Spring MVC 3 试用笔记——helloworld

web.xml

添加：

<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
　　<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

　　<load-on-startup>1</load-on-startup>

</servlet>
<servlet-mapping>
　　<servlet-name>mvc-dispatcher</servlet-name>
　　<url-pattern>/</url-pattern>
</servlet-mapping>

spring mvc 默认会去WEB-INF 下寻找 %servlet-name%-servlet.xml这个配置文件， 上例中该文件就为mvc-dispatcher-servlet.xml

如果想手动指定则在添加init-param即可，例如：

<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/mvc/*.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

mvc-dispatcher-servlet.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" 
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd">

　　<!--@Controller, @Service, @Configuration, etc.-->

　　<context:component-scan base-package="com.spring.mvc.controller" />

　　<!--prefix:指定view的保存路径，suffix指定文件类型-->

　　<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
　　　　<property name="prefix">
　　　　　　<value>/WEB-INF/pages/</value>
　　　　</property>
　　　　<property name="suffix">
　　　　　　<value>.jsp</value>
　　　　</property>
　　</bean>
</beans>

Controller：

@Controller
@RequestMapping("/hello")
public class HelloController {
 　　private static Logger log = Logger.getLogger(HelloController.class);

　　@RequestMapping(method = RequestMethod.GET)
　　public String printWelcome(ModelMap model) {
　　　　log.info("HelloController.printWelcome");
　　　　model.addAttribute("message", "Spring 3 MVC Hello World");
　　　　return "hello";
　　}
}

其中 RequestMapping指定这个Controller的根URL， 每个方法上指定访问该方法的方式， 如果有子路径的话也可指定子路径的value。这种方式能很好的实现RESTful的URL

例如：

@Controller
@RequestMapping("/movie")
public class MovieController {
        private static Logger log = Logger.getLogger(MovieController.class);
        
        @RequestMapping(value = "/", method = RequestMethod.GET)
        public String getMovieList(ModelMap model) {
                log.info("MovieController.getMovieList");
                model.addAttribute("hi", "this is movie list view");
                return "list";
        }
        
        @RequestMapping(value = "/{category}", method = RequestMethod.GET)
        public String getMovieCat(@PathVariable String category, ModelMap model) {
                log.info("MovieController.getMovieCat");
                model.addAttribute("category", "select move category:"+category);
                return "list";

        }
        
        @RequestMapping(value = "/{category}/{name}", method = RequestMethod.GET)
        public String getMovie(@PathVariable String name, ModelMap model) {
                log.info("MovieController.getMovie");
                model.addAttribute("movie", name);
                return "list";
        }
}

该例子的访问路径可以是这样的：http://localhost:8080/SpringMVCTest/movie/act/Ironman， URL层级直接的关系很清楚。

如果不指定上述的InternalResourceViewResolver的话，那么Controller中返回view需要指定路径,例如：

@Controller
public class HomeController {
        private static Logger log = Logger.getLogger(HomeController.class);

        @RequestMapping(value = "/home")
        public String home() {
                log.info("HomeController: Passing through...");
                return "WEB-INF/views/home.jsp";
        }

}