的置設中 ModelAndView 在 Model InternalResourceView-的取存可中術技為定設將，析解的Resolver 及 InternalResourceView JSP取來的中術技用使以可此因，） A ttribute （性屬JSP Expression Language參了帶附時求請在您果如，式程的寫撰所上以依，料資得 hello.do " user" 「的行執以可，息訊現出會的後最則，數 JSP " user" WTP R un/Run As/Run網將請，器覽瀏動啟並On Server 動啟動自會，令指」 W TP Tomcat Web個一，向指址 http://localhost:8080/FirstSpringMVC/hello.do?user=Justin ：示所下如面畫考參的行執 7 11

12. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）圖 7.7 FirstSpringMVC 面畫考參行執 7.1.3 WebApplicationContext 的義定所己自在要想果如 Servlet 用使中別類 Spring 則，能功器容的用使以可也例， org.springframework.web.context.ContextLoaderListener ：義定以加籤標 web.xml用使中在如 <listener> ... <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> ... 取讀會設預 ContextLoaderListener applicationContext.xml 以可您，在要只，檔義定的己自定指 <context-param> 定指中 "contextConfig- ：如例，數參 Location" ... <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/beans-config.xml, → /WEB-INF/demo-service.xml</param-value> </context-param> ...7 12

13. Chapter 7 Spring Web MVC 架框的義定自在以可著接 Servlet 用使中 org.springframework.web.context.support.WebApplicationContextUtils 從，得取中 ServletContextorg.springframework.web.context.WebApplicationContext ：如例，WebApplicationContext ctx = WebApplicationContextUtils. getRequiredWebApplicationContext( this.getServletContext()); WebApplicationContext 了作實 ApplicationContext 是，面介 Spring為專 Servlet 的 Web 的計設式程用應ApplicationContext 取在，別類作實得WebApplicationContext 得取來它用利以可，後之 Bean 的義定中檔義定Bean ：如例，例實Date date = (Date) ctx.getBean("dateBean");援支不在 Listener 如例（上器容的定設 Servlet 2.2 ，）本版的早更以用使以可來 org.springframework.web.context.ContextLoaderServlet 的面上代取 ContextLoaderListener ：如例，定設的...<servlet> <servlet-name>contextLoader</servlet-name> <servlet-class> org.springframework.web.context.ContextLoaderServlet </servlet-class> <load-on-startup>1</load-on-startup></servlet>...設假，式方態組的整完範示來例範的單簡個一寫撰，述敘的上以合綜：示所下如，能功時報供提為用作，式程 Servlet 個一了寫撰您 7 13

14. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） WebApplicationContextDemo TimeServlet.java package onlyfun.caterpillar; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import org.springframework.web.context.WebApplicationContext; import org.springframework.web.context. support.WebApplicationContextUtils; public class TimeServlet extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { WebApplicationContext ctx = WebApplicationContextUtils. getRequiredWebApplicationContext( this.getServletContext()); PrintWriter out = res.getWriter(); out.println(ctx.getBean("dateBean")); } } 了用使中個這Servlet WebApplicationContext 得取試嘗來義定中在以可， "dateBean" web.xml ContextLoaderListener義定與 Bean ：如例，置位的檔 WebApplicationContextDemo web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app 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" version="2.4"> <session-config> <session-timeout> 30 </session-timeout>7 14

15. Chapter 7 Spring Web MVC 架框 </session-config> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/beans-config.xml</param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener> <servlet> <servlet-name>time</servlet-name> <servlet-class> onlyfun.caterpillar.TimeServlet </servlet-class> </servlet> <servlet-mapping> <servlet-name>time</servlet-name> <url-pattern>/time.do</url-pattern> </servlet-mapping></web-app>了定設，中性屬 <context-param> 的在 "contextConfigLocation" Bean ：示所下如容內的檔義定，稱名與置位的檔義定 B ean WebApplicationContextDemo beans-config.xml<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="dateBean" class="java.util.Date" scope="singleton"/></beans> 7 1

16. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）至接連器覽瀏用使以可 TimeServlet 執個一，間時的接連示顯會頁網，：示所下如面畫的行圖 7.8 WebApplicationContextDemo 面畫考參行執的 7.1.4 Handler Mapping ，時到來求請的戶客當決件物 D ispatcherServlet 據根 Handler mapping 的應對至配分求請將何如，定 Controller 常通，說來式程用應於對， Web 至應對徑路以是就 URL Controller 。的設預 DispatcherServlet Handler mapping 是 org.springframework. web.servlet.handler.BeanNameUrlHandlerMapping 在使即以所， Bean 告宣確明有沒中檔義定 BeanNameUrlHandlerMapping 用使會也， BeanNameUrlHandlerMapping 依 Bean 的義定 "name" 決來，之性屬 URL 個一哪用使定 Controller ：如例， ... <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value=”/WEB-INF/jsp/”/> <property name="suffix" value=”.jsp”/> </bean> <bean name="/hello.do" class="onlyfun.caterpillar.HelloController"> <property name="viewPage" value=”hello”/> </bean> ...7 16

