spring mvc dispatcherservlet 07：Spring MVC用JavaConfig代替xml搭

超级通道 ：Spring MVC代码实例系列-绪论

本章主要记录如何通过JavaConfig方式代替xml搭建Spring MVC项目的实现，主要涉及以下知识点：

- @Configuration：声明一个类是配置文件

- @Bean：注册一个bean实例

- @EnableWebMvc：开启注解，等同于mvc:annotation-driven

- @ComponentScan：开启自动装配，等同于 context:component-scan

- WebApplicationInitializer接口：替代web.xml启动web项目的接口

- AbstractAnnotationConfigDispatcherServletInitializer：WebApplicationInitializer的一个实现类，负责配置DispatcherServlet、初始化Spring MVC容器和Spring容器。spring mvc dispatcherservlet

本文只是对JavaConfig配置方式的一个简单展示。spring mvc dispatcherservlet JavaConfig和XML的配置方式并不互斥，我习惯于JavaConfig和XML混搭的方式进行配置：

- 1.Spring的相关配置通过XML完成

- 2.基础服务如Solr、Redis等配置通过JavaConfig完成

- 3.业务类的bean注册和装配通过注解完成

本项目参考第一章的 Spring MVC代码实例系列-01：Spring MVC项目简单搭建与Hello Wolrd

src
\---main
        \---java
        |   \---pers
        |       \---configuration
        |       |   \---MyWebApplicationInitializer.java
        |       |   \---MySpringMVCConfiguration.java
        |       \---myspringmvc
        |           \---hello
        |               \---HelloController.java
        \---resources
        \---webapp
            \---helloworld
            |   \---helloworld.jsp
            \---WEB-INF
            \---index.jsp

可以看到，项目中没有xml文件.

<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>pers.hanchao</groupId>
  <artifactId>myspringmvc</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>mySpringMVC Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <properties>
    <final-name>myspringmvc</final-name>
    <springframework.version>5.0.0.RELEASE</springframework.version>
    <servlet-api.version>3.1.0</servlet-api.version>
    <jsp-api.version>2.0</jsp-api.version>
    <javax-mail.version>1.5.0-b01</javax-mail.version>
    <tomcat-plugin.version>2.2</tomcat-plugin.version>
  </properties>
  <dependencies>
    <!--Cannot find the class file for javax.servlet.ServletContext.-->
    <!-- servlet的jar -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet-api.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>${jsp-api.version}</version>
      <scope>provided</scope>
    </dependency>

    <!-- 验证的jar -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${springframework.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>${springframework.version}</version>
    </dependency>
  </dependencies>
  <build>
    <pluginManagement>
      <plugins>
        <!--Maven Tomcat 组件-->
        <plugin>
          <groupId>org.apache.tomcat.maven</groupId>
          <artifactId>tomcat7-maven-plugin</artifactId>
          <version>${tomcat-plugin.version}</version>
          <configuration>
            <path>/</path>
            <port>8080</port>
            <uriEncoding>UTF-8</uriEncoding>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
    <finalName>myspringmvc</finalName>
  </build>
</project>

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