SpringBoot实战之7 注册自定义Servlet

男娘i 2022-06-04 04:23 127阅读 0赞

## 应用场景 ##

在以前的web项目，servlet常用与特殊处理，比如验证码的实现，对外暴露http接口等等，重要性不言而喻。

springboot也有自己的实现servlet的方式。

*  代码注册servlet
    
    通过ServletRegistrationBean、FilterRegistrationBean、ServletListenerRegistrationBean、ServletContextInitializer
    
    案例采用通过ServletRegistrationBean注册实现
 *  注解注册servlet
    
    比较方便，首先再SpringBootApplication（springboot项目入口）上添加@ServletComponentScan注解，其次，是自定义Servlet上添加@WebServlet注解

## 一、代码注册实现 ##

自定义servlet MyServlet.java

// 方法二：通过@WebServlet
    //@WebServlet(urlPatterns = "/myServlet.view",description = "这事我自定义的servlet")
    public class MyServlet extends HttpServlet { 
        private final Logger _logger = LoggerFactory.getLogger(this.getClass());
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            _logger.info("===========doGet()============");
            doPost(req, resp);
        }
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            _logger.info("===========doPost()============");
            resp.setCharacterEncoding("utf-8");
            resp.setContentType("text/html");
            PrintWriter out = resp.getWriter();
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Hello World</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>这是我自定义的Servlet</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

自定义配置文件

@Configuration
    public class ServertConfig { 
        /** * 方法一：通过ServletRegistrationBean注册 * @return */
        @Bean
        public ServletRegistrationBean servletRegistrationBean(){
            return new ServletRegistrationBean(new MyServlet(),"/myServlet/*") ;
        }
    }

程序入口

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

项目结构图

![这里写图片描述][SouthEast]

## 二、注解实现 ##

1.将程序入口的//@ServletComponentScan(basePackages = “com.hsy.springboot.servlet”) 解注释

2.将MyServlet 中的 //@WebServlet(urlPatterns = “/myServlet.view”,description = “这事我自定义的servlet”) 解注释。

## 源码 ##

[springboot-servlet][]

## 历史文章 ##

[SpringBoot实战之入门][SpringBoot]

[springboot实战之文章汇总][springboot]

[springboot实战之读取配置文件][springboot 1]

[springboot实战之整合jsp模版引擎][springboot_jsp]

[springboot实战之整合freemarker模版引擎][springboot_freemarker]

[SouthEast]: /images/20220604/fa9cef57ccbd418c805fa49baf614e80.png
[springboot-servlet]: https://github.com/shiyuan2he/springboot
[SpringBoot]: http://blog.csdn.net/u012806787/article/details/78694912
[springboot]: http://blog.csdn.net/u012806787/article/details/78686998
[springboot 1]: http://blog.csdn.net/u012806787/article/details/78583814
[springboot_jsp]: http://blog.csdn.net/u012806787/article/details/78700999
[springboot_freemarker]: http://blog.csdn.net/u012806787/article/details/78706156