第一隻SpringMVC

在Eclipse 中先建立一個Dynamic Web Project

並選擇自動產生web.xml

在Config 中選convert to Maven Project,載入相關的jar

<properties>
<spring.version>5.2.3.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<! — Spring dependencies →
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
</dependencies>

接下來 配置Web.xml

<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>

其中org.springframework.web.servlet.DispatcherServlet 的類別可參考下圖

接下來配置spring-mvc.xml,在Java Resources 中建立一個資料夾，存放spring-mvc.xml

建立spring-mvc.xml 檔案內容:加上

<context:component-scan base-package=”com.Ian.controller”></context:component-scan>，

使其去讀取com.Ian.controller 的值

調整web.xml 使其可以讀取到spring-mvc.xml

建立controller

利用@Controller 宣告這個類別為一個controller

@RequestMapping ，網址中有hello的會轉到hello()執行

利用ModelAndView.addObject()將資料包在key and value中

利用setViewName將結果導到/WEB-INF/jsp/success.jsp

package com.Ian.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class HelloController {
@RequestMapping(“/hello”)
    public ModelAndView hello() {
            System.out.println(“Run HelloController “);
            ModelAndView mv = new ModelAndView();
            mv.addObject(“message”,” 媽~我在這裡”);
           mv.setViewName(“/WEB-INF/jsp/success.jsp”);
          return mv;}
}

執行訪問

http://localhost:8080/MyWeb/hello.action