使用配置类和注解代替web.xml和SpringMVC配置文件的功能
1、创建初始化类，代替web.xml
在Servlet3.0环境中，容器会在类路径中查找实现javax.servlet.ServletContainerInitializer接口的类，如果找到的话就用它来配置Servlet容器。 Spring提供了这个接口的实现，名为SpringServletContainerInitializer，这个类反过来又会查找实现WebApplicationInitializer的类并将配置的任务交给它们来完成。Spring3.2引入了一个便利的WebApplicationInitializer基础实现，名为AbstractAnnotationConfigDispatcherServletInitializer，当我们的类扩展了AbstractAnnotationConfigDispatcherServletInitializer并将其部署到Servlet3.0容器的时候，容器会自动发现它，并用它来配置Servlet上下文。
public class WebInit extends AbstractAnnotationConfigDispatcherServletInitializer { /** * 指定spring的配置类 * @return */ @Override protected Class<?>[] getRootConfigClasses() { return new Class[]{SpringConfig.class}; } /** * 指定SpringMVC的配置类 * @return */ @Override protected Class<?>[] getServletConfigClasses() { return new Class[]{WebConfig.class}; } /** * 指定DispatcherServlet的映射规则，即url-pattern * @return */ @Override protected String[] getServletMappings() { return new String[]{"/"}; } /** * 添加过滤器 * @return */ @Override protected Filter[] getServletFilters() { CharacterEncodingFilter encodingFilter = new CharacterEncodingFilter(); encodingFilter.setEncoding("UTF-8"); encodingFilter.setForceRequestEncoding(true); HiddenHttpMethodFilter hiddenHttpMethodFilter = new HiddenHttpMethodFilter(); return new Filter[]{encodingFilter, hiddenHttpMethodFilter}; } }
2、创建SpringConfig配置类，代替spring的配置文件
1. @Configuration 2. public class SpringConfig { 3. //ssm整合之后，spring的配置信息写在此类中 4. }
3、创建WebConfig配置类，代替SpringMVC的配置文件
@Configuration //扫描组件 @ComponentScan("com.atguigu.mvc.controller") //开启MVC注解驱动 @EnableWebMvc public class WebConfig implements WebMvcConfigurer { //使用默认的servlet处理静态资源 @Override public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) { configurer.enable(); } //配置文件上传解析器 @Bean public CommonsMultipartResolver multipartResolver(){ return new CommonsMultipartResolver(); } //配置拦截器 @Override public void addInterceptors(InterceptorRegistry registry) { FirstInterceptor firstInterceptor = new FirstInterceptor(); registry.addInterceptor(firstInterceptor).addPathPatterns("/**"); } //配置视图控制 /*@Override public void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/").setViewName("index"); }*/ //配置异常映射 /*@Override public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) { SimpleMappingExceptionResolver exceptionResolver = new SimpleMappingExceptionResolver(); Properties prop = new Properties(); prop.setProperty("java.lang.ArithmeticException", "error"); //设置异常映射 exceptionResolver.setExceptionMappings(prop); //设置共享异常信息的键 exceptionResolver.setExceptionAttribute("ex"); resolvers.add(exceptionResolver); }*/ //配置生成模板解析器 @Bean public ITemplateResolver templateResolver() { WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext(); // ServletContextTemplateResolver需要一个ServletContext作为构造参数，可通过WebApplicationContext 的方法获得 ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver( webApplicationContext.getServletContext()); templateResolver.setPrefix("/WEB-INF/templates/"); templateResolver.setSuffix(".html"); templateResolver.setCharacterEncoding("UTF-8"); templateResolver.setTemplateMode(TemplateMode.HTML); return templateResolver; } //生成模板引擎并为模板引擎注入模板解析器 @Bean public SpringTemplateEngine templateEngine(ITemplateResolver templateResolver) { SpringTemplateEngine templateEngine = new SpringTemplateEngine(); templateEngine.setTemplateResolver(templateResolver); return templateEngine; } //生成视图解析器并未解析器注入模板引擎 @Bean public ViewResolver viewResolver(SpringTemplateEngine templateEngine) { ThymeleafViewResolver viewResolver = new ThymeleafViewResolver(); viewResolver.setCharacterEncoding("UTF-8"); viewResolver.setTemplateEngine(templateEngine); return viewResolver; } }
4、测试功能
1. @RequestMapping("/") 2. public String index(){ 3. return "index"; 4. }
