2、application类

@SpringBootApplication
@ServletComponentScan
public class SpringBootApplication extends SpringBootServletInitializer {private static final Logger logger = LoggerFactory.getLogger(SpringBootSampleApplication.class);public static void main(String[] args) {SpringApplication.run(SpringBootSampleApplication.class, args);}
}
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3、配置类

@Repository
@Component
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter implements EnvironmentAware{private static final Logger logger = LoggerFactory.getLogger(MyWebAppConfigurer.class);private RelaxedPropertyResolver propertyResolver;@Overridepublic void addInterceptors(InterceptorRegistry registry) {// 多个拦截器组成一个拦截器链// addPathPatterns 用于添加拦截规则// excludePathPatterns 用户排除拦截registry.addInterceptor(new MyInterceptor1()).addPathPatterns("/**");registry.addInterceptor(new MyInterceptor2()).addPathPatterns("/**");super.addInterceptors(registry);}@Overridepublic void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("/res/**").addResourceLocations("classpath:/res/");// 可以直接使用addResourceLocations 指定磁盘绝对路径，同样可以配置多个位置，注意路径写法需要加上file:registry.addResourceHandler("/imgs/**").addResourceLocations("file:D:/imgs/");super.addResourceHandlers(registry);}
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4、添加filter

@WebFilter(filterName="myFilter",urlPatterns="/*")
public class MyFilter implements Filter {@Overridepublic void destroy() {System.out.println("过滤器销毁");}@Overridepublic void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {System.out.println("执行过滤操作");   chain.doFilter(request, response);}@Overridepublic void init(FilterConfig config) throws ServletException {System.out.println("过滤器初始化");}
}
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5、controller

@RestController
@RequestMapping("/hello")
public class HelloController {@RequestMapping("/info")public Map<String, String> getInfo(@RequestParam String name) {Map<String, String> map = new HashMap<>();return map;}
}
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6、service

@Service
public class HelloWorldService {public String getHelloMessage() {return "Hello world";}
}
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7、全局异常处理

@ControllerAdvicepublic class GlobalExceptionHandler {@ExceptionHandler(RuntimeException.class)@ResponseBody //在返回自定义相应类的情况下必须有，这是@ControllerAdvice注解的规定public MyExceptionResponse exceptionHandler(RuntimeException e, HttpServletResponse response) {return resp;}}
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说明：

@Bean
public PageHelper pageHelper(DataSource dataSource) {PageHelper pageHelper = new PageHelper();return pageHelper;
}
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@Component
public class MyStartupRun implements CommandLineRunner {@Overridepublic void run(String... args) throws Exception {System.out.println(">>>>>>>>>>>>>>>服务启动执行");}
}
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该组件在项目启动时会立即执行

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