监听器的使用,以及实现, 测试

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>MyFilter</display-name> <filter> <filter-name>Myfilter</filter-name> <filter-class>com.MyFilter</filter-class> </filter> <filter-mapping> <filter-name>Myfilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>Test</servlet-name> <servlet-class>com.Test</servlet-class> </servlet> <servlet-mapping> <servlet-name>Test</servlet-name> <url-pattern>/test</url-pattern> </servlet-mapping> </web-app>

 

1 //这是我的自定义监听 2 import java.io.IOException; 3 4 import javax.servlet.Filter; 5 import javax.servlet.FilterChain; 6 import javax.servlet.FilterConfig; 7 import javax.servlet.ServletException; 8 import javax.servlet.ServletRequest; 9 import javax.servlet.ServletResponse; 10 import javax.servlet.http.HttpServletRequest; 11 12 public class MyFilter implements Filter{ 13 14 @Override 15 public void destroy() { 16 17 } 18 19 @Override 20 public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException { 21 22 HttpServletRequest request =( HttpServletRequest)arg0; 23 24 25 System.out.println("----->"+request.getRequestURI()); 26 27 if("/MyFilter/test".equals(request.getRequestURI())){ 28 arg2.doFilter(arg0, arg1); 29 } 30 } 31 32 @Override 33 public void init(FilterConfig arg0) throws ServletException { 34 35 } 36 } 37 38 39 import javax.servlet.ServletRequest; 40 import javax.servlet.ServletResponse; 41 import javax.servlet.http.HttpServlet; 42 43 public class Test extends HttpServlet{ 44 45 private static final long serialVersionUID = 1L; 46 47 @Override 48 public void service(ServletRequest arg0, ServletResponse arg1){ 49 System.out.println("我是MyFilter类的测试标识"); 50 51 } 52 }

主要是针对WEB开发的3大包装类的监听

转载于:https://www.cnblogs.com/Toolo/p/3737212.html