Fitter-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>
创建过滤器
package com.example.day_19_fitterlistener.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
/**
* 过滤器快速入门
*/
@WebFilter("/index.jsp")//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
public class FilterDemo4 implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
Filter.super.init(filterConfig);
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("FitterDemo4......");
}
@Override
public void destroy() {
Filter.super.destroy();
}
}
我们运行代码，只有访问index.jsp的时候控制台才会输出FitterDemo4.....，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
创建FitterDemo4
package com.example.day_19_fitterlistener.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
/**
* 过滤器快速入门
*/
//@WebFilter("/index.jsp")//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
@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 {
Filter.super.init(filterConfig);
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("FitterDemo4......");
}
@Override
public void destroy() {
Filter.super.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);
}
}
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.day_19_fitterlistener.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
/**
* 过滤器快速入门
*/
//@WebFilter("/index.jsp")//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
//@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 {
Filter.super.init(filterConfig);
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println("FitterDemo4......");
}
@Override
public void destroy() {
Filter.super.destroy();
}
}
只有访问后缀名为jsp的才会输出
最后一种，咱们之前已经展示过， 在这里就不展示了
标签：index,Fitter,jsp,过滤器,import,拦截,servlet,javax From： https://www.cnblogs.com/yuzong/p/17074909.html