SpirngMVC使用注解之前和使用注解之后的对比

使用注解之前的配置

<?xml version="1.0" encoding="UTF-8"?>
<beans
        xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
    <!--id是请求路径-->
    <bean id="/test" class="com.tv189.controller.HelloController" />
</beans>

外加一个类（实现了Controller接口）

public class HelloController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView mv = new ModelAndView();
        mv.addObject("msg","你好，李焕英！");
        mv.setViewName("testindex");
        return mv;
    }
}

使用注解后的配置

<?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:mvc="http://www.springframework.org/schema/mvc"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
        <context:component-scan base-package="com.tv189.controller" />
    <!--自动开启BeanNameUrlHandlerMapping，SimpleControllerHandlerAdapter
    mvc:annotation-driven 这个配置写上后会自动开启上面的两个组件
    并且自动注入-->
        <mvc:annotation-driven />
    <!--让springMVC不去处理静态文件 如：.css .js .html .mp3 .mp4 让这些文件不走下面的过滤-->
        <mvc:default-servlet-handler />
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
            <property name="suffix" value=".jsp" />
            <property name="prefix" value="/WEB-INF/jsp/" />
        </bean>
</beans>

类文件

@Controller
public class HelloController {

    @RequestMapping("/hello")
    public String hello(Model model){
        model.addAttribute("msg","Hello,springMVC");
        return "testindex";
    }
}

@Controller 相当于声明类实现了Controller类 并交给了spring管理
等价与
implements Controller +

@RequestMapping（"/test"） 等价于

这里可以看出在不使用注解时每写一个请求我们需要写一个实现Controller的类 并配置bean 如：

SpirngMVC使用注解之前和使用注解之后的对比

原文：https://www.cnblogs.com/yichenbusan/p/14660465.html