搭建SSM框架（配置类形式）

1、先导入需要用的jar包

<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>6.1.11</version>
</dependency>

<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.16</version>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>6.1.11</version>
</dependency>

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.23</version>
</dependency>

<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.34</version>
</dependency>

<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>6.1.0</version>
</dependency>

<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.17.2</version>
</dependency>

<dependency>
<groupId>jakarta.servlet</groupId>
<artifactId>jakarta.servlet-api</artifactId>
<version>6.0.0</version>
</dependency>

<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>3.0.3</version>
</dependency>

<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.8.27</version>
</dependency>
</dependencies>

2、创建配置类

2.1、我的配置类包名

2.2、AppConfig类

@Configuration
@ComponentScan("com.cxd")
@Import({SpringConfig.class, WebMvcConfig.class, MybatisConfig.class})
public class AppConfig {

}

2.3、MybatisConfig类

public class MybatisConfig {
    @Bean
    public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource) {
        System.out.println("data:"+dataSource);
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource);
        //mybatis配置文件
        Configuration configuration=new Configuration();
        configuration.setLogImpl(StdOutImpl.class);
        configuration.setMapUnderscoreToCamelCase(true);
        factoryBean.setConfiguration(configuration);
        factoryBean.setPlugins(new PageInterceptor());
        return factoryBean;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer mapperScannerConfigurer=new MapperScannerConfigurer();
        mapperScannerConfigurer.setBasePackage("com.cxd.mapper");
        return mapperScannerConfigurer;
    }
}

2.4、MyWebApplicationInit类

public class MyWebApplicationInit implements WebApplicationInitializer {
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        //关联AppConfig配置类
        AnnotationConfigWebApplicationContext context =
        new AnnotationConfigWebApplicationContext();
        context.register(AppConfig.class);
        //前端控制器
        DispatcherServlet dispatcherServlet = new DispatcherServlet(context);
        //添加前端控制器到web容器
        ServletRegistration.Dynamic dynamic =
        servletContext.addServlet("spring-servlet", dispatcherServlet);
        //设置该servlet启动时机 （web容器启动时，实列化servlet）
        dynamic.setLoadOnStartup(1);
        //设置servlet的匹配路径
        dynamic.addMapping("/");

        //添加编码过滤器
        servletContext.addFilter("encodingFilter", new CharacterEncodingFilter("UTF-8"));

        MultipartConfigElement configElement =
        new MultipartConfigElement("", 1024 * 1024, 1024 * 1024, 0);
        dynamic.setMultipartConfig(configElement);

    }
}

2.5、SpringConfig类

@PropertySource(value = "classpath:mysql.properties")
@EnableTransactionManagement
public class SpringConfig {

    @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() {
        System.out.println("driver"+driver);
        DriverManagerDataSource dataSource =
        new DriverManagerDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }

    @Bean
    public TransactionManager transactionManager(DataSource dataSource) {
        DataSourceTransactionManager transactionManager = new DataSourceTransactionManager();
        transactionManager.setDataSource(dataSource);
        return transactionManager;
    }
}

2.6、WebMvcConfig类

@EnableWebMvc
public class WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    //拦截器
    public void addInterceptors(InterceptorRegistry registry) {
        //        registry.addInterceptor(new LoginInterceptor())
        //                .addPathPatterns("/**")
        //                .excludePathPatterns("/","/user/login","/user/getCode");
    }


    //        文件解析器
    @Bean
    public MultipartResolver multipartResolver() {
        StandardServletMultipartResolver multipartResolver =
        new StandardServletMultipartResolver();
        return multipartResolver;
    }


    //视图控制，默认首页
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("login");

    }

    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver =
        new InternalResourceViewResolver();
        viewResolver.setPrefix("/WEB-INF/page/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }
}

3、mysql.properties文件

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/xxx
jdbc.username=xxx
jdbc.password=xxx