jsp测试过滤器执行的顺序

1.新建一个Dynamic Web Project项目（勾选web.xml），里面新建5个filter文件和一个jsp文件，整体的框架如图所示：

2.ZFilter.java里面的代码如下所示：

package filter;

import java.io.IOException;
import java.io.PrintWriter;

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 ZFilter implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("执行过滤器ZFilter<br>");
		chain.doFilter(request, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}

3.FirstFilter.java里面的代码如下所示：

package filter;

import java.io.IOException;
import java.io.PrintWriter;

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 FirstFilter implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("首先执行过滤器<br>");
		chain.doFilter(request, response);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
	}

}

4.SecondFilter.java里面的代码如下所示：

package filter;

import java.io.IOException;
import java.io.PrintWriter;

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 = "secondFilter", urlPatterns = { "/*" })
public class SecondFilter implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("执行过滤器SecondFilter<br>");
		chain.doFilter(request, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}

5.ThreeFilter.java里面的代码如下所示：

package filter;

import java.io.IOException;
import java.io.PrintWriter;

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 = "threeFilter", urlPatterns = { "/*" })
public class ThreeFilter implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("执行过滤器ThreeFilter<br>");
		chain.doFilter(request, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}

6.FourFilter.java里面的代码如下所示：

package filter;

import java.io.IOException;
import java.io.PrintWriter;

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 = "fourFilter", urlPatterns = { "/*" })
public class FourFilter implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.print("执行过滤器FourFilter<br>");
		chain.doFilter(request, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}

7.web.xml里面的代码如下所示：

<?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"
	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>Servlet</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>zFilter</filter-name>
		<filter-class>filter.ZFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>zFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<filter>
		<filter-name>firstFilter</filter-name>
		<filter-class>filter.FirstFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>firstFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
</web-app>

8.one.jsp里面的代码如下所示：

<%@page import="java.util.Date"%>
<%@ 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>example</title>
</head>
<body>
	<h2>Test</h2>
</body>
</html>

9.在浏览器里面输入http://localhost:8080/Servlet/one.jsp运行之后得到的结果如下所示：