springMVC注解的配置方式

运行结果如下：

要求/步骤：

代码整体布局：

代码实现如下：

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>spring_0824_KQC</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>spring_0824_KQC Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
    <servlet.version>4.0.1</servlet.version>
    <jsp.version>2.2</jsp.version>
    <jstl.version>1.2</jstl.version>
    <spring.version>5.3.14</spring.version>
    <commons-dbcp.version>1.4</commons-dbcp.version>
    <mybatis.version>3.4.6</mybatis.version>
    <mybatis-spring.version>1.3.3</mybatis-spring.version>
    <mysql-connector-java.version>8.0.11</mysql-connector-java.version>
    <fastjson.version>1.2.78</fastjson.version>
  </properties>
  <dependencies>
    <!-- 添加javaEE支持 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet.version}</version>
      <!-- provided只在编译时支持，发布时不拷贝文件 -->
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>${jsp.version}</version>
      <!-- provided只在编译时支持，发布时不拷贝文件 -->
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>
    <!--引入spring基础模块-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!-- dbcp连接池 -->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>${commons-dbcp.version}</version>
    </dependency>
    <!-- mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!-- mybatis spring整合 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis-spring.version}</version>
    </dependency>
    <!--mybatis插件PageHelper-->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.1.0</version>
    </dependency>
    <dependency>
      <groupId>com.github.abel533</groupId>
      <artifactId>mapper</artifactId>
      <version>3.0.1</version>
    </dependency>
    <!-- mysql驱动类 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql-connector-java.version}</version>
    </dependency>
    <!--fastjson处理json数据-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>${fastjson.version}</version>
    </dependency>
    <!--lombok 简化实体内容-->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.24</version>
    </dependency>

  </dependencies>


</project>

TestController:

package com.aaa.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

//@Controller(Handler处理器):标记一个类，让该类能够处理web请求，是spring mvc下的注解
@Controller
public class TestController {
    //配置映射的路径 //@RequestMapping:请求映射，就是将请求的地址和方法绑定，请求对象的地址时，自动执行关联的方法
    @RequestMapping("/qqq.do")
    public String show(Model model){
        // Model由springMVC进行传入，代码中可以直接使用。类似于HttpServletRequest
        // 通过Model对象，带数据到页面上。本质用的是服务器转发的方式，进行页面跳转。
        model.addAttribute("aaa",10000);
        return "bbb"; //返回页面
    }

}

spring-mvc.xml:

<?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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--扫描controller包，管理其中定义的controller类-->
    <context:component-scan base-package="com.aaa.demo.controller"/>
    <!--开启注解驱动
        使用注解方式配置springMVC组件
        处理器映射器，处理器适配器，
        能够解析配置的注解完成请求:@RequestMapping
    -->
    <mvc:annotation-driven/>

    <!--配置视图解析器(ViewResolver)-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--配置视图页面前缀-->
        <property name="prefix" value="/WEB-INF/page/"/>
        <!--配置视图页面后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--配置DefaultServlet处理其他请求（静态资源）-->
    <mvc:default-servlet-handler/>

</beans>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--配置springMVC前端控制器-->
    <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <!--
                springMVC需要配置相关的组件(处理器映射器,适配器。。。)
                因此我们要自己定义配置文件，在配置文件中定义这些组件。
                如果自己没有定义这个配置文件,springMVC的前端控制器默认加载 servlet名字+servlet.xml这个文件
                找不到则报错。
                一般情况下，我们要自己在init-param中配置这个文件，param-name固定是contextConfigLocation
            -->
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <!--
            凡是以.do结尾的请求都让springMVC来处理
            <url-pattern>*.do</url-pattern>
        -->
<!--        <url-pattern>*.do</url-pattern>-->
        <!--
            斜杠配置（/)∶表示所有的默认请求都交给DisaptherServlet来处理
                        导致的问题就是请求静态资源的时候无法处理
            <url-pattern>/</url-pattern>
        -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

<!--进行版本覆盖-->

bbb.jsp:

<%--
  Created by IntelliJ IDEA.
  User: 33154
  Date: 2022/8/24
  Time: 9:39
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    ${aaa}
</body>
</html>

31.jsp:

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';

// A code block
var foo = 'bar';