Edzy_Java

下面開始開發Spring MVC應用程序

（2）修改WEB-INF目錄的web.xml

?定義DispatcherServlet來控制所有的請求，同時具有一個標準的servlet-mapping映射到*.htm URL模式

?? < servlet >
???? < servlet - name > springapp </ servlet - name >
???? < servlet - class > org.springframework.web.servlet.DispatcherServlet </ servlet - class >
???? < load - on - startup > 1 </ load - on - startup >
?? </ servlet >
?
?? < servlet - mapping >
???? < servlet - name > springapp </ servlet - name >
???? < url - pattern > * .htm </ url - pattern >
?? </ servlet - mapping >

創建springapp-servlet.xml（應用程序名--servlet.xml），配置DispatcherServlet要使用的Web應用程序context

定義名為springappController的Bean條目，指向SpringappController控制器

使用SimpleUrlHandlerMapping來定義URL映射，將/hello.htm映射到SpringappController控制器

<? xml?version = " 1.0 " ?encoding = " UTF-8 " ?>
<! DOCTYPE?beans?PUBLIC? " -//SPRING//DTD?BEAN//EN " ? " http://www.springframework.org/dtd/spring-beans.dtd " >
?
<!--
?? - ?Application?context?definition? for ? " springapp " ?DispatcherServlet.
?? -->
?
< beans >
???? < bean?id = " springappController " ? class = " SpringappController " />
?
???? < bean?id = " urlMapping " ? class = " org.springframework.web.servlet.handler.SimpleUrlHandlerMapping " >
???????? < property?name = " mappings " >
???????????? < props >
???????????????? < prop?key = " /hello.htm " > springappController </ prop >
???????????? </ props >
???????? </ property >
???? </ bean >
</ beans >

（8）拷貝jars到WEB-INF/lib目錄

將dist/spring.jar、lib/jakarta-commons/commons-logging.jar、lib/log4j/log4j-1.2.8.jar文件導入到springapp工程的springapp/WEB-INF/lib目錄下

（9）創建控制器

實現Controller接口的handleRequest()方法來處理請求

這里添加日志記錄，檢查是否執行到這里

handleRequest()方法返回的ModelAndView沒有指定Model，所以直接重定向到指定的視圖hello.jsp

import ?org.springframework.web.servlet.mvc.Controller;
import ?org.springframework.web.servlet.ModelAndView;
?
import ?javax.servlet.ServletException;
import ?javax.servlet.http.HttpServletRequest;
import ?javax.servlet.http.HttpServletResponse;
?
import ?java.io.IOException;
?
import ?org.apache.commons.logging.Log;
import ?org.apache.commons.logging.LogFactory;
?
public ? class ?SpringappController? implements ?Controller? {
?
???? /**?*/ /** ?Logger?for?this?class?and?subclasses? */
???? protected ? final ?Log?logger? = ?LogFactory.getLog(getClass());
?
???? public ?ModelAndView?handleRequest(HttpServletRequest?request,?HttpServletResponse?response)
???????????? throws ?ServletException,?IOException? {
?
????????logger.info( " SpringappController?-?returning?hello?view " );
?
???????? return ? new ?ModelAndView( " hello.jsp " );
????}
}

（10）創建視圖hello.jsp

< html >
???? < head >< title > Example?::?Spring?Application </ title ></ head >

???? < body >
???????? < h1 > Hello? - ?Spring?Application </ h1 >
???????? < p > Greetings. </ p >
???? </ body >
</ html >