一、介绍
利用配置类和注解来代替web.xml和SpringMVC-config.xml文件
二、项目测试
(1)创建继承了AbstractAnnotationConfigDispatcherServletInitializer的类,该类可以配置DispatcherServlet、过滤器、监听器、Spring配置类、SpringMVC配置类。
public class WebInit extends AbstractAnnotationConfigDispatcherServletInitializer {
//指定Spring的配置类
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[]{SpringConfig.class};
}
//指定SpringMVC的配置类
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[]{WebConfig.class};
}
//指定DispatcherServlet的映射规则
@Override
protected String[] getServletMappings() {
return new String[]{"/"};
}
//配置过滤器
@Override
protected Filter[] getServletFilters() {
CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
characterEncodingFilter.setEncoding("UTF-8");
characterEncodingFilter.setForceResponseEncoding(true);
HiddenHttpMethodFilter hiddenHttpMethodFilter = new HiddenHttpMethodFilter();
hiddenHttpMethodFilter.setMethodParam("_method");
return new Filter[]{characterEncodingFilter, hiddenHttpMethodFilter};
}
}
(2)创建SpringConfig类,用于整合其他框架使用
@Configuration
public class SpringConfig {
}
(3)创建WebConfig类,作为SpringMVC的配置类,用于开启组件扫描,配置视图解析器Bean。该类实现WebMvcConfigurer接口后,可以配置注解驱动、静态资源处理(DefaultServlet)、视图控制器、拦截器、异常处理器
@Configuration
@ComponentScan("com.wsh.controller")
@EnableWebMvc //开启注解驱动
public class WebConfig implements WebMvcConfigurer {
//模板解析器
@Bean
public ITemplateResolver templateResolver(){
WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();
ServletContextTemplateResolver templateResolver =
new ServletContextTemplateResolver(webApplicationContext.getServletContext());
templateResolver.setPrefix("WEB-INF/templates/");
templateResolver.setSuffix(".html");
templateResolver.setCharacterEncoding("UTF-8");
templateResolver.setTemplateMode(TemplateMode.HTML);
return templateResolver;
}
//将模板解析器注入模板引擎
@Bean
public SpringTemplateEngine templateEngine(ITemplateResolver templateResolver){
SpringTemplateEngine templateEngine = new SpringTemplateEngine();
templateEngine.setTemplateResolver(templateResolver);
return templateEngine;
}
//将模板引擎注入Thymeleaf视图解析器
@Bean
public ViewResolver viewResolver(SpringTemplateEngine templateEngine){
ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
viewResolver.setTemplateEngine(templateEngine);
viewResolver.setCharacterEncoding("UTF-8");
return viewResolver;
}
//开启DefaultServlet来处理静态资源
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
//添加拦截器
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new FirstInterceptor()).addPathPatterns("/**");
registry.addInterceptor(new SecondInterceptor()).addPathPatterns("/**");
}
//添加视图控制器
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/hello").setViewName("forward:index");
}
//添加异常处理器
@Override
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
SimpleMappingExceptionResolver exceptionResolver = new SimpleMappingExceptionResolver();
Properties properties = new Properties();
properties.setProperty("java.lang.ArithmeticException", "forward:error");
exceptionResolver.setExceptionMappings(properties);
exceptionResolver.setExceptionAttribute("ex");
resolvers.add(exceptionResolver);
}
}