17. Chapter 7 Spring Web MVC 架框對者用使，中定設的面上在 /hello.do ，求請的徑路 D ispatchServlet 都。理處件物由交會 HelloController BeanNameUrlHandlerMapping 的單簡是於用適僅， Handler mapping得使它為因，式程用應的型小 URL Controller 與關立建接直稱名別類的的 Spring 在，係 Handler mapping 是的用使常最中org.springframework. 下如子例的用使個一，web.servlet.handler.SimpleUrlHandlerMapping：示所... <bean id="urlHandlerMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/hello.do">helloController</prop> <prop key="/welcome.do">welcomeController</prop> </props> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value=”/WEB-INF/jsp/”/> <property name="suffix" value=”.jsp”/> </bean> <bean id="helloController" class="onlyfun.caterpillar.HelloController"> <property name="viewPage" value=”hello”/> </bean> <bean id="welcomeController" class="onlyfun.caterpillar.WelcomeController"> ... </bean>... 7 17

18. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）的求請是的，中置設的性屬 "mappings" 在 < prop> "key" URL 而，的，稱名的求請理處上際實定設間 <prop> </prop> 與 Bean < prop> "key" ：如例，用使以可還置設 Wildcard ... <bean id="urlHandlerMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/hello*.do">helloController</prop> <prop key="/welcome.do">welcomeController</prop> </props> </property> </bean> .... 以，中置設的面上在 hello 的尾結及頭開 .do URL 給交會都，求請 Bean 的中檔義定 " helloController" 。理處來義定若 Controller 用使可則，範規名命守遵時稱名 Spring 2.0 的增新 org.springframework.web.servlet.mvc.support.ControllerClassName HandlerMapping 寫改以可如例， FirstSpringMVC 的 mvc-config.xml ：下如 ... <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id=”controllerClassNameHandlerMapping” class="org.springframework.web.servlet.mvc. → support.ControllerClassNameHandlerMapping"/> <bean name="helloController" class="onlyfun.caterpillar.HelloController">7 18

19. Chapter 7 Spring Web MVC 架框 <property name="viewPage" value="hello"/> </bean>... 與求請的將動自會 ControllerClassNameHandlerMapping hello*Controller 尋找試嘗會將求請的如例，對比稱名別類 hello.do Hello-Controller 則，求請的是若，的樣同，理處來例實 welcome* Controller- 。理處來例實ClassNameHandlerMapping 尋找試嘗會 WelcomeController7.1.5 Handler Interceptor 在是者或，後前的行執 Controller 在果如 View 記些一作算打後之製繪作實以可，作動等求請截攔或錄org.springframework.web.servlet.Hand-下如義定其，法方個三了範規中面介個這在，面介lerInterceptor ：示所package org.springframework.web.servlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public interface HandlerInterceptor { boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception; void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception; void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception;} 7 1

20. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）的回傳，行執被前之求請理處 preHandler() Controller在會 boolean 回傳果如，求請理處來是或 Handler Interceptor 讓否是定決值 Controller false ，求請理處不就或 Interceptor 的來下接則， Controller p ostHandler() 在會法方 Controller，行執被後之求請完理處在會則 a fterCompletion() View 。行執被後之成完製繪承繼以可您 o rg.springframework.web.servlet.handler.HandlerInter- 方的要必對針要只您，面介 ceptorAdapter 了作實它， HandlerInterceptor 作實中當在，案專改修以可如例，義定新重法 FirstSpringMVC Logging- Interceptor ：錄記作來後、前的理處件物制控被求請在， HandlerInterceptorDemo LoggingInterceptor.java package onlyfun.caterpillar; import java.util.logging.Logger; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet. handler.HandlerInterceptorAdapter; public class LoggingInterceptor extends HandlerInterceptorAdapter { private Logger logger = Logger.getLogger(this.getClass().getName()); public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { logger.info( handler.getClass().getName() + " ..."); 行執始開 return true; } public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,7 2

21. Chapter 7 Spring Web MVC 架框 ModelAndView modelAndView) throws Exception { logger.info( handler.getClass().getName() + " 畢完行執..."); } public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { logger.info("畢完理處求請 ..."); }}個一這用使要 HandlerInterceptor 在須必， Bean ，義定行進中檔義定：如例 HandlerInterceptorDemo mvc-config.xml<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="loggingInterceptor" class="onlyfun.caterpillar.LoggingInterceptor"/> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="urlHandlerMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping"> <property name="interceptors"> <list> <ref bean="loggingInterceptor"/> </list> 7 21

22. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） </property> <property name="mappings"> <props> <prop key="/hello.do">helloController</prop> </props> </property> </bean> <bean id="helloController" class="onlyfun.caterpillar.HelloController"> <property name="viewPage" value="hello"/> </bean> </beans> 當；是 UrlHandlerMapping 的用使所意注SimpleUrlHandlerMapping 控在，錄記行進會都後前的理處被求請在，時求請 DispatcherServlet 過透 C onsole ：示所下如訊資的到看所）（台制圖 7.9 HandlerInterceptorDemo 面畫考參行執的 7.1.6 Controller 繼承架構是的求請理處上際實，後之求請出送者用使當實以可您， Controller ，中在，求請理處來面介 Controller 作 Spring C ontroller 容是 Spring IoC7 22

