springMVC的基本配置

先用idea创建mavn项目，在根目录的pom.xml配置文件中添加项目依赖。

添加文件的打包方式为war包

<packaging>war</packaging>

　　在 dependencies下面添加依赖：

<dependencies>
        <!--        mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>

        <!--        spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.18</version>
        </dependency>
        <!--        日志-->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring5</artifactId>
            <version>3.0.15.RELEASE</version>
        </dependency>

    </dependencies>

子src->main->创建webapp目录文件夹

在webapp下创建web.xml配置文件

在web.xml中注册前端控制器

<servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>

        <!--        将前端控制器DispatcherServlet初始化时间提前到服务器启动时-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

随后在resource文件夹下创建springMVC.xml配置文件

在main->java中创建包以及控制器类

接下来在springMVC.xml中配置扫描器来识别组件

<?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"
       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">

<!--    扫描组件-->
    <context:component-scan base-package="com.vack.mvc.controller"></context:component-scan>

    <!-- 配置Thymeleaf视图解析器 -->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">

                        <!-- 视图前缀 -->
                        <property name="prefix" value="/WEB-INF/templates/"/>

                        <!-- 视图后缀 -->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8" />
                    </bean>
                </property>
            </bean>
        </property>
    </bean>



</beans>

根据上面的配置信息，WEB-INF下面创建templates文件夹。

类和路由的匹配：

@Controller
public class TestController {

    @RequestMapping("/")
    public String Show(){
        return "index";
    }
}

可以设置路由的匹配方式：

@Controller
//@RequestMapping("/blog")
public class TestController {

    @RequestMapping("/")
    public String Show(){
        return "index";
    }

    @RequestMapping(
            value = {"/msg","/test"},
            method = {RequestMethod.GET,RequestMethod.POST}
    )
    public String msg(){
        return "msg";
    }
}

有更准确的mapping请求方法：

 @PostMapping("/msg")
    public String msg(){
        return "msg";
    }