38 過濾器

image.png

2.一個(gè)簡(jiǎn)單的過濾器

1.任何過濾器都要實(shí)現(xiàn)javax.servlet.Filter 接口
2.在web.xml 中對(duì)過濾器進(jìn)行配置代兵，說明Url的范圍
3.在過濾器的doFilter（）方法中編寫過濾器的功能代碼

//MyFirstFilter .java
package com.imooc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class MyFirstFilter implements Filter{

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        System.out.println("過濾器已被銷毀");//tomcat停止時(shí)，這里會(huì)執(zhí)行
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        System.out.println("過濾器已生效");//每一個(gè)請(qǐng)求過來以后乾忱，在這里進(jìn)行攔截處理
        chain.doFilter(request, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        System.out.println("過濾器初始化成功");//web應(yīng)用啟動(dòng)時(shí)自動(dòng)執(zhí)行
    }
    
}

//web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>first_filter</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- filter標(biāo)簽用于說明哪個(gè)類是過濾器惯疙，并在應(yīng)用啟動(dòng)時(shí)誉券，自動(dòng)加載 -->
  <filter>
    <filter-name>MyFirstFilter</filter-name>
    <filter-class>com.imooc.filter.MyFirstFilter</filter-class>
  </filter>
  <!--
    filter-mapping 標(biāo)簽用于說明過濾器對(duì)URL應(yīng)用的范圍瓶摆，要點(diǎn)有二：
    1.filter-name 過濾器名稱與filter.filter-name保持一致 
    2.url-pattern 說明過濾器作用范圍阁危，/* 代表對(duì)所有URL進(jìn)行過濾
   -->
  <filter-mapping>
    <filter-name>MyFirstFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

//HelloServlet.java
package com.imooc.filter;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class HelloServlet
 */
@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public HelloServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.getWriter().println("Hello World");
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

只要是訪問http://localhost:8080/first_filter/下的任何有效地址，由于web.xml配置的是/*,都會(huì)執(zhí)行doFilter方法擂煞，輸出過濾器生效

3.過濾器的兩種開發(fā)方式

3.1 配置形式

image.png

3.2 注解形式

image.png

xml配置的過濾器優(yōu)先執(zhí)行于注解配置的過濾器，但是項(xiàng)目中不要對(duì)兩種形式混用

//注解形式
package com.imooc.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

/**
 * Servlet Filter implementation class MyAnnotationFilter
 */
@WebFilter(filterName="MyAnnotationFilter",urlPatterns="/*")
public class MyAnnotationFilter implements Filter {

    /**
     * Default constructor. 
     */
    public MyAnnotationFilter() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Filter#destroy()
     */
    public void destroy() {
        // TODO Auto-generated method stub
    }

    /**
     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        // place your code here
        System.out.println("注解形式過濾器已經(jīng)生效");
        // pass the request along the filter chain
        chain.doFilter(request, response);
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    public void init(FilterConfig fConfig) throws ServletException {
        // TODO Auto-generated method stub
    }

}

4字符集過濾器

image.png

package com.imooc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CharacterEncodingFilter implements Filter {

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        HttpServletRequest req = (HttpServletRequest)request;
        //HttpServletRequest的父接口是ServletRequest
        req.setCharacterEncoding("UTF-8");
        HttpServletResponse res = (HttpServletResponse)response;
        response.setContentType("text/html;charset=UTF-8");
        chain.doFilter(request, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub

    }

}

其實(shí)就是趴乡，request和response對(duì)于中文字符对省，都需要命令設(shè)置。原來是放在doGet或者doPost中晾捏，因?yàn)檫^濾器每條request和response都會(huì)在這里處理蒿涎，因此在可以在過濾器這里設(shè)置字符集命令會(huì)很方便

5過濾器參數(shù)化標(biāo)簽

image.png

5.1

web.xml

如上圖，在web.xml中定義參數(shù)

CharacterEncodingFilter.java

如上圖惦辛，在CharacterEncodingFilter.java 中加載參數(shù)劳秋，然后使用
過濾器參數(shù)化標(biāo)簽的好處，
在web.xml中定義參數(shù)胖齐，因?yàn)閣eb.xml是文本玻淑，不用編譯，修改參數(shù)呀伙，重啟應(yīng)用就可以用了补履，如果在程序中寫死，需要重新便宜区匠，而且比較麻煩

5.2 也可以使用注解

image.png

6 UrlPattern設(shè)置過濾范圍

image.png

6.1 配置模式

//web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>url-pattern</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <filter>
    <filter-name>UrlPatternFilter</filter-name>
    <filter-class>com.imooc.filter.UrlPatternFilter</filter-class>      
  </filter>
  <filter-mapping>
    <filter-name>UrlPatternFilter</filter-name>
    <url-pattern>/test.jsp</url-pattern> <!-- 精準(zhǔn)攔截 -->
  </filter-mapping>
  <filter-mapping>
    <filter-name>UrlPatternFilter</filter-name>
    <url-pattern>/</url-pattern> <!-- 攔截根目錄 -->
  </filter-mapping>
  <filter-mapping>
    <filter-name>UrlPatternFilter</filter-name>
    <url-pattern>/*</url-pattern> <!-- 攔截根目錄后面的所有 -->
  </filter-mapping>
</web-app>

//UrlPatternFilter.jsp
package com.imooc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/*@WebFilter(filterName="UrlPatternFilter" , urlPatterns= {
        "/","/Servlet/*","*.jsp"
})*/
public class UrlPatternFilter implements Filter{

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse res = (HttpServletResponse)response;
        System.out.println("攔截到:" + req.getRequestURL());
        chain.doFilter(request, response);      
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        
    }
    
}

//test.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    I'm test page!
</body>
</html>

//index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    I'm index.jsp
</body>
</html>

