SpringBoot系列教程web篇Servlet 注册的四种姿势
在Spring Boot中,可以通过以下四种方式注册Servlet:
- 继承SpringBootServletInitializer类
- 使用ServletRegistrationBean注册
- 使用ServletComponentRegister注册
- 使用@WebServlet注解注册
下面是这四种方式的示例代码:
- 继承SpringBootServletInitializer类
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("Hello, world");
}
}
public class ServletInitializer extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(ServletInitializer.class);
}
@Bean
public ServletRegistrationBean myServlet() {
return new ServletRegistrationBean(new MyServlet(), "/myServlet");
}
}
- 使用ServletRegistrationBean注册
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("Hello, world");
}
}
@Configuration
public class ServletConfig {
@Bean
public ServletRegistrationBean myServlet() {
return new ServletRegistrationBean(new MyServlet(), "/myServlet");
}
}
- 使用@WebServlet注解注册
@WebServlet(name = "myServlet", urlPatterns = "/myServlet")
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("Hello, world");
}
}
- 使用ServletComponentRegister注册
@WebServlet(name = "myServlet", urlPatterns = "/myServlet")
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("Hello, world");
}
}
@Configuration
public class ServletConfig implements WebServletRegistry {
@Override
public void registerServlet(ServletRegistrationBean servletRegistrationBean) {
servletRegistrationBean.setServlet(new MyServlet());
servletRegistrationBean.addUrlMappings("/myServlet");
}
}
以上四种方式均可以在Spring Boot应用中注册Servlet,具体使用哪一种取决于具体的应用场景和需求。
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