Spring MVC基础（二）-- 映射器和适配器配置_springmvc适配器配置-优快云博客

从（Spring MVC基础（一）-- 基本原理）文章中可以知道，Spring MVC开发过程中程序员只需要开发Handler（具体Controller处理方法）和View（jsp等），其他的开发组件（前端控制器DispatcherServlet、处理器映射器HandlerMapping、处理器适配器HandlerAdapter和视图解析器ViewResolver）不需要程序员开发，只需要配置就可以使用了，因此本文主要介绍下怎么配置这几个开发组件。（由于Spring MVC基础（一）-- 基本原理中简单配置过web.xml文件，所以此处不再配置）

2、基于BeanNameUrl方式的配置

2.1 springmvc.xml中的配置

<?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: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
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    
    <bean name="/viewUser" class="com.user.controller.UserController"/>
    <!-- 通过bean的name值作为url找对应的Handler -->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
    <!-- 此种方式配置的处理器适配器需要Handler实现Controller接口 -->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
    <!-- 此种方式采用物理地址识别的方式解析jsp -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/>
</beans>

2.2 Controller中代码

package com.user.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

public class UserController implements Controller {
	@Override
	public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) 
            throws Exception {
		ModelAndView mav = new ModelAndView();
		mav.addObject("viewFlag", "ViewUserByBeanName");
		mav.setViewName("/WEB-INF/user/viewUserInfo.jsp");
		return mav;
	}
}

2.3 测试结果

3、基于SimpleUrl方式的配置

3.1 springmvc.xml中的配置

<bean id="viewUserUrl" class="com.user.controller.UserController"/>
<!-- 通过url找对应的Handler -->
<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping" >
	<property name="mappings">
		<props>
			<!-- 此处可配置多个url -->
			<prop key="/viewUserInfo">viewUserUrl</prop>
		</props>
	</property>
</bean>
<!-- 此种方式配置的处理器适配器需要Handler实现HttpRequestHandler接口 -->
<bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" />

3.2 Controller中代码

package com.user.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.HttpRequestHandler;

public class UserController implements HttpRequestHandler {
	@Override
	public void handleRequest(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
		request.setAttribute("viewFlag", "ViewUserByUrl");
		request.getRequestDispatcher("/WEB-INF/user/viewUserInfo.jsp").forward(request, response);
	}
}

3.3 测试结果

4、基于注解方式的配置

4.1 springmvc.xml中的配置

<!-- 扫描Handler -->
<context:component-scan base-package="com.user.controller" />
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" />

4.2 Controller中代码

package com.user.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class UserController {
	// 方式1
	@RequestMapping("/viewUserByAnnotation1")
	public ModelAndView viewStudent1() {
		ModelAndView mav = new ModelAndView();
		mav.addObject("viewFlag", "ViewUserByAnnotation1");
		mav.setViewName("/WEB-INF/user/viewUserInfo.jsp");
		return mav;
	}
	
	// 方式2
	@RequestMapping("/viewUserByAnnotation2")
	public String viewStudent2(Model model) {
		model.addAttribute("viewFlag", "ViewUserByAnnotation2");
		return "/WEB-INF/user/viewUserInfo.jsp";
	}
}

4.3 测试结果

5、基于Spring MVC默认方式的配置

5.1 springmvc.xml中的配置

<context:component-scan base-package="com.user.controller" />
<!-- 使用默认配置 -->
<mvc:annotation-driven />
<!-- 采用逻辑视图的方式解析jsp -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
	<property name="prefix" value="/WEB-INF/"></property>
	<property name="suffix" value=".jsp"></property>
</bean>

5.2 Controller中代码

package com.user.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class UserController {
	@RequestMapping("/viewUserByDefault")
	public String viewUser(Model model) {
		model.addAttribute("viewFlag", "viewUserByDefault");
		return "user/viewUserInfo";
	}
}