23. Chapter 7 Spring Web MVC 架框的富豐供提 Bean。例實個一的理管器 S pring Controller 根以可，構架承繼的需所成完以，別類個某承繼來求需的上際實據 Controller。理處：構架承繼的 Spring中出列下以 Controller 圖 7.10 Spring 中 Controller 構架承繼介簡別分下以 Controller ：用作之別類關相 AbstractController AbstractController 了承繼並，面介 Controller 了作實 WebContentGene- 了供提， rator 直以可您。理處的） Session （化步同與取快 s ynchronized 承繼接處來法方 AbstractController 義定新重並，handleRequestInternal() ：如例，求請理 public class SomeController extends AbstractController { public ModelAndView handleRequestInternal( HttpServletRequest request, HttpServletResponse response) throws Exception { .... return new ModelAndView("view", "modelName", model); 7 23

24. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） } .. } MultiActionController 的您，時大增模規式程在，別類個一寫撰求請個一每為果如 Controller Controller用使接直或承繼以可。加增速迅會將別類 MultiActionController 寫撰求請個一每用不而，件物個一同於中集理處求請的關相個數將，別類。件物制控個一 BaseCommandController 、 A bstractCommandController 使以可則，理管以加中件物個一至取擷值數參求請將要需果如 Command 一是，中在。別類子的別類 BaseCommandController 用 Spring C ommand 至定設並取擷數參求請將責負 JavaBean B aseCommandController ，個流理處的續後了義定則 Command ，中件物 A bstractCommandController ，義定來承繼會常通，程 AbstractCommandController CommandController ：下如子例個一 public class SomeCommandController extends AbstractCommandController { public SomeCommandController() { setCommandClass(YourCommand.class); } public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object command, BindException exception) throws Exception { YourCommand your = (YourCommand) command; ... return new ModelAndView(..); } .. } AbstractFormController7 24

25. Chapter 7 Spring Web MVC 架框，理處單表於對 A bstractFormController 單表及，數參求請理處了義定中。程流面頁的行進要所時敗失或功成交提 SimpleFormController 承繼以可，理處單表的單簡於對 SimpleFormController 定新重以可，別類理處己自要果如，法方 doSubmitAction() 義新重以可則， ModelAndView 。法方 onSubmit() 義定 AbstractWizardFormController 承繼以可，說來頁網的集收料資成完來面畫單表個數要需於對 Abstract- 來能功）（靈精的式程用應面桌像以可您， WizardFormController W izard 。單表作製個一每，紹介的單簡個作先的上以於對邊這在 Controller Controller 明說續繼將下以，明說的細詳有會都中節一下在別類 Spring Web MVC 的 API 。要主7.1.7 ModelAndView所時面畫現呈，中式程 ModelAndView 了表代別類 Spring Web MVC能只次一中法方的式程於由，件物料資與件物料資 Model View 用使 Java同您便方，件物個兩這裝封是用作的 ModelAndView 以所，件物個一傳回 Model View 。與回傳時被稱名後之，稱名的ModelAndView括包只是的單簡最 View View面介View resolver 作實是就也， org.springframework.web.servlet.View 的單簡最，等或 InternalResourceView 如例，析解例實的 JstlView Model-AndView ：下如式方構建ModelAndView(String viewName) 7 2

26. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）件物用使以可則，件物料資的需所時面畫現呈回返要果如 Model Map 下用使以可，數引的時構建為作構建在後然，料資集收來 ModelAndView ：法方構建 ModelAndView 的本版個這面 ModelAndView(String viewName, Map model) 的現呈要在以可後之，）（值與）（鍵定設中件物 Map " K ey " " V alue " 資個一回傳要您果如，）中頁網在如例（示顯以加出取中面畫 JSP Model ：本版個這面下用使以可則，稱名的 Model 定指並件物料 ModelAndView ModelAndView(String viewName, String modelName, Object modelObject) 由藉物料資 modelName 出取中別類作實的在以可您， View Model 據根並，件 View 現呈等、頁網是能可（示顯以加來術技的用使所 JSP P df 。）術技用使可也別類ModelAndView View 引的時構建為作來件物的面介：法方構建的用可個三是下以，數 ModelAndView(View view) ModelAndView(View view, Map model) ModelAndView(View view, String modelName, Object modelObject) 作實個一 View 是例實的 org.springframework.web.servlet.view. 成完來式方） RedirectView （發轉用使是設預 M odelAndView ， F orward ）（向導新重用使會則，話的用使，面畫果結的求請 RedirectView R edirect ：如例，果結的求請現呈以，置位面畫果結的定指至導重求請將7 26

