spring mvc

intercaptor对controller前后的操作

springmvc结构图

Spring MVC

JSON

JSON

文件上传

forward & redirect

Controller

import 的 model 是 “import org.springframework.ui.Model;”，而不是maven里的model类

Spring MVC

DispatcherServlet

Maven

修改中心仓库

mvn -version

Maven

Spring MVC

Spring MVC

MVC 架构

Front Controller

虽然和教程里的运行结果一样，但是很多地方我不理解，所以下面的代码里很可能有错误的地方

web.xml

<!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>
   <!--DispatcherServlet对应的上下文配置，默认为/WEB-INF/$servlet-name$-servlet.xml，下面语句改变了该默认参数
   -->
   <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>
  <servlet-name>mvc-dispatcher</servlet-name>
  <url-pattern>/</url-pattern>
  </servlet-mapping>
  
</web-app>

------------------------------------------------------------------------------------------

mvc-dispatcher-servlet

<?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-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<context:annotation-config/>

<!-- 让DispatcherServelt上下文只搜索@Controller标注的类，不搜索其他标注的类 -->
<context:component-scan base-package="com.imooc.mvcdemo.controller" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>

<mvc:annotation-driven />

<!-- viewResolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="ViewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsps/" />
<property name="suffix" value=".jsp"/>
</bean>

</beans>

---------------------------------------------------------------------------------------------

pom.xml（与教程中不太一样，教程里的一些东西我没有写上去）

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.how2java</groupId>
  <artifactId>springmvc2021071501</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>springmvc2021071501 Maven Webapp</name>
  <url>http://maven.apache.org</url>
  
  <dependencyManagement>
      <dependencies>
          <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-framework-bom</artifactId>
          <version>${spring.version}</version>
          <type>pom</type>
          
          </dependency>
      </dependencies>
  </dependencyManagement>
  
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.43</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.0-b07</version>
    </dependency>
    <dependency>
        <groupId>apache-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>2.1</version>
        <type>pom.lastUpdated</type>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.13.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-maven-plugin</artifactId>
        <version>9.3.0.M1</version>
        <type>maven-plugin</type>
    </dependency>
  </dependencies>
  <build>
    <finalName>springmvc2021071501</finalName>
    <plugins>
        <plugin>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-maven-plugin</artifactId>
            <version>9.3.0.M1</version>
        </plugin>
    </plugins>
  </build>
</project>

------------------------------------------------------------------------------------------

文件位置：

Controller处理

异步请求，赋值

引入Json类后，定义相关方法

json服务的2种模式

1. @RequestMapping(value="/{courseId}",method=RequestMethod.GET)

   public @ResponseBody Course getCourseInJson（@PathVariable Integer courseId）

2. @RequestMapping(value="/jsontype/{courseId}",method=RequestMethod.POST)

   public ResponseEntity<Course> getCourseInJson(@PathVariable Integer courseId)

文件上传：

继承Multipartfile类

绑定参数方法、重定向路径

Contrller 传统方式

利用HttpServletRequest处理请求参数，使用request.setAttribute("course",course)传参

//  /courses/view3?courseId=456 形式的URL

@RequestMapping("view3")

public String viewCourse3(HttpServletRequest request){

    Integer courseId = Integer.valueOf(request.getParameter("courseId"));

    log.debug("In viewCourse3 ,courseId = {}",courseId);

    Course course = courseService.getCoursebyId（courseId）;

    request.setAttribute("course",course);

    return "course_overview";

}

@Controller 定义

@RequestMapping映射路径，定义被拦截路径

URL template(@RequestParam   and  @PathVariable) 入参定义方法，普通模式：@RequestParam ，Restful模式：@PathVariable

Controller 现代方式

Controller 现代方式

两种URL请求模

1. 传统URL请求路径

2. Restful方式URL请求路径

两种Model定义

1. Model model定义，对应传参方法：model.addAttribute(course)

2. Map<String,Object> model定义，对应传参方法：model.put("course",course)

SpringMVC基本概念

SpringMVC概念：

什么是MVC?