spring-in-action-mvc-helloworld

spring-in-aciton-mvc-helloWorld代码

本章纪录最小单元的mvc，hello world

首先是对这张图有个一般的概念，核心为DispatchServlet，包括HandlerMapping和ViewResolver, HandlerInterceptor等等



对于一个最小单元的hello world mvc首先创建maven工程

mvn archetype:generate -DgroupId=cuimiao-spring -DartifactId=spring-in-action-mvc-demo -DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false

创建完成后需要引入pom文件，对于一个基本的单元，以下依赖即可

<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>cuimiao-spring</groupId>
<artifactId>spring-in-action-mvc-imooc</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>spring-in-action-mvc-imooc Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<commons-lang.version>2.6</commons-lang.version>
<slf4j.version>1.7.6</slf4j.version>
<spring.version>4.1.3.RELEASE</spring.version>
<jackson.version>2.5.4</jackson.version>
</properties>

<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>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
<exclusions>
<exclusion>
<artifactId>slf4j-api</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>

<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>

<!--这没有版本号是因为上面已经指定了版本-->
<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>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.2.2.v20140723</version>
</plugin>
</plugins>
</build>
</project>

引入pom后需要对web.xml进行配置，其实就是配置一个servlet

<!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>

<!-- DispatcherServlet, Spring MVC的核心 -->
<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，现在init－param定义了一个新的位置
-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/conf/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>
<!-- mvc-dispatcher拦截所有的请求-->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

这里需要serlet－name相对应，mapping告诉需要拦截哪些request，init－param告诉mvc的核心DispatchServlet的配置在哪？？？？这里放在了/WEB-INF/conf/spring/mvc-dispatcher-servlet.xml，DispatchServlet的配置如下

<?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">

<!-- 本配置文件是工名为mvc-dispatcher的DispatcherServlet使用， 提供其相关的Spring MVC配置 -->

<!--启用Spring基于annotation的DI, 使用户可以在Spring MVC中使用Spring的强大功能。 激活 @Required @Autowired,JSR 250's @PostConstruct, @PreDestroy and @Resource 等标注 -->
<!--告诉可以用激活依赖注入（注释的方法）-->
<context:annotation-config />

<!--告诉上下文扫描范围，扫描什么类型的-->
<!-- DispatcherServlet上下文， 只管理@Controller类型的bean， 忽略其他型的bean, 如@Service -->
<context:component-scan base-package="com.spring.mvc">
<context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller" />
</context:component-scan>

<!-- HandlerMapping, 无需配置， Spring MVC可以默认启动。 DefaultAnnotationHandlerMapping annotation-driven HandlerMapping -->
<!-- 告诉可以用mapping进行映射url；这个主要是用controller的mapping；扩充了注解驱动，可以将请求参数绑定到控制器参数 -->
<mvc:annotation-driven />

<!--<!– 静态资源处理， css， js， imgs –>-->
<!--<mvc:resources mapping="/resources/**" location="/resources/" />-->

<!--告诉dispatchServlet用哪个viewResolver；告诉页面放在哪了-->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<!--前缀-->
<property name="prefix" value="/WEB-INF/static/jsp/" />
<!--后缀 home ＝ /WEB-INF/static/jsp/home.jsp-->
<property name="suffix" value=".jsp" />
</bean>

</beans>

最后写一个简单的controller

package com.spring.mvc.controller;

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

/**
* Created by cuimiao on 15/12/22.
*/
@Controller
@RequestMapping("/hello")
public class HelloWorldController {

@RequestMapping("/world")
public String helloWorld (){
return "home";
}
}

整体的结构为



完事！！！！