27. 7 27 throws Exception { HttpServletResponse res) public ModelAndView handleRequest(HttpServletRequest req, ... " ：如例，鍵個一生產動自會法方" ，件物 a ddObject() 入加 Model 僅以可您，法方 addObject() 了增新，中M odelAndView 在 Spring 2.0 Web 。址位式程用應的它其至定指以可，頁網個一求要新重器覽瀏由是向導新重， WEB-INF 是像，錄目藏隱的中式程用應問訪能不 Web 以所，出發器覽瀏由是求請的後向導新重，訊資的向導新重現出會上列址位的器覽瀏此因，址位的定指所至接連新重會端戶客，址位求請出發新重器覽瀏端戶客求要會式程用應，話的） W eb （向導新重用使 R edirect Web 。址位式程用應的它其至定指能不，行進中式程用應在能只 Web 式方發轉，源資些這得取以可才，理處的與 Controller DispatcherServlet 過透須必而，源資些這求請接直法無就者用使此如，下 WEB-INF 到放源資的取存管控要些一將以可此因，錄目 WEB-INF 是像，錄目部內 Web 的定設所式程用應問訪以可，行進內之式程用應在是發轉且而 Web ，址位的發轉被現出會不並上列址網，話的式方）（發轉用使 F orward 。錄目式程用應是 Web FirstSpringMVC 中其，址位的樣這 MVC/pages/index.htm /FirstSpring- 像須必址位的回傳 getViewPage() 以所，錄目根的式程用應 Web是不而，始開錄目根頁網器服伺從須必定設的，邊這在 v iewPage ... } new RedirectView(this.getViewPage())); return new ModelAndView( ... public ModelAndView handleRequest(....) ... { ... 架框 Chapter 7 Spring Web MVC

28. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） User user = new User(); ... ModelAndView modelAndView = new ModelAndView(viewPage); modelAndView.addObject(user); return modelAndView; } ... 動自會則，例實是的給定設果如 addObject() onlyfun.caterpillar.User 入加果如，稱名生產來稱名面介或別類照按說是就也，為鍵生產 " " " user" null 。生發會則， IllegalArgumentException 由，定指不以可還 Spring 2.0 的 ModelAndView View 以可如例，稱名供提求請據根來 RequestToViewNameTranslator View ：寫撰下如中檔定設在 <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id=”controllerClassNameHandlerMapping” class="org.springframework.web.servlet.mvc. → support.ControllerClassNameHandlerMapping"/> <bean id="viewNameTranslator" class="org.springframework.web.servlet. → view.DefaultRequestToViewNameTranslator"/> <bean name="helloController" class="onlyfun.caterpillar.HelloController"> <property name="viewPage" value="hello"/> </bean> ... 在 HelloController 化例實中 ModelAndView 定指不若，時 View 例，：如7 28

29. Chapter 7 Spring Web MVC 架框...public ModelAndView handleRequest(HttpServletRequest req, HttpServletResponse res) throws Exception { ModelAndView modelAndView = new ModelAndView(); ... return modelAndView; }...求請果如以所，了定設於由 ControllerClassNameHandlerMapping 了定設於由，求請理處來hello.do 讓會則， HelloController RequestTo-並，時生產中ViewNameTranslator 然雖， handleRequest() ModelAndView 了合結（理處來 View 由會但，定指有沒 hello.jsp InternalResource-ViewResolver 。）定設置後與置前的7.1.8 View Resolver 的回傳據根 DispatcherServlet ModelAndView 名析解來例實 View。件物的面畫於現呈理處並，稱 Model V iew 作實給託委是析解的稱名org.springframework.web.servlet.ViewResolver ，例實的面介 View-Resolver ：下如義定面介package org.springframework.web.servlet;import java.util.Locale;public interface ViewResolver { View resolveViewName(String, Locale locale) throws ServletException;} ViewResolver 是例實個一的以可您， InternalResourceViewResolver在 viewResolver 與定設中 "prefix" "suffix" 與置前的徑路定設別分，性屬 7 2

30. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）樣這，字文置後 viewPage 個給接直，稱名別區要主的徑路打只以可就性屬：範示的定設 ... <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value=”/WEB-INF/jsp/”/> <property name="suffix" value=”.jsp”/> </bean> ... 的際實，後完析解稱名在 ViewResolve View 轉的件物與製繪 Model 作實給交是理處換，例實的面介 org.springframework.web.servlet.View View ：下如義定面介 package org.springframework.web.servlet; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public interface View { void render(Map model, HttpServletRequest request, HttpServletResponse response) throws Exception; } 是的設預如例 InternalResourceViewResolver "viewClass" Internal- 關相術技層的它其為性屬 ResourceView 定設以可也， "viewClass" View 外另，為定設如例，別類 org.springframework.web.servlet.view.JstlView 。術技的同不用適可，別類作實等 TilesView 、有還 V elocityView View 用使以可您 org.springframework.web.servlet.view.BeanNameView- Resolver ：如例，7 3

31. Chapter 7 Spring Web MVC 架框...<bean id="viewResolver" class="org.springframework.web.servlet. → view.BeanNameViewResolver"/><bean id="hello" class="org.springframework.web.servlet.view.JstlView"> <property name="url" value=”/WEB-INF/jsp/hello.jsp”/></bean>... 的回返當，中定設的上以在 ModelAndView view 為稱名 "hello" ，時 "id" 。 " hello" 的為性屬找尋去會 View Bean用使以可這，中檔性屬個一至來出立獨義定的 ViewResolver 將以可來org.springframework.web.servlet.view.ResourceBundleViewResolver ：如例，術技層示表的同不定設的際實據根以可是處好，成達 URL...<bean id="viewResolver" class="org.springframework.web.servlet. → view.ResourceBundleViewResolver"> <property name="basename" value=”views”/></bean>... 在了定設性屬 ResourceBundleViewResolver 的 "basename" "views"是也（稱名 " views" "basename" 用使將這，）值設預的 views.properties的術技層示表定設來 "viewClass" 個一如例，與 "url" views.properties 的：示所下如例範寫撰hello.class=org.springframework.web.servlet. → view.InternalResourceViewhello.url=/WEB-INF/jsp/hello.jspwelcome.class=org.springframework.web.servlet.view.JstlViewwelcome.url=/WEB-INF/jsp/welcome.jsp 7 31

32. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） other.class=org.springframework.web.servlet.view.VelocityView other.url=/WEB-INF/vm/other.vm 找尋會則，為若稱名的中例實 ModelAndView 的回傳在 view "hello" 可您，的定指及例實 hello.class hello.url 的應對到得來及 ViewClass URL 為置設上在，的同不置設區地或家國的同不為以 View "basename" 以可， "views"是定設系語果如，取讀會設預示表， views.properties en_US 準它為以可，是定設系語果如， views_en_US.properties 備準它為 zh_TW 定設域區與置設以可中案檔的應對而， views_zh_TW.properties 備 Locale View 。的關相用使以可也 org.springframework.web.servlet.view.XmlViewRe- solver ：示所下如例範的定設個一， ... <bean id="viewResolver" class="org.springframework.web.servlet.view.XmlViewResolver"> <property name="location" value=”/WEB-INF/demo-views.xml”/> </bean> ... 是設預性屬，中定設的面上在 " location" 為定設邊這， views.xml 找尋中到示表， demo-views.xml demo-views.xml View 例，義定的 Bean ：義定麼這中 demo-views.xml在如 ... <bean id="hello" class="org.springframework.web.servlet.view.JstlView"> <property name="url" value=”/WEB-INF/jsp/hello.jsp”/> </bean> ...7 32

33. Chapter 7 Spring Web MVC 架框定設與制機的作運其 BeanNameViewResolver 的傳回當，的似類是時為稱名的中例實ModelAndView view "hello" 義定找尋去會則，時 Bean 。定設的 "id" 為的中 "hello" View7.1.9 Exception Resolver例個這捉捕想您而，外例了出丟中程過行運在 JSP 或頁網果如 Servlet定設如例（外法方定設捉捕的外例關有中頁網與器容用使了除，外 JSP的素元令指web.xml 頁網定設是或，籤標 <error-page> 的 JSP "page"理處誤錯定設中檔義定的"errorPage" 在以可也，）性屬 DispatcherServlet用使如例，例實的個一定設，頁網 ExceptionResolver Beanorg.springframework.web.servlet.handler.SimpleMappingException-Resolver ：示所下如子例的定設個一，...<bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value=”/WEB-INF/jsp/”/> <property name="suffix" value=”.jsp”/></bean><bean id="exceptionResolver" class="org.springframework.web.servlet. → handler.SimpleMappingExceptionResolver"> <property name="exceptionMappings"> <props> <prop key="java.sql.SQLException">sqlexception</prop> <prop key="java.sql.IOException">ioexception</prop> </props> </property></bean>... 7 33

34. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）使時生發外例在並，用應動自會 DispatcherServlet ExceptionResolver 了生發要只，中定設的面上在如例，息訊誤錯示顯來頁網的定指用了生發而， SQLException 至接連會就， /WEB-INF/jsp/sqlexception.jsp IOException 。至接連會就， /WEB-INF/jsp/ioexception.jsp 7.2 Controller 實作類別需所作製來求需依以可，別類關相的面介 Spring Controller 作實供提，理處求請的頁網單表、集收數參求請的單簡是論無，件物 Controller 的以可別類的應對有都中 W izard 在，等計設的頁網）（靈精是至甚 Spring 。用應 7.2.1 AbstractController 是別類 org.springframework.web.servlet.mvc.AbstractController 請的者用使了作實式模 Controller 用使，作實單簡的面介 Template Method 請對驗檢、理處的）（頭標取快對了括包，程流的理處求 C aching header ）（化步同與得取的 G ET 、援支的）、（法方求 P OST S ession s ynchronized 。別類用使以可則，理處作題議些這對要需果如，等 AbstractController 行執被法方 AbstractController 從 handleRequest() DispatcherServlet ：示所下如程流作工的始開 1. DispatcherServlet 。法方行執 handleRequest() 2. 援支不法方果如，法方求請的援支驗檢來定設的 "supportedMethods" 據根 ServletException 。出丟則 3. 得取試嘗，用使要需否是求請定決定設的 "requireSession" 據根 Session Session 。出丟則 Session 得取有沒果如， ServletException7 34

