SpringBoot（二）：Web之Filter

一、添加Filter、Listen、Serlvet兩方式

• 代碼註冊經過ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 得到控制。 
  也能夠經過實現 ServletContextInitializer 接口直接註冊。代碼式實例

 

• 在 SpringBootApplication 上使用@ServletComponentScan 註解後，Servlet、Filter、Listener 能夠直接經過 @WebServlet、@WebFilter、@WebListener 註解自動註冊，無需其餘代碼。

二、註解實現方式

• MyFilter.java

@WebFilter(servletNames="myFilter",urlPatterns = "/*")
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        if (servletRequest instanceof HttpServletRequest) {
            System.out.println(MessageFormat.format("請求路徑url=>{0}", ((HttpServletRequest) servletRequest).getRequestURI()));
        }
        filterChain.doFilter(servletRequest, servletResponse);

    }

    @Override
    public void destroy() {

    }
}

• QuickStartApplication.java

@ServletComponentScan
@SpringBootApplication
public class QuickStartApplication {

	public static void main(String[] args) {
		SpringApplication.run(QuickStartApplication.class, args);
	}
}

   

http://localhost:8080/getUser.do,後臺日誌輸出

請求路徑url=>/getUser.do
name=>小王