Filter-细节-过滤器拦截路径配置
Filter-细节-过滤器拦截路径配置
1.具体资源路径：/index.jsp只有访问index.jsp资源时，过滤器才会被执行
2.拦截目录：/user/*访问/user下的所有资源时，过滤器都会被执行
3.后缀名拦截：*.jsp访问所有后缀名为jsp资源时，过滤器都会被执行
4.拦截所有资源：/*访问所有资源时，过滤器都会被执行
1.具体资源路径：/index.jsp只有访问index.jsp资源时，过滤器才会被执行
创建hello.jsp
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %> <!DOCTYPE html> <html> <head> <title>JSP - Hello World</title> </head> <body> hello.jsp </body> </html>
FilterDemo4类
package com.example.filter; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException; @WebFilter(value = "/index.jsp")// 1.具体资源路径：/index.jsp 只有访问index.jsp时，过滤器才会执行 public class FilterDemo4 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("filterDemo4...."); } @Override public void destroy() { } }
我们运行代码，只有访问index.jsp的时候，控制台才会输出FilterDemo4...，访问hello.jsp的时候，控制台不会输出
2. 拦截目录： /user/* 访问/user下的所有资源时，过滤器都会被执行
FilterDemo4类
package com.example.filter; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException; //@WebFilter(value = "/index.jsp")// 1.具体资源路径：/index.jsp 只有访问index.jsp时，过滤器才会执行 @WebFilter("/user/*")//2. 拦截目录： /user/* 访问/user下的所有资源时，过滤器都会被执行 public class FilterDemo4 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("filterDemo4...."); } @Override public void destroy() { } }
创建两个ServletDemo
package com.example.day_19_fitterlistener.servlet; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/user/findAllServlet") public class ServletDemo1 extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("findAllServlet..."); super.doPost(req, resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doGet(req, resp); } }
package com.example.day_19_fitterlistener.servlet; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/user/updateServlet") public class ServletDemo2 extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("updateServlet..."); super.doPost(req, resp); } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doGet(req, resp); } }
/user/* 访问/user下的所有资源时，过滤器都会被执行
3. 后缀名拦截： *.jsp 访问所有后缀名为jsp资源时，过滤器都会被执行
package com.example.filter; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException; //@WebFilter(value = "/index.jsp")// 1.具体资源路径：/index.jsp 只有访问index.jsp时，过滤器才会执行 //@WebFilter("/user/*")//2. 拦截目录： /user/* 访问/user下的所有资源时，过滤器都会被执行 @WebFilter("*.jsp")//3. 后缀名拦截： *.jsp 访问所有后缀名为jsp资源时，过滤器都会被执行 public class FilterDemo4 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("filterDemo4...."); } @Override public void destroy() { } }
只有访问后缀名为jsp的才会输出
4.拦截所有资源：/*访问所有资源时，过滤器都会被执行
package com.example.filter; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import java.io.IOException; //@WebFilter(value = "/index.jsp")// 1.具体资源路径：/index.jsp 只有访问index.jsp时，过滤器才会执行 //@WebFilter("/user/*")//2. 拦截目录： /user/* 访问/user下的所有资源时，过滤器都会被执行 //@WebFilter("*.jsp")//3. 后缀名拦截： *.jsp 访问所有后缀名为jsp资源时，过滤器都会被执行 @WebFilter("/*") // 4.拦截所有资源：/*访问所有资源时，过滤器都会被执行 public class FilterDemo4 implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { System.out.println("filterDemo4...."); } @Override public void destroy() { } }
/*访问所有资源时，过滤器都会被执行
