引入依赖：

 <dependencies>
        <!--springmvc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>6.1.4</version>
        </dependency>
        <!--spring jdbc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>6.1.4</version>
        </dependency>
        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.15</version>
        </dependency>
        <!--mybatis spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>3.0.3</version>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <version>8.3.0</version>
        </dependency>
        <!--德鲁伊连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.22</version>
        </dependency>
        <!--jackson-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.17.0</version>
        </dependency>
        <!--servlet api-->
        <dependency>
            <groupId>jakarta.servlet</groupId>
            <artifactId>jakarta.servlet-api</artifactId>
            <version>6.0.0</version>
            <scope>provided</scope>
        </dependency>
        <!--logback-->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.5.3</version>
        </dependency>
        <!--thymeleaf和spring6的整合依赖-->
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring6</artifactId>
            <version>3.1.2.RELEASE</version>
        </dependency>
    </dependencies>

1.web.xml文件的替代

        Servlet3.0新特性：服务器在启动的时候会自动从容器中找 ServletContainerInitializer接口的实现类，自动调用它的onStartup方法来完成Servlet上下文的初始化

        spring3.1版本后，类继承AbstractAnnotationConfigDispatcherServletInitializer之后，web服务器在启动的时候会根据它来初始化Servlet上下文

        代替web.xml文件的类

public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
    /**
     * Spring的配置
     * @return
     */
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }

    /**
     * SpringMVC的配置
     * @return
     */
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMVCConfig.class};
    }

    /**
     * 用于配置 DispatcherServlet 的映射路径
     * @return
     */
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }

    /**
     * 配置过滤器
     * @return
     */
    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
        characterEncodingFilter.setEncoding("UTF-8");
        characterEncodingFilter.setForceRequestEncoding(true);
        characterEncodingFilter.setForceResponseEncoding(true);
        HiddenHttpMethodFilter hiddenHttpMethodFilter = new HiddenHttpMethodFilter();
        return new Filter[]{characterEncodingFilter, hiddenHttpMethodFilter};
    }
}

2.Spring整合MyBatis     

     2.1.编写jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/数据库?useUnicode=true&serverTimezone=Asia/Shanghai&useSSL=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=123

     2.2.编写DataSourceConfig

public class DataSourceConfig {

    @Value("${jdbc.driver}")
    private String driver;

    @Value("${jdbc.url}")
    private String url;

    @Value("${jdbc.username}")
    private String username;

    @Value("${jdbc.password}")
    private String password;

    @Bean
    public DataSource dataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }
}

     2.3.整合MyBatisConfig

public class MyBatisConfig {

    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource);
        sqlSessionFactoryBean.setTypeAliasesPackage("ssm.bean");
        return sqlSessionFactoryBean;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("ssm.dao");
        return msc;
    }

}

     2.4.整合SpringConfig

@Configuration
@ComponentScan({"ssm.service"})
@PropertySource("classpath:jdbc.properties")
@Import({DataSourceConfig.class, MyBatisConfig.class})
public class SpringConfig {
}

3.Spring整合Spring MVC

@Configuration
@ComponentScan("ssm.handler")
@EnableWebMvc
public class SpringMvcConfig implements WebMvcConfigurer {

    // 以下三个方法合并起来就是开启视图解析器
    @Bean
    public ThymeleafViewResolver getViewResolver(SpringTemplateEngine springTemplateEngine) {
        ThymeleafViewResolver resolver = new ThymeleafViewResolver();
        resolver.setTemplateEngine(springTemplateEngine);
        resolver.setCharacterEncoding("UTF-8");
        resolver.setOrder(1);
        return resolver;
    }

    @Bean
    public SpringTemplateEngine templateEngine(ITemplateResolver iTemplateResolver) {
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(iTemplateResolver);
        return templateEngine;
    }

    @Bean
    public ITemplateResolver templateResolver(ApplicationContext applicationContext) {
        SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
        resolver.setApplicationContext(applicationContext);
        resolver.setPrefix("/WEB-INF/thymeleaf/");
        resolver.setSuffix(".html");
        resolver.setTemplateMode(TemplateMode.HTML);
        resolver.setCharacterEncoding("UTF-8");
        resolver.setCacheable(false);//开发时关闭缓存，改动即可生效
        return resolver;
    }

    // 开启静态资源处理，开启默认的Servlet处理
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    // 视图控制器
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {}
    // 配置异常处理器
    @Override
    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {}

    // 配置拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {}
}

4.开启事务

//在SpringConfig中开启事务管理器
@EnableTransactionManagement
public class SpringConfig {
}

//在DataSourceConfig中添加事务管理器对象
@Bean
public PlatformTransactionManager platformTransactionManager(DataSource dataSource){
    DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();
    dataSourceTransactionManager.setDataSource(dataSource);
    return dataSourceTransactionManager;
}

//在service类上添加注解
@Transactional
public class UserService {}