spring4.x以後,實現了零配置.其實就是把相關的配置檔案變成了配置類.以前的application.xml變成了

@Configuration @EnableWebMvc @ComponentScan("com.youxiduo.annotation") public class AnnoConfig { } @Configuration 宣告這個類是配置類

@ComponentScan 對所有component(元件)的掃描,載入

@EnableWebMvc 開啟對webMvc的支援

上面只是spring容器的配置類,那麼如何接受到前臺的請求呢,這個就要實現spring對web.xml的實現

public class WebInitializer implements WebApplicationInitializer { @Override public void onStartup(ServletContext servletContext) throws ServletException { AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext(); ctx.register(AnnoConfig.class); ctx.setServletContext(servletContext);//新建WebApplicationContext,註冊配置類,並將其和當前的servletContext關聯 //註冊sprigmvc的DispatcherServlet ServletRegistration.Dynamic servlet = servletContext.addServlet("dispatcher",new DispatcherServlet(ctx)); servlet.addMapping("/"); servlet.setLoadOnStartup(1); } } WebApplicationInitializer 是spring提供用來配置Servlet3.0+配置介面,從而實現了替代web.xml的位置.實現介面將自動被SpringServletContainerInitializer（用來獲取Servlet3.0容器的）獲取到.

需要用到的兩個jar檔案

<dependency> <groupId>javax</groupId> <artifactId>javaee-web-api</artifactId> <version>7.0</version> <scope>provided</scope> </dependency> <!--Spring MVC --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.4.RELEASE</version> </dependency>