maven的java web工程改造为springboot项目

更改资源文件的位置

把webapp目录下的文件拷贝到resources目录的static目录下

迁移web.

• 扩展WebApplicationInitializer迁移web.

• public class WebInitializer implements WebApplicationInitializer {
  
      @Override
      public void  up(ServletContext servletContext)
              throws ServletException {
          AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
          ctx.register(MyMvcConfig.class);
          ctx.setServletContext(servletContext); 
          
          Dynamic servlet = servletContext.addServlet(\"dispatcher\", new DispatcherServlet(ctx)); 
          servlet.addMapping(\"/\");
          servlet.setLoad up(1);
          servlet.setAsyncSupported(true);
  
      }
  
  }

  WebApplicationInitializer的实现类会自动被SpringServletContainerInitializer(用来启动servlet3.0容器)获取到。

  EnableWebMvc

  开启该注解，会开启一些mvc的默认配置:

• 必要的ViewResolver，比如ContentNegoti-atingViewResolver和Bean-NameViewRe-solver。

• 将必要的Converter、GenericConverter和Formatter等bean注册到IoC容器。 - 添加一系列的HttpMessageConverter以便支持对Web请求和相应的类型转换。

• 自动配置和注册MessageCodesResolver。

• 但如果使用下面的方式则会覆盖默认的配置(spring-boot-starter-web该依赖会autoconfig这些)。

• 自定义webmvc

  可以通过Configuration、EnableWebMvc注解在继承WebMvcConfigurerAdapter的类上面，来自定义mvc的配置

• @Configuration
  @EnableWebMvc// 1
  @EnableScheduling
  @ComponentScan(\"com.wisely.highlight_springmvc4\")
  public class MyMvcConfig extends WebMvcConfigurerAdapter {// 2
  
      @Bean
      public InternalResourceViewResolver viewResolver() {
          InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
          viewResolver.setPrefix(\"/WEB-INF/classes/views/\");
          viewResolver.setSuffix(\".jsp\");
          viewResolver.setViewClass(JstlView.class);
          return viewResolver;
      }
  
      @Override
      public void addResourceHandlers(ResourceHandlerRegistry registry) {
  
          registry.addResourceHandler(\"/assets/**\").addResourceLocations(
                  \"classpath:/assets/\");// 3
  
      }
  
      @Bean
      // 1
      public DemoInterceptor demoInterceptor() {
          return new DemoInterceptor();
      }
  
      @Override
      public void addInterceptors(InterceptorRegistry registry) {// 2
          registry.addInterceptor(demoInterceptor());
      }
  
      @Override
      public void addViewControllers(ViewControllerRegistry registry) {
          registry.addViewController(\"/index\").setViewName(\"/index\");
          registry.addViewController(\"/toUpload\").setViewName(\"/upload\");
          registry.addViewController(\"/converter\").setViewName(\"/converter\");
          registry.addViewController(\"/sse\").setViewName(\"/sse\");
          registry.addViewController(\"/async\").setViewName(\"/async\");
      }
  
       @Override
       public void configurePathMatch(PathMatchConfigurer configurer) {
       configurer.setUseSuffixPatternMatch(false);
       }
  
      @Bean
      public MultipartResolver multipartResolver() {
          CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
          multipartResolver.setMaxUploadSize(1000000);
          return multipartResolver;
      }
      
      @Override
      public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
          converters.add(converter());
      }
      
      @Bean 
      public MyMessageConverter converter(){
          return new MyMessageConverter();
      }
  }