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HandlerExecutionChain

SpringMVC動(dòng)態(tài)概念

DispatcherServlet 作為中間橋梁，當(dāng)它的頁面攔截到request時(shí)，將請(qǐng)求代理給HandlerMapping，由其找到Controller和HandlerInterceptor形成一個(gè)HandlerExcutionChain，DispatcherServlet再調(diào)用Handler/HandlerAdapter生成ModelAndView返回給DispatcherServlet，DispatcherServlet調(diào)用ViewResolver生成view，由ModelAndView做模型數(shù)據(jù)和視圖傳遞給View,此時(shí)就能在頁面看到用戶界面了。

SpringMVC基本概念

HandlerAdapter

MVC的概念

Springmvc流程圖

使用json格式返回查詢結(jié)果

1、使用@ResponseBody注解

2、使用ResponseEntity<T>?作為返回值

上傳文件功能是Spring?mvc自帶的服務(wù)，需要進(jìn)行配置即可使用

jsp文件上傳

<form?method="post"?action="/courses/doUpload"?enctype="multipart/form-data">
<input?type="file"?name="file"/>
<input?type="submit">
</form>

使用HttpServletRequest來處理請(qǐng)求，需要在pom中引入依賴

SpringMVC的動(dòng)態(tài)概念： 1.用戶發(fā)送請(qǐng)求request 2.DispatcherServlet攔截request ?就需要找到一個(gè)Controller 如何找？ 3.DispatcherServlet就把功能代理給了HandlerMapping 4.HandlerMapping根據(jù)配置 ?通過annotation找到Controller也找到了HandlerInterceptor 形成了一個(gè)HandlerExcutionChain 作為一個(gè)Handler或者是HandlerAdapter返回給DispatcherServlet 5.DispatcherServlet調(diào)用這個(gè)Handler或者是HandlerAdapter（找到Controller，Controller目的：生成ModelAndView） 生成ModelAndView 并返回給DispatcherServlet 6.DispatcherServlet調(diào)用ViewResolver（視圖解析器）方法 返回View對(duì)象給DispatcherServlet 7.DispatcherServlet調(diào)用ModelAndView作為模型數(shù)據(jù)傳遞給我們的View完成了呈現(xiàn) 返回給DispatcherServlet 8.DispatcherServlet再把視圖響應(yīng)給用戶 --------------------------------------------- 1.DispatcherServlet，HandlerMaping 只需要配置 2.Handler/HandlerAdapter忽略掉 3.Controller需要自己寫 4.HandlerInterceptor（Controller調(diào)用前后干點(diǎn)啥）是一個(gè)接口，需要就寫不需要就不用實(shí)現(xiàn) 5.ModelAndView：只是一個(gè)類 ?也可以使用Map把需要的放進(jìn)去就好了 6.ViewResolver和HandlerMapping差不多只需要知道使用那種類型就可以了 7.view：不需要管具體的呈現(xiàn)。只需要管是哪一個(gè)就好了

傳統(tǒng)方式傳參：使用@RequestParam（“courseId”）進(jìn)行綁定，當(dāng)需要指定處理的請(qǐng)求方式時(shí)，加上method屬性值

restful風(fēng)格傳參：使用@PathVariable（“courseId”）進(jìn)行綁定，同樣需要在RequestMapping的value屬性中進(jìn)行聲明，value=“/view2/{courseId}”

pom.xml文件

<dependencyManagement>		<dependencies>			<dependency>				<groupId>org.springframework</groupId>				<artifactId>spring-framework-bom</artifactId>				<version>${spring.version}</version>				<type>pom</type>				<scope>import</scope>			</dependency>		</dependencies>	</dependencyManagement>	<dependencies>		<dependency>			<groupId>org.springframework</groupId>			<artifactId>spring-webmvc</artifactId>		</dependency>		<dependency>			<groupId>commons-lang</groupId>			<artifactId>commons-lang</artifactId>			<version>${commons-lang.version}</version>		</dependency>		<dependency>			<groupId>org.slf4j</groupId>			<artifactId>slf4j-log4j12</artifactId>			<version>${slf4j.version}</version>			<exclusions>				<exclusion>					<groupId>org.slf4j</groupId>					<artifactId>slf4j-api</artifactId>				</exclusion>			</exclusions>		</dependency>		<dependency>			<groupId>junit</groupId>			<artifactId>junit</artifactId>			<version>3.8.1</version>			<scope>test</scope>		</dependency>		<dependency>			<groupId>javax.servlet</groupId>			<artifactId>javax.servlet-api</artifactId>			<version>3.0.1</version>			<scope>provided</scope>		</dependency>		<dependency>			<groupId>javax.servlet.jsp</groupId>			<artifactId>jsp-api</artifactId>			<version>2.2</version>			<scope>provided</scope>		</dependency>		<dependency>			<groupId>jstl</groupId>			<artifactId>jstl</artifactId>			<version>1.2</version>		</dependency>	</dependencies>	<build>		<finalName>testWebMaven</finalName>		<plugins>			<plugin>				<groupId>org.apache.tomcat.maven</groupId>				<artifactId>tomcat7-maven-plugin</artifactId>				<version>2.2</version>			</plugin>		</plugins>	</build>

web.xml文件

<!DOCTYPE?web-app?PUBLIC?"-//Sun?Microsystems,?Inc.//DTD?Web?Application?2.3//EN"?"http://java.sun.com/dtd/web-app_2_3.dtd"?><web-app>??<display-name>Archetype?Created?Web?Application</display-name>????<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>/WEB-INF/configs/spring/mvc-dispatcher-servlet.xml</param-value>??	</init-param>??	<load-on-startup>1</load-on-startup>??</servlet>??<servlet-mapping>??<!--?攔截所有請(qǐng)求?-->??	<servlet-name>mvc-dispatcher</servlet-name>??	<url-pattern>/</url-pattern>??</servlet-mapping></web-app>

mvc-dispatcher-servlet.xml文件

<?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.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">	<!--?掃描注解?-->	<context:component-scan		base-package="com.imooc.mvc"></context:component-scan>	<!--?注解驅(qū)動(dòng)?-->	<mvc:annotation-driven></mvc:annotation-driven>	<!--?過濾靜態(tài)資源?-->	<mvc:resources?location="/imags/"?mapping="/imags/**"></mvc:resources>	<bean?class="org.springframework.web.servlet.view.InternalResourceViewResolver">		<property?name="viewClass"?value="org.springframework.web.servlet.view.JstlView"/>????????<property?name="prefix"?value="/WEB-INF/configs/jsps/"/>????????<property?name="suffix"?value=".jsp"/>????</bean></beans>

Spring?MVC的工作原理示意圖

Srping?MVC的動(dòng)態(tài)概念

• request通過http請(qǐng)求發(fā)送給dispatcherServlet，dispatcherServlet通過HandlerMapping找到指定的controller，由控制器執(zhí)行具體的業(yè)務(wù)邏輯代碼

• controller執(zhí)行完畢之后，會(huì)返回modelandview給DispatcherServlet

• DispatcherServlet調(diào)用viewResolver，判斷返回給用戶那個(gè)頁面