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.xml

• 扩展WebApplicationInitializer迁移web.xml

public class WebInitializer implements WebApplicationInitializer {//1

    @Override
    public void onStartup(ServletContext servletContext)
            throws ServletException {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(MyMvcConfig.class);
        ctx.setServletContext(servletContext); //2
        
        Dynamic servlet = servletContext.addServlet("dispatcher", new DispatcherServlet(ctx)); //3
        servlet.addMapping("/");
        servlet.setLoadOnStartup(1);
        servlet.setAsyncSupported(true);//1

    }

}

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> converters) {
        converters.add(converter());
    }
    
    @Bean 
    public MyMessageConverter converter(){
        return new MyMessageConverter();
    }
}