35. Chapter 7 Spring Web MVC 架框4. 據根（頭標取快定設否是定決定設的 "cacheSeconds" C aching header。）5. 叫呼據根，法方 handleRequestInternal() "synchronizeOnSession" 是定決對否 Session 。）（化步同行進 s ynchronized 於對 AbstractController 以可就解了的本基個有要只，程流作工的別類承繼接直以可，了 AbstractController 義定新重並，別類 handleRequest-：如例，法方Internal()public class SomeController extends AbstractController { protected ModelAndView handleRequestInternal( HttpServletRequest request, HttpServletResponse response) throws Exception { .... return new ModelAndView("view", "modelName", model); } ..}方些一的好義定經已作操接直以可，話的別類 AbstractController 用使，式方求請的許允所定設，法方叫呼以可如例，法 setSupportedMethods() 、、援支只則，話的寫撰下如若時作實 Controller 如例 GET P OST H EAD ：求請的package onlyfun.caterpillar;...public class HelloController extends AbstractController { ... public HelloController() { this.setSupportedMethods( new String[] {"GET", "POST", "HEAD"}); } protected ModelAndView handleRequestInternal( HttpServletRequest req, HttpServletResponse res) throws Exception { ... }} 7 3

36. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）則，話的求請式方的許允不以果如 Controller 出丟會候時的理處在 org.springframework.web.servlet.support.RequestMethodNotSupported- Exception 。外例的 7.2.2 MultiActionController 與 ParameterMethodName- Resolver 個一寫撰理處的求請個一每為若，大越來越模規的式程用應果如的多越來越有中式程用應 Controller 到現發您，的快很，別類 Web 如例，別類個一在織組以可是責職些一的中當上實事而，別類 Controller 個一在織組以可就，法方等、、的關相作操庫料資與 list() a dd() d elete() 。別類：別類子個一的別類 AbstractController 用使以可您 o rg.springframe- 在您讓以可它。 work.web.servlet.mvc.multiaction.MultiActionController 的中當行執來求請的者用使據根並，法方個多義定中別類 Controller 個一。法方個某個一合配要您， MultiActionController 用使要 org.springframework. ，例實的 web.servlet.mvc.multiaction.MethodNameResolver M ultiAction- Controller 是別類的用使設預 MethodNameResolver org.springframework. 個這， web.servlet.mvc.multiaction.InternalPathMethodNameResolver 行執斷判來稱名案檔的求請後最，中址網的給所據根以可別類 Controller 行執會求請的 /test.do 如例，法方個一哪的中 test (HttpServletRequest, HttpServletResponse) 用使會不常通但。法方 InternalPathMethodName- 是像，點優些一的 Resolver 用使了去失就這為因， MultiActionController 。法方的行執要所定決來數參求請的者用使依7 36

37. Chapter 7 Spring Web MVC 架框用使在常通 MultiActionController 配搭會時 org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver 是或 o rg.springframework.web.servlet.mvc.multiaction.PropertiesMethodName- 行執要定決數參以，數參求請個一據根是都別類個兩，Resolver Controller可，例為以先邊這，法方個一哪的中別類 ParameterMethodNameResolver Bean ：寫撰麼這中檔義定在以 MultiActionDemo mvc-config.xml<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="urlMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/book.do">bookController</prop> </props> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="paraMethodResolver" class="org.springframework.web.servlet.mvc. → multiaction.ParameterMethodNameResolver"> <property name="paramName" value="action"/> <property name="defaultMethodName" value="list"/> </bean> 7 37

38. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） <bean id="bookController" class="onlyfun.caterpillar.BookController"> <property name="methodNameResolver" ref="paraMethodResolver"/> <property name="testPage" value="test"/> </bean> </beans> 設性屬用使，中義定的 " paraMethodResolver" Bean 在 "paramName" 沒中求請是若，法方的行執要所定指數參 HTTP "action" 用使中求請在定方的定設所性屬 "action" 用使會則，數參定指有 "defaultMethodName" list() 。法方是的定設邊這，法在義定中當，別類 BookController 承繼 MultiActionController "action" ：如例，法方的行執要所下定指數參 MultiActionDemo BookController.java package onlyfun.caterpillar; import javax.servlet.http.*; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc. multiaction.MultiActionController; public class BookController extends MultiActionController { private String testPage; public ModelAndView list(HttpServletRequest req, HttpServletResponse res) { return new ModelAndView( this.getTestPage(),"executed", "list"); } public ModelAndView add(HttpServletRequest req, HttpServletResponse res) {7 38

39. Chapter 7 Spring Web MVC 架框 return new ModelAndView( this.getTestPage(),"executed", "add"); } public ModelAndView delete(HttpServletRequest req, HttpServletResponse res) { return new ModelAndView( this.getTestPage(),"executed", "delete"); } public String getTestPage() { return testPage; } public void setTestPage(String testPage) { this.testPage = testPage; }} 與括包須必，中法方的義定到意注 HttpServletRequest HttpServlet- 。本版的Response 數參個三第有帶用使以可也，數參的 HttpSession試測於用，例範的單簡個一是只別類 BookController 的義定所上以目示表，串字個一定設是只理處的作所它，作運的MultiActionController者用使示顯以用，頁網的用試測個一計設以可，稱名法方的行執所前 JSP ：如例，法方的求請所 MultiActionDemo test.jsp<%@ page language="java" contentType="text/html; charset=BIG5" pageEncoding="BIG5"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=BIG5"><title>MultiAction Test Page</title></head><body> <H1> "${executed}" method is executed.</H1> 7 3

40. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） </body> </html> 行執個一，數參求請上附中址網在以可，子例的求請出發個看際實來：示所下如面畫考參的圖 7.11 MultiActionDemo 果結行執的案專 7.2.3 MultiActionController 與 PropertiesMethodNameResolver 寫撰是不而，中件物）（託委個一在織組法方有所將以可也您 d elegate ，法方的定指行執件物個這給託委，時到來求請當，中別類 Controller 在例，件物託委至考參性屬的 MultiActionController "delegate"定設要只您：下如計設以可件物託委如 MultiActionDemo2 BookDelegate.java package onlyfun.caterpillar; import javax.servlet.http.*; import org.springframework.web.servlet.ModelAndView; public class BookDelegate { private String testPage; public ModelAndView list(HttpServletRequest req, HttpServletResponse res) {7 4

41. Chapter 7 Spring Web MVC 架框 return new ModelAndView( this.getTestPage(),"executed", "list"); } public ModelAndView add(HttpServletRequest req, HttpServletResponse res) { return new ModelAndView( this.getTestPage(),"executed", "add"); } public ModelAndView delete(HttpServletRequest req, HttpServletResponse res) { return new ModelAndView( this.getTestPage(),"executed", "delete"); } public String getTestPage() { return testPage; } public void setTestPage(String testPage) { this.testPage = testPage; }} 承繼用不在現 MultiActionController 義定來別類 Controller 而，別類義定接直中檔義定在是：例實的 MultiActionController MultiActionDemo2 mvc-config.xml<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="urlMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping"> <property name="mappings"> 7 41

42. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） <props> <prop key="/book.do">bookController</prop> </props> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="paraMethodResolver" class="org.springframework.web.servlet.mvc. → multiaction.ParameterMethodNameResolver"> <property name="paramName" value="action"/> <property name="defaultMethodName" value="list"/> </bean> <bean id="bookDelegate" class="onlyfun.caterpillar.BookDelegate"> <property name="testPage" value="test"/> </bean> <bean id="bookController" class="org.springframework.web.servlet.mvc. → multiaction.MultiActionController"> <property name="methodNameResolver" ref="paraMethodResolver"/> <property name="delegate" ref="bookDelegate"/> </bean> </beans> 用使以可您 MultiActionDemo 這，果結現呈來頁網的中案專 test.jsp 與果結行執的式程個 MultiActionDemo 圖考參以可，的同相是案專 7.11 。面畫的7 42

43. Chapter 7 Spring Web MVC 架框用使以可也，式程的面上 PropertiesMethodNameResolver 將如例，Bean：容內的下以為寫改檔義定<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="urlMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/*book.do">bookController</prop> </props> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value=”/WEB-INF/jsp/”/> <property name="suffix" value=”.jsp”/> </bean> <bean id="propMethodResolver" class="org.springframework.web.servlet.mvc. → multiaction.PropertiesMethodNameResolver"> <property name="mappings"> <props> <prop key="/listbook.do">list</prop> <prop key="/addbook.do">add</prop> <prop key="/deletebook.do">delete</prop> </props> </property> </bean> <bean id="bookDelegate" class="onlyfun.caterpillar.BookDelegate"> <property name="testPage" value=”test”/> 7 43

44. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） </bean> <bean id="bookController" class="org.springframework.web.servlet.mvc. → multiaction.MultiActionController"> <property name="methodNameResolver" ref="propMethodResolver"/> <property name="delegate" ref="bookDelegate"/> </bean> </beans> 給交會都求請的尾結為有所，定設的上以據根 book.do bookController 同依，法方的行執會，時 /listbook.do 求請而，理處來bookDelegate list() 或行執來或用使別分以可，理道的樣 /addbook.do /deletebook.do a dd() l ist() ：示所下如面畫考參的行執個一，法方圖 7.12 用使 PropertiesMethodNameResolver 果結行執的 7.2.4 ParameterizableViewController 類子的別類是別類 ParameterizableViewController AbstractController 這當，性屬的它定設，義定中檔義定在接直以可，別 Bean "viewName" ，頁網的定指向導接直定設的 Controller 據根會，時行執 "viewName" 個個一計設以可如例，求請頁網對接直免避來用以可是處好的它用使 JSP 將以可，制控 index.jsp 過透都求請的有所讓了為， DispatcherServlet ：義定麼這中檔義定在接直並，下 index.jsp WEB-INF 在置放 Bean7 44

45. Chapter 7 Spring Web MVC 架框...<beans> <bean id="urlMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/index.do">indexController</prop> .... </props> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value=”/WEB-INF/jsp/”/> <property name="suffix" value=”.jsp”/> </bean> <bean id="indexController" class="org.springframework.web.servlet. → mvc.ParameterizableViewController"> <property name="viewName" value=”index”/> </bean><beans>是求請址網的接連當，定設的上以依 /index.do 定指所至接連會則，時。頁網的 /WEB-INF/jsp/index.jsp7.2.5 AbstractCommandController數參求請供提者用使到遇當， Controller 是或用使 AbstractController這將算打果如，數參求請得取中件物從行自須必，時 HttpServletRequest等換轉態型行進或輯邏關相寫撰行自須必，件物個某至定設數參求請些。作動 7 4

