Spring Boot基础-web应用开发-Servlets, Filters, listeners

芝麻绿豆 发布于 2016/10/11 17:12
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更多参考博文:http://www.roncoo.com/article/index

Web开发使用 Controller 基本上可以完成大部分需求,但是我们还可能会用到 Servlet、 Filter、Listener等等

 

二.在spring boot中的三种实现方式

  方法一:通过注册ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制

 

/**

 * 自定义servlet

 *

 * @author wujing

 */

public class CustomServlet extends HttpServlet {

 

  /**

   *

   */

  private static final long serialVersionUID = 1L;

 

  @Override

  protected void doGet(HttpServletRequest request, HttpServletResponse response)

         throws ServletException, IOException {

    System.out.println("servlet get method");

    doPost(request, response);

  }

 

  @Override

  protected void doPost(HttpServletRequest request, HttpServletResponse response)

         throws ServletException, IOException {

    System.out.println("servlet post method");

    response.getWriter().write("hello world");

  }

 

}

 

/**

 * 自定义filter

 *

 * @author wujing

 */

public class CustomFilter implements Filter {

 

  @Override

  public void init(FilterConfig filterConfig) throws ServletException {

    System.out.println("init filter");

  }

 

  @Override

  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

         throws IOException, ServletException {

    System.out.println("do filter");

    chain.doFilter(request, response);

  }

 

  @Override

  public void destroy() {

    System.out.println("destroy filter");

  }

 

}

 

/**

 * 自定义listener

 *

 * @author wujing

 */

public class CustomListener implements ServletContextListener {

 

  @Override

  public void contextInitialized(ServletContextEvent sce) {

    System.out.println("contextInitialized");

  }

 

  @Override

  public void contextDestroyed(ServletContextEvent sce) {

    System.out.println("contextDestroyed");

  }

 

}

 

注册bean

 

@Bean

  public ServletRegistrationBean servletRegistrationBean() {

    return new ServletRegistrationBean(new CustomServlet(), "/roncoo");

  }

 

  @Bean

  public FilterRegistrationBean filterRegistrationBean() {

    return new FilterRegistrationBean(new CustomFilter(), servletRegistrationBean());

  }

 

  @Bean

  public ServletListenerRegistrationBean<CustomListener> servletListenerRegistrationBean() {

    return new ServletListenerRegistrationBean<CustomListener>(new CustomListener());

  }

 

  方法二:通过实现 ServletContextInitializer 接口直接注册

 

implements ServletContextInitializer {

 

   @Override

   public void onStartup(ServletContext servletContextthrows ServletException {

      servletContext.addServlet("customServlet"newCustomServlet()).addMapping("/roncoo");

      servletContext.addFilter("customFilter"new CustomFilter())

            .addMappingForServletNames(EnumSet.of(DispatcherType.REQUEST), true,"customServlet");

      servletContext.addListener(new CustomListener());

  }

 

  方法三:在 SpringBootApplication 上使用@ServletComponentScan 注解后,直接通过@WebServlet、@WebFilter、@WebListener 注解自动注册


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写成博客吧,写的好,还会有人打赏,
芝麻绿豆
芝麻绿豆
博客也在同步更新的
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