注解配置SpringMVC

注解配置SpringMVC

在Servlet3.0环境中，容器会在类路径中查找实现了javax.servlet.ServletContrainerInitializer接口的类，如果找到，用它来配置Servlet容器

Spring中提供了这个接口的实现，SpringServletContainerInitializer，这个类会查找实现了WebApplicationInitializer的类并将配置任务给他们来完成

Spring中有WebApplicationInitializer的基础实现AbstractAnnotationConfigDispatcherServletInitializer，当有类扩展了他并配置到了Servlet容器中，容器会自动发现并用它来配置上下文

• 服务器配置

package com.example.config;

import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.filter.HiddenHttpMethodFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import javax.servlet.Filter;

public class WebInit extends AbstractAnnotationConfigDispatcherServletInitializer
{
    //配置Spring容器
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }
    //配置SpringMVC容器
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{WebConfig.class};
    }
    //配置DispatcherServlet的映射路径
    @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.setForceEncoding(true);
        HiddenHttpMethodFilter hiddenHttpMethodFilter = new HiddenHttpMethodFilter();

        return new Filter[]{characterEncodingFilter,hiddenHttpMethodFilter};
    }
}

• SpringMVC配置

@Configuration
@ComponentScan(basePackages = "com.example.controller") //扫描组件
@EnableWebMvc //开启SpringMVC注解驱动
public class WebConfig implements WebMvcConfigurer {
    //默认的Servlet,来处理静态资源
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
    //视图控制器
     public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
     }
     //文件上传解析器--bean
    @Bean   //将方法的返回值注入到Spring容器中，bean的名称为方法名
    public MultipartResolver multipartResolver(){
        return new CommonsMultipartResolver();
    }
    //拦截器


    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/test");

    }
    //异常解析器
    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
        SimpleMappingExceptionResolver resolver = new SimpleMappingExceptionResolver();
        Properties prop = new Properties();
        //参数一：异常类型，参数二：视图名称
        prop.setProperty("java.lang.ArithmeticException","error");
        resolver.setExceptionMappings(prop);
        // 异常信息属性名，共享到请求域中
        resolver.setExceptionAttribute("ex");
        resolvers.add(resolver);
    }

    //视图解析器
    //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;
    }
}

• Spring配置,略