//SampleServlet1 .java
package com.imooc.filter;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class SampleServlet1
 */
@WebServlet("/servlet/sample1")
public class SampleServlet1 extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SampleServlet1() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.getWriter().println("I'm "+ this.getClass().getSimpleName());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

//
package com.imooc.filter;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class SampleServlet1
 */
@WebServlet("/")
public class SampleServlet2 extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SampleServlet2() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.getWriter().println("I'm "+ this.getClass().getSimpleName());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

//SampleServlet2.java
package com.imooc.filter;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class SampleServlet1
 */
@WebServlet("/")
public class SampleServlet2 extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public SampleServlet2() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.getWriter().println("I'm "+ this.getClass().getSimpleName());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

注意:

index.jsp 是默認(rèn)首頁(yè)干像，在訪問http://localhost:8080/url-pattern/時(shí)會(huì)訪問默認(rèn)首頁(yè)，但是默認(rèn)首頁(yè)的存在驰弄，會(huì)使映射地址也為

@WebServlet("/")
public class SampleServlet2 extends HttpServlet {

的servlet失效麻汰，因此戚篙，在實(shí)際開發(fā)中岔擂，盡量避免使用默認(rèn)首頁(yè)，避免帶來一些訪問失效的問題

6.2 使用注解

image.png

7.過濾鏈

image.png

//FilterB 
package com.imooc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
@WebFilter(filterName="FilterB" , urlPatterns="/*")
public class FilterB implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        System.out.println("I'm Filter B");
        chain.doFilter(request, response);
        
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

}

//FilterC.java
package com.imooc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
@WebFilter(filterName="FilterC" , urlPatterns="/*")
public class FilterC implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        System.out.println("I'm Filter C");
        chain.doFilter(request, response);
        
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

}

//FilterZ.java
package com.imooc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
@WebFilter(filterName="FilterZ" , urlPatterns="/*")
public class FilterZ implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        System.out.println("I'm Filter Z");
        chain.doFilter(request, response);
        
    }

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

}

//HelloServlet.java
package com.imooc.filter;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class HelloServlet
 */
@WebServlet("/hello")
public class HelloServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public HelloServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().print("Hello World!");
        System.out.println("Hello World!");
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

//web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>filter-chain</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <filter>
    <filter-name>FilterA</filter-name>
    <filter-class>com.imooc.filter.FilterA</filter-class>
  </filter>
  <filter>
    <filter-name>FilterB</filter-name>
    <filter-class>com.imooc.filter.FilterB</filter-class>
  </filter>
  <filter>
    <filter-name>FilterC</filter-name>
    <filter-class>com.imooc.filter.FilterC</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>FilterA</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <filter-mapping>
    <filter-name>FilterB</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <filter-mapping>
    <filter-name>FilterC</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

注意：
1.在配置文件web.xml中，是根據(jù)·filter-mapping·的順序決定過濾鏈的順序掘鄙，而在注解中嗡髓，是根據(jù)過濾器的類名的按照名稱升序排序，顯然前者更靠譜浊伙，后者不可控蛹稍。
2.chain.doFilter(request, response);可控制是否繼續(xù)傳遞唆姐，利用它奉芦，可以對(duì)特定條件的東西判斷是否執(zhí)行該函數(shù)声功。

8.多端設(shè)備頁(yè)面自動(dòng)設(shè)備

思路：不同的設(shè)備先巴，如手機(jī)和電腦的顯示界面是不同的冒冬，對(duì)于不同設(shè)備的request简烤，應(yīng)該返回適合當(dāng)前設(shè)備的頁(yè)面

package com.imooc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DeviceAdapterFilter implements Filter{

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse res = (HttpServletResponse)response;
        //在請(qǐng)求的地址前加上辨識(shí)的字符横侦，重構(gòu)URI
        /*
         /index.html
         PC: /desktop/index.html
         MOBILE: /mobile/index.html
         /test.html
         PC: /desktop/test.html
         MOBILE: /mobile/test.html
         */
        String uri = req.getRequestURI();
        System.out.println("URI:"+uri);
        if(uri.startsWith("/desktop") || uri.startsWith("/mobile")) {
            //本來就有標(biāo)識(shí)符枉侧，那么就直接傳遞
            chain.doFilter(request, response);
        }else {
            String userAgent = req.getHeader("user-agent");
            String targetURI = "";
            if(userAgent.indexOf("android")!=-1 || userAgent.indexOf("iphone")!=-1) {
                targetURI = "/mobile"+uri;
                System.out.println("移動(dòng)端設(shè)備正在訪問榨馁，重新跳轉(zhuǎn)URI:" + targetURI);
                res.sendRedirect(targetURI);
            }else {
                targetURI = "/desktop"+uri;
                System.out.println("移動(dòng)端設(shè)備正在訪問，重新跳轉(zhuǎn)URI:" + targetURI);
                res.sendRedirect(targetURI);
            }
        }
        
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>device-adapter</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <filter>
    <filter-name>DeviceAdapterFilter</filter-name>
    <filter-class>com.imooc.filter.DeviceAdapterFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>DeviceAdapterFilter</filter-name>
    <url-pattern>*.html</url-pattern>
  </filter-mapping>
</web-app>

最后編輯于：2020.02.13 16:53:23

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38 過濾器

2.一個(gè)簡(jiǎn)單的過濾器

3.過濾器的兩種開發(fā)方式

3.1 配置形式

3.2 注解形式

4字符集過濾器

5過濾器參數(shù)化標(biāo)簽

5.1

5.2 也可以使用注解

6 UrlPattern設(shè)置過濾范圍

6.1 配置模式

6.2 使用注解

7.過濾鏈

8.多端設(shè)備頁(yè)面自動(dòng)設(shè)備

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