springmvc <mvc:注释驱动的/>和<context:component-scan base-package="“/>

Question

我有一个Spring+SpringMVC演示，当我在spring-mvc.xml中有一个没有<mvc:annotation-driven/>的<context:component-scan base-package="com.jiehang.spring.controller"时，我无法理解如何使用<mvc:annotation-driven/>。项目也可以运行，如果是这样的话，为什么我们需要在<mvc:annotation-driven/> -mvc.xml中编写spring？任何人都可以回答我的问题。谢谢

web.xml

<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>

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

spring-mvc.xml：

<context:component-scan base-package="com.jiehang.spring.controller" />
<!-- <mvc:annotation-driven /> -->
<bean
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/pages/"></property>
    <property name="suffix" value=".jsp"></property>
</bean>

spring.xml：

<bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thinXXX" />
        <property name="username" value="XXX" />
        <property name="password" value="XXX" />
    </bean>

    <bean id="tsmCountsService" class="com.jiehang.spring.service.impl.TsmCountsServiceImpl">
        <property name="tsmCountsDao" ref="tsmCountsDao" />
    </bean>

    <bean id="tsmCountsDao" class="com.jiehang.spring.dao.impl.TsmCountsDaoImpl">
        <property name="dataSource" ref="dataSource" />
    </bean>

控制器：

@Controller
public class FundController {

    @Autowired
    private TsmCountsService tsmCountsService;

    public TsmCountsService getTsmCountsService() {
        return tsmCountsService;
    }
    public void setTsmCountsService(TsmCountsService tsmCountsService) {
        this.tsmCountsService = tsmCountsService;
    }


    @RequestMapping("/queryFund")
    public ModelAndView queryFundByFundId() {
        List<TsmCounts> funds = tsmCountsService.queryUser();
        System.out.println(funds);
        return null;
    }

}

当我输入url：http://localhost:8080/TestSpringmvc/queryFund时，我可以得到输出结果。所以，如果你不写<mvc:annotation-driven />也没关系。

Answer 1

<mvc:annotation-driven />提供了对注解驱动的MVC控制器(如@RequestMapping和@Controller)的支持，尽管它是默认行为，同时它还通过@Valid和@RequestBody/ResponseBody添加了对验证和消息体的支持。