何謂MVC
MVC是Model View Controller的縮寫，它是一種Design Pattern，簡單來說：它把一個應用系統切分為三個角度(責任)去看。
Model : (模型)即是負責處理業務邏輯及資料行為的元件，Model不關心會被如何呈現或是操作，它只專注於業務邏輯與資料行為。
View : (視圖)即是負責處理及反應Model的呈現，所以View會需要監視Model的變化。
Controller : (控制器)即是負責組織Model及View，控制應用系統的流程。
Spring MVC基本架構
開發工具
JDK : version 1.6.0_35IDE : Eclipse Juno Service Release 2(version 4.2.2)
Application Server : Tomcat 6.0.32
Framework : Spring Framework 3.2.2
專案架構
Build Path設定
將下列jar檔加入- commons-logging-1.1.1.jar
- spring-beans-3.2.2.RELEASE.jar
- spring-context-3.2.2.RELEASE.jar
- spring-context-support-3.2.2.RELEASE.jar
- spring-core-3.2.2.RELEASE.jar
- spring-expression-3.2.2.RELEASE.jar
- spring-web-3.2.2.RELEASE.jar
- spring-webmvc-3.2.2.RELEASE.jar
Deployment Assembly設定
這個一定要設，不然會造成相關的jar沒包到WAR中，到時候抓蟲就抓到天荒地老了
寫一支Controller及一支View
Controller:HelloController.java程式碼
package com.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
@RequestMapping(value="/welcome")
public class HelloController {
@RequestMapping(method=RequestMethod.GET)
public String printWelcome(ModelMap model){
model.addAttribute("message", "Spring 3 MVC Hello World");
return "hello";
}
}
View:Hello.jsp程式碼
<html>
<body>
<h1>Message : ${message}</h1>
</body>
</html>
設定Spring
web.xml內容
<web-app id="WebApp_ID" version="3.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<display-name>Spring Hello World</display-name>
<servlet>
<servlet-name>springDispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/spring/spring-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springDispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>springDispatcher</servlet-name>
<url-pattern>/welcome.html</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>welcome.html</welcome-file>
</welcome-file-list></web-app>
spring-context.xml內容
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:component-scan base-package="com.demo.controller" />
<bean id="unAuthenticatedUrlMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/welcome.do">welcomeController</prop>
<prop key="/welcome.html">welcomeController</prop>
</props>
</property>
</bean>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/view/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<bean id="welcomeController"
class="com.demo.controller.HelloController">
</bean>
</beans>
Tomcat安裝與設定
Tomcat的安裝其實還滿簡單的，這裡只列出重要的設定
在完成上述這些動作後，就可以讓你的專案 run on server 的方式執行。
測試結果如下:
