第63节:Java中的Spring MVC简介笔记

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作者:达叔小生

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前言

感谢! 承蒙关照~

Java中的Spring MVC简介笔记

`MVC`简介

Spring MVC 基本概念
Spring MVC 项目搭建

`maven`

使用Spring MVC进行开发

实现数据绑定和文件上传

`MVC`

mvc是开发web架构的通用方式.

Front Controller(MVC)前端控制器,Front controller到Controller到View template,用户页面.

前端控制器

前端控制器用于分发调度,而控制器用于业务数据抽取,view template用于页面呈现.

`MVC`的本质

mvc的本质是将业务数据的抽取与业务逻辑的呈现想分离.(数据和呈现分离).

什么是所谓的`mvc`

mvc - Model-View-Controller

程序中的view是视图层,用于提供ui,是用来呈现数据的.模型层是业务数据的信息的表示.

模型层:

// 业务信息的构成
public class Course {
 private Integer courseId;
 private String title;
 private Integer learningNum;
 private Integer level;
 private String imgPath;
 
 private List<Chapter> chapterList;
 public Integer getCourseId(){
  return courseId;
 }
 public void setCourseId(Integer courseId){
  this.courseId = courseId;
 }
 public String getTitle(){
  return title;
 }
 public void setTitle(String title){
  this.title = title;
 }
 public Integer getLearningNum(){
  return learningNum;
 }
}

视图和模型- Controller控制器,控制层,作用是将数据传递给视图层,用于呈现.

mvc是一种架构模式,用于呈现的分层,分工合作,模型层,视图层,控制层.

spring mvc概念:

DispatcherServlet

controller - HandlerAdapter表现形式

集合

DispatcherServlet
Controller
HandlerAdapter
HandlerInterceptor
HandlerMapping
HandlerExecutionChain
ModelAndView
ViewResolver
View

`DispatcherServlet`重点

View Controller DispatcherServlet -> Request -> HandlerMapping -> Controller -> HandlerInterceptor -> Hander/HandlerAdapter

ModelAndView -> DispatcherServlet -> ViewResolver -> View -> Response

结构

DispatcherServlet

Common Services ->

Locale Resolution
Theme Resolution
Multipart(File Upload) Handing

Controller

HandlerMapping
HandlerInterceptor
Handler
-Data Binding
-Validation, Type Conversion, Formatting
-Invoke Service Layer
-Update Model and State
HandlerExceptionResolver

View

ViewResolver
View

spring mvc项目搭建-maven

// maven
pom(project object model) - an xml file(pom.xml)
// contains information
dependency management
coordinates

坐标`Coordinates`

groupId
artifactId
version
packaging

`maven`安装

下载解压maven,配置环境变量,(M2_HOME,Path),配置maven配置文件.

`(M2_HOME,Path)`

配置文件:

%HOME%.m2

复制settings.xml文件到.m2下

打开.m2下文件settings.cml文件

配置:

     <mirror>
        <id>UK</id>
        <name>UK Central</name>
        <url>http://uk.maven.org/maven2</url>
        <mirrorOf>central</mirrorOf>
     </mirror>

`maven`创建项目

eclipse -> eclipse kepler sr2 packages

eclipse -> window -> preferences -> maven -> Installations -> add -> 'maven-apache-maven-x.x.x->user settings`中确保路径正确.

mvn archetype:generate -DgroupId=dashucoding-arthur -DartifactId=spring-mvc-study
-DarchetypeArtifactId=maven-archetype-webapp

点击回车键-都回车键

项目

Import -> maven -> existion maven projects -> spring-mvc-study /pom.xml

spring-mvc-study -> properties -> java build path -> spring-mvc-study/src/main/java(missing)

main -> folder -> java -> pom.xml

packaging: jar

点击pom.xml

@Controller
@RequestMapping("/hello")
public class HelloMvcController{
 @RequestMapping("/mvc");
 // host:8080/hello/mvc
 public String helloMvc(){
  return "home";
 }
}

mvn jetty:run

`spring mvc`操作

DispatcherServlet
WebApplicationContext
WebApplication

controller
model
service

@Controller
@RequestMapping("/courses")
public class CourseController {
 private static Logger log = LoggerFactory.getLogger(CourseController.class);
 private CourseService courseService;
}

`Controller`

@Controller
@RequestMapping
URL template(@RequestParam and @PathVarialbe)
HttpServletRequest and / or HttpSession

`Binding`绑定

是将请求中的字段按照名字匹配的原则填入模型对象.

CourseController.java

@RequestMapping(value="/admin", method=RequestMethod.GET, params="add")
public String createCourse(){
 return "course_admin/edit";
}

package com.model;

`FileUpload`单文件上传

文件上传:

<dependency>
 <groupId> commons-fileupload </groupId>
 <artifactId> commons-fileupload </artifactId>
 <version>1.3.1</version>
</dependency>

`JSON`

json是一种轻量级的格式

ContentNegotiatingViewResolver
ResponseEntity
@ResponseBody/@ResquestBody

知识点

@RequestMapping
@PathVariable
@Controller
redirect/forward
MultipartFile
@ModelAttribute
@ResquestBody
@RequestParam
@ResponseBody
enctype="multipart/form-data"
multipartResolver
ResponseEntity

达叔小生：往后余生，唯独有你
You and me, we are family !
90后帅气小伙，良好的开发习惯；独立思考的能力；主动并且善于沟通
简书博客：达叔小生
https://www.jianshu.com/u/c785ece603d1

结语

下面我将继续对其他知识深入讲解，有兴趣可以继续关注
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第63节:Java中的Spring MVC简介笔记