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！！！！
