Filter过滤器执行的顺序
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doFilte会形成一个过滤器链，在某个页面执行之前做处理，执行时，交给下一个页面处理，执行在某个页面之后做处理
1：test.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h4>Test Page</h4>
<%
System.out.print("5\ttest.jsp\n");
%>
</body>
</html>
2: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</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>helloFilter</filter-name>
<filter-class>com.filter.HelloFilter</filter-class>
<init-param>
<param-name>name</param-name>
<param-value>root</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>helloFilter</filter-name>
<url-pattern>/test.jsp</url-pattern>
</filter-mapping>
<filter>
<filter-name>secondFilter</filter-name>
<filter-class>com.filter.SecondFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>secondFilter</filter-name>
<url-pattern>/test.jsp</url-pattern>
</filter-mapping>
<filter>
<filter-name>UserNameFilter</filter-name>
<filter-class>com.filter.UserNameFilter</filter-class>
<init-param>
<param-name>username</param-name>
<param-value>Tom</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>UserNameFilter</filter-name>
<url-pattern>/hello.jsp</url-pattern>
</filter-mapping>
<filter>
<filter-name>PasswordFilter</filter-name>
<filter-class>com.filter.PasswordFilter</filter-class>
<init-param>
<param-name>password</param-name>
<param-value>12345</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>PasswordFilter</filter-name>
<url-pattern>/hello.jsp</url-pattern>
</filter-mapping>
</web-app>
3:HelloFilter
package com.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 HelloFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("first init...");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
System.out.println("1\tBefore HelloFilter's chain.doFilter...");
chain.doFilter(request, response);
System.out.println("2\tAfter HelloFilter's chain.doFilter...");
}
@Override
public void destroy() {
System.out.println("first destory...");
}
}
4:SecondFilter
package com.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 SecondFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("second init...");
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
System.out.println("3\tBefore SecondFilter's chain.doFilter...");
chain.doFilter(request, response);
System.out.println("4\tAfter SecondFilter's chain.doFilter...");
}
@Override
public void destroy() {
System.out.println("second destroy...");
}
}
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