SpringBoot实现拦截器

SpringBoot使用Servlet

项目依赖：

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>

通过注解MyServlet 并继承HttpServlet重写它的方法.

@WebServlet(urlPatterns = "/myServlet")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("myServlet");
        resp.getWriter().write("myServlet to page");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

最后需要在启动类扫描Servlet所在包。

@SpringBootApplication
@ServletComponentScan(basePackages = "com.jiuyue.servlet")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

另一种方式

public class HeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("heServlet");
        resp.getWriter().write("heServlet to page");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

使用@Configuration注解配置类，相当于xml文件中配置了Servlet。在配置类中使用@Bean注解注册Servlet.

@Configuration
public class ServletConfig {
    @Bean
    public ServletRegistrationBean ServletRegistrationBean(){
        ServletRegistrationBean registration =
                new ServletRegistrationBean(new HeServlet(),"/heServlet");
        return registration;
    }
}