一、注解方式

1.1 使用Servlet3注解方式写一个Servlet

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@WebServlet(urlPatterns = "/testServlet",initParams = {
        @WebInitParam(name="name",value="wno704")
})
public class TestServlet extends HttpServlet {
    private static final long serialVersionUID = -4316351735748478174L;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String name = req.getParameter("name");
        resp.getWriter().println("he " + name + " hello world");
        resp.getWriter().flush();
        resp.getWriter().close();
    }

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

1.2 在启动类添加注解扫描servlet

@ServletComponentScan(basePackages = "com.wno704.boot.servlet")

1.3 测试

启动项目,访问 http://localhost:8080/testServlet?name=wno7042

二、通过SpringBoot配置类实现

2.1 编写一个普通servlet类

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public class HeServlet extends HttpServlet {
    private static final long serialVersionUID = -4316351735748478173L;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().println("he servlet hello world");
        resp.getWriter().flush();
        resp.getWriter().close();
    }

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

2.2 编写一个springboot配置类

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

2.3 测试

启动项目，访问 http://localhost:8080/heServlet

三、动态注册

3.1 编写一个普通的Servlet类

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public class HeServlet extends HttpServlet {
    private static final long serialVersionUID = -4316351735748478173L;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().println("he servlet hello world");
        resp.getWriter().flush();
        resp.getWriter().close();
    }

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

3.2编写一个Servlet注册类

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@Component
public class ServletConfig implements ServletContextInitializer {
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        ServletRegistration iniServlet = servletContext.addServlet("iniServlet", HeServlet.class);
        iniServlet.addMapping("/iniServlet");
        //iniServlet.setInitParameter("name","wno704");

    }
}

3.3 测试

启动项目，访问 http://localhost:8080/iniServlet