46. Spring 2.0 良信林（冊手術技 – http://openhome.cc ）承繼以可 org.springframework.web.servlet.mvc.AbstractCom- 當，件物 mandController 個一供提並，別類作實來 Controller Command 稱名數參求請對比著試會，時到來求請者用使 A bstractCommandController 對叫呼並，）稱名法方 Command 是就也（稱名法方 Setter 的上 setXXX 與會也，態型本基是數參的上 Setter 果如，值數參求請定設法方 Setter 的應。態型的應對為值數參求請換轉動自：別類為作別類個一了計設您設假，說來子例個舉 User Command AbstractCommandDemo User.java package onlyfun.caterpillar; public class User { private String name; private String password; public void setName(String name) { this.name = name; } public void setPassword(String password) { this.password = password; } public String getName() { return name; } public String getPassword() { return password; } } 了括包中求請果如 "name" 與 "password" 為裝封要想數參些這而，數參 User 承繼則，例實 AbstractCommandController 使以可，時作實 Controller7 46

47. Chapter 7 Spring Web MVC 架框用 setCommandClass() 定指來 Command 的它義定新重並，別類 handle() 方：如例，法 AbstractCommandDemo UserController.javapackage onlyfun.caterpillar;import java.util.HashMap;import java.util.Map;import javax.servlet.http.*;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet. mvc.AbstractCommandController;import org.springframework.validation.BindException;public class UserController extends AbstractCommandController { private String userPage; public UserController() { setCommandClass(User.class); } protected ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object command, BindException exception) throws Exception { User user = (User) command; Map model = new HashMap(); model.put("name", user.getName()); model.put("password", user.getPassword()); return new ModelAndView(getUserPage(), "userInfo", model); } public void setUserPage(String userPage) { this.userPage = userPage; } public String getUserPage() { 7 47

48. Spring 2.0 良信林（冊手術技 – http://openhome.cc ） return userPage; } } 並，例實的了得取接直，中法方 UserController 的 handle() Command 法方與作操接直，後之為面介作操換轉在 User getName() getPassword() 頁網在以，訊資集收來件物個一了用使上以在，數參求請得取來 Map JSP ：下如計設頁網設假，訊資些這現呈中 JSP AbstractCommandDemo userInfo.jsp <%@ page language="java" contentType="text/html; charset=BIG5" pageEncoding="BIG5"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=BIG5"> <title>AbstractCommandController Demo</title> </head> <body> <h1> ：稱名 ${userInfo[name]}</h1> <h1> ：碼密 ${userInfo[password]}</h1> </body> </html> 在以可著接 Bean 的關相定設中檔義定 Bean ：示所下如，訊資 AbstractCommandDemo mvc-config.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> <bean id="urlMapping" class="org.springframework.web.servlet. → handler.SimpleUrlHandlerMapping">7 48

49. Chapter 7 Spring Web MVC 架框 <property name="mappings"> <props> <prop key="/user.do">userController</prop> </props> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet. → view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="userController" class="onlyfun.caterpillar.UserController"> <property name="userPage" value="userInfo"/> </bean></beans> ：數參求請上附列址網在接直時求請在，面畫果結的行執個一看看來圖 7.13 AbstractCommandDemo 果結行執的案專7.2.6 AbstractFormController 承繼過透常通，求需單表的單簡於對 org.springframework.web.servlet. 或義定新重並，mvc.SimpleFormController 義定來 Controller onSubmit() 定程流理處單表的正真上際實而，能功單表成完來法方doSubmitAction() 7 4

50. Spring 2.0 良信林（冊手術技 – http://openhome.cc ），在義 org.springframework.web.servlet.mvc.AbstractFormController ：明說的中當下一理整邊這，用作之法方的串連一其明說有，中件文在 API 1. 。例實的個一傳回要，法方 formBackingObject() 行執 commandClass 2. ，作動等化式格作的定特 initBinder() 對您許允，法方行執 Command Field 。定設的或態型本基非供提，等式格錢金、式格期日如例 String 3. 。現展的單表於用，件物個一回返，法方 showForm() 行執 View 4. 用應則，為定設被性屬 "bindOnNewForm" 果如 true ServletRequest- 行執且並，件物單表的新個一入填來數參求請始初據根 DataBinder onBindOnNewForm() 。法方 5. showForm() 程過的單表現展在果如，法方行執會法方 referenceData() ：如例，件物個一傳回以可，料資關相些一要需，中 Map protected Map referenceData( HttpServletRequest request) throws Exception { Map ref = new HashMap(); ref.put("defalutUser", "guest"); return ref; } 用使中頁網在以可就，來一樣這 JSP ${defaultUser} ，料資現呈來法寫的。是會值的得取所如例 "guest" 6. Model 。寫填行進並單表到看以可者用使，現展被件物：行進程流的下以依會將，單表出送後之單表完寫填者用使 1. 式方的樣這用想不果如，用使常通，出送單表的者用使受接 POST POST 。法方義定新重以可，單表出送否是者用使斷判來 isFormSubmission() 2. 以法方行執會則，定設有沒性屬 "sessionForm" 果如 formBackingObject() 執則到找有沒果如，件物單表得取中從試嘗則否，件物單表得取 session7

Spring 2.0 技術手冊第七章 - Spring Web MVC 框架

Justin Lin

Spring 2.0 技術手冊第七章 - Spring Web MVC 框架