SpringBoot之自定义Servlet

生产中我们有时候需要自定义servlet比如,对一些特定的资源路径进来的请求,做一些特殊处理，本文，介绍两种自定义的方法。

目录

• @WebServlet 注解方式
• 注册ServletRegistrationBean

1.@WebServlet 注解方式

使用该方式注意一点，就是要与 @ServletComponentScan 配合使用

  

   

    

     

    
    

     

      @WebServlet(urlPatterns = "/api", description = "api进来的通过该servlet")
     
    
   

    

     

    
    

     

      public class ApiGateWayServlet extends HttpServlet {
     
    
   

    

     

    
    

     
    private ApplicationContext applicationContext;
     
    
   

    

     

    
    

     
    private ApiGateWayHandler apiGateWayHandler;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    @Override
     
    
   

    

     

    
    

     
    public void init() throws ServletException {
     
    
   

    

     

    
    

     
        super.init();
     
    
   

    

     

    
    

     

              applicationContext = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
     
    
   

    

     

    
    

     

              apiGateWayHandler = applicationContext.getBean(ApiGateWayHandler.class);
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    @Override
     
    
   

    

     

    
    

     
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
     
    
   

    

     

    
    

     

              apiGateWayHandler.handle(req,resp);
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     

      }
     
    
  
 

  
 
 

在启动类，添加ServeltComponentScan

  

   

    

     

    
    

     

      @ServletComponentScan
     
    
   

    

     

    
    

     

      @SpringBootApplication
     
    
   

    

     

    
    

     

      public class SpringBootSampleApplication {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
    public static void main(String[] args) {
     
    
   

    

     

    
    

     
        ConfigurableApplicationContext configurableApplicationContext = SpringApplication.run(SpringBootSampleApplication.class, args);
     
    
   

    

     

    
    

     

              SpringContextUtils.setApplicationContext(configurableApplicationContext);
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     

      }
     
    
  
 

2. 注册ServletRegistrationBean

  

   

    

     

    
    

     

      @SpringBootApplication
     
    
   

    

     

    
    

     

      public class SpringBootSampleApplication {
     
    
   

    

     

    
    

     
    @Bean
     
    
   

    

     

    
    

     
    public ServletRegistrationBean servletRegistrationBean() {
     
    
   

    

     

    
    

     
        return new ServletRegistrationBean(new ApiGateWayServlet(), "/*");
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     
    public static void main(String[] args) {
     
    
   

    

     

    
    

     
        ConfigurableApplicationContext configurableApplicationContext = SpringApplication.run(SpringBootSampleApplication.class, args);
     
    
   

    

     

    
    

     

              SpringContextUtils.setApplicationContext(configurableApplicationContext);
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     

      }
     
    
  
 

3.check是否配置成功

  

   

    

     

    
    

     

      2017-09-19 10:44:28.313  INFO 6761 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'apiGateWayServlet' to [/*]
     
    
   

    

     

    
    

     

      2017-09-19 10:44:28.315 INFO 6761 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
     
    
   

    

     

    
    

     

      
     
    
  
 

文章来源: springlearn.blog.csdn.net，作者：西魏陶渊明，版权归原作者所有，如需转载，请联系作者。

原文链接：springlearn.blog.csdn.net/article/details/102425338