[英]How can I register a secondary servlet with Spring Boot?
我需要在我的應用程序中注冊一個額外的servlet。 但是使用Spring Boot及其Java Config,我不能只在web.xml
文件中添加servlet映射。
如何添加其他servlet?
另外還有ServletRegistrationBean
@Bean
public ServletRegistrationBean servletRegistrationBean(){
return new ServletRegistrationBean(new FooServlet(),"/someOtherUrl/*");
}
最終成為我走的路。
只需為servlet添加一個bean 。 它將被映射到/{beanName}/
。
@Bean
public Servlet foo() {
return new FooServlet();
}
您可以在Application類中使用不同的ServletRegistrationBean注冊多個不同的servlet,如@Bean,並且可以注冊一個具有多個servlet映射的servlet;
@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");
}
我們也可以按照以下方式注冊Servlet:
@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);
}
}
如果您使用的是嵌入式服務器,則可以使用@WebServlet
注釋您的servlet類:
@WebServlet(urlPatterns = "/example")
public class ExampleServlet extends HttpServlet
來自@WebServlet :
用於聲明servlet的注釋。
該注釋在部署時由容器處理,並且相應的servlet在指定的URL模式下可用。
並在基類上啟用@ServletComponentScan
:
@ServletComponentScan
@EntityScan(basePackageClasses = { ExampleApp.class, Jsr310JpaConverters.class })
@SpringBootApplication
public class ExampleApp
請注意, @ ServletComponentScan僅適用於嵌入式服務器:
允許掃描Servlet組件(過濾器,servlet和偵聽器)。 僅在使用嵌入式Web服務器時執行掃描。
也可以在BeanDefinitionRegistryPostProcessor中使用
package bj;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@SpringBootApplication
class App implements BeanDefinitionRegistryPostProcessor {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
registry.registerBeanDefinition("myServlet", new RootBeanDefinition(ServletRegistrationBean.class,
() -> new ServletRegistrationBean<>(new HttpServlet() {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws IOException {
resp.getWriter().write("hello world");
}
}, "/foo/*")));
}
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
}
}
這種方式對我有用,有一個名為WS01455501EndpointFor89的servlet
@Bean
public ServletRegistrationBean<WS01455501EndpointFor89> servletRegistrationBeanAlt(ApplicationContext context) {
ServletRegistrationBean<WS01455501EndpointFor89> servletRegistrationBean = new ServletRegistrationBean<>(new WS01455501EndpointFor89(),
"/WS01455501Endpoint");
servletRegistrationBean.setLoadOnStartup(1);
return servletRegistrationBean;
}
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