为Spring boot项目增加Servlet

为Spring boot项目增加Servlet有好多种方式

方式1

Just add a bean for the servlet. It'll get mapped to /{beanName}/.

@Bean
public Servlet foo() {
    return new FooServlet();
}

Note that if you actually want it mapped to /something/* rather than /something/ you will need to use ServletRegistrationBean

方式2

使用ServletRegistrationBean

@Bean
public ServletRegistrationBean servletRegistrationBean(){
    return new ServletRegistrationBean(new FooServlet(),"/someOtherUrl/*");
}

如果想增加多个的话，就类似下面的方式

 @Bean
   public ServletRegistrationBean axisServletRegistrationBean() {
      ServletRegistrationBean registration = new ServletRegistrationBean(new AxisServlet(), "/services/*");
      registration.addUrlMappings("*.jws");
      return registration;
   }

   @Bean
   public ServletRegistrationBean adminServletRegistrationBean() {
      return new ServletRegistrationBean(new AdminServlet(), "/servlet/AdminServlet");
   }

方式3

通过实现WebApplicationInitializer或者ServletContextInitializer或者ServletContainerInitializer接口

@Configuration
public class ConfigureWeb implements ServletContextInitializer, EmbeddedServletContainerCustomizer {

  @Override
  public void onStartup(ServletContext servletContext) throws ServletException {
      registerServlet(servletContext);
  }

  private void registerServlet(ServletContext servletContext) {
      log.debug("register Servlet");
      ServletRegistration.Dynamic serviceServlet = servletContext.addServlet("ServiceConnect", new ServiceServlet());

      serviceServlet.addMapping("/api/ServiceConnect/*");
      serviceServlet.setAsyncSupported(true);
      serviceServlet.setLoadOnStartup(2);
  }
}

方式4

如果使用内嵌的server的话，那么还可以使用@WebServlet WebServlet

Annotation used to declare a servlet.

This annotation is processed by the container at deployment time, and the corresponding servlet made available at the specified URL patterns.

@WebServlet(urlPatterns = "/example")
public class ExampleServlet extends HttpServlet

然后增加注解@ServletComponentScan:

@ServletComponentScan
@EntityScan(basePackageClasses = { ExampleApp.class, Jsr310JpaConverters.class })
@SpringBootApplication
public class ExampleApp 

Please note that @ServletComponentScan will work only with embedded server:

Enables scanning for Servlet components (filters, servlets, and listeners). Scanning is only performed when using an embedded web server.

参考资料

• How can I register a secondary servlet with Spring Boot?
• The @ServletComponentScan Annotation in Spring Boot

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