spring-mvc.xml中组件转化为注解形式

原

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<?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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context
                           https://www.springframework.org/schema/context/spring-context.xsd
                           http://www.springframework.org/schema/mvc
                           http://www.springframework.org/schema/mvc/spring-mvc.xsd"
>

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

    <mvc:default-servlet-handler/>

    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/>
            <bean class="com.nju.interceptors.MyInterceptors"/>
        </mvc:interceptor>
    </mvc:interceptors>

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

</beans>

新

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// ./com/nju/config
@Configuration
@ComponentScan("com.nju.controller")
@EnableWebMvc
public class SpringMvcConfig {

    @Bean
    public CommonsMultipartResolver multipartResolver() {
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
        multipartResolver.setDefaultEncoding("UTF-8");
        multipartResolver.setMaxUploadSize(5000000);
        return multipartResolver;
    }

}
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// ./com/nju/controller
@Component
public class MyWebMvcConfigurer implements WebMvcConfigurer {

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptors()).addPathPatterns("/**");
    }

}

DispatcherServlet加载核心配置类

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// ./com/nju/config
public class MyAnnotationConfigWebApplicationContext extends AnnotationConfigWebApplicationContext {

    public MyAnnotationConfigWebApplicationContext() {
        super.register(SpringMvcConfig.class);
    }

}
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<!--web.xml-->
<servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextClass</param-name>
        <param-value>com.nju.config.MyAnnotationConfigWebApplicationContext</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
</servlet>