java 代码实现es 分词工具 java es filter

<servlet>
    <servlet-name>AServlet</servlet-name>
    <servlet-class>cn.itcast.web.servlet.AServlet</servlet-class>
  </servlet>
<servlet-mapping>
    <servlet-name>AServlet</servlet-name>
    <url-pattern>/AServlet</url-pattern>
  </servlet-mapping>

<filter>
  	<filter-name>AFilter</filter-name>
  	<filter-class>cn.itcast.web.filter.AFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>AFilter</filter-name>
  	<url-pattern>/AServlet</url-pattern> 表示的是AFilter 的过滤范围，只能是过滤AServlet
  </filter-mapping>

七月 16, 2018 8:44:44 下午 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 3499 ms
七月 16, 2018 8:44:44 下午 org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
七月 16, 2018 8:44:44 下午 org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.82
A过滤器出生了
七月 16, 2018 8:44:45 下午 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
七月 16, 2018 8:44:45 下午 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
七月 16, 2018 8:44:45 下午 org.apache.catalina.startup.Catalina start
INFO: Server startup in 1631 ms

/**
	 * 每次过滤时都会执行
	 */
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
	   System.out.println("AFilter#start");
	   chain.doFilter(request, response);//放行！！ filterChain 对象的dofilter 方法
           System.out.println("AFilter#end");
	}

这个步骤虽然是访问的是AServlet,

<filter>
  	<filter-name>AFilter</filter-name>
  	<filter-class>cn.itcast.web.filter.AFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>AFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>
  <servlet>
    <servlet-name>AServlet</servlet-name>
    <servlet-class>cn.itcast.web.servlet.AServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>AServlet</servlet-name>
    <url-pattern>/AServlet</url-pattern>
  </servlet-mapping>



   <servlet>
    <servlet-name>BServlet</servlet-name>
    <servlet-class>cn.itcast.web.servlet.BServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>BServlet</servlet-name>
    <url-pattern>/BServlet</url-pattern>
  </servlet-mapping>
   	
  
  
  <filter>
  	<filter-name>AFilter</filter-name>
  	<filter-class>cn.itcast.web.filter.AFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>AFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <filter>
  	<filter-name>BFilter</filter-name>
  	<filter-class>cn.itcast.web.filter.BFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>BFilter</filter-name>
  	<url-pattern>/*</url-pattern>
<!--  	<dispatcher>FORWARD</dispatcher> -->
  </filter-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

七月 16, 2018 10:08:53 下午 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 586 ms
七月 16, 2018 10:08:53 下午 org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
七月 16, 2018 10:08:53 下午 org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.82
A过滤器出生了
B过滤器出生了
七月 16, 2018 10:08:53 下午 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
七月 16, 2018 10:08:53 下午 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
七月 16, 2018 10:08:53 下午 org.apache.catalina.startup.Catalina start
INFO: Server startup in 547 ms

<error-page>
     <error-code>500</error-code>
     <location>/500.jsp</location>
  </error-page>

package cn.itcast.web.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;

/**
 * Servlet Filter implementation class CFilter
 */
public class CFilter implements Filter {

    /**
     * Default constructor. 
     */
    public CFilter() {
        // 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

		// 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
	}

}

<filter>
    <display-name>AFilter</display-name>
    <filter-name>AFilter</filter-name>
    <filter-class>cn.itcast.web.filter.AFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>AFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <listener>
    <listener-class>cn.itcast.web.listener.AListener</listener-class>
  </listener>

package cn.itcast.web.filter;

import java.io.IOException;
import java.util.Map;

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

/**
 * 从application中获取Map
 * 从request中得到当前客户端的IP
 * 进行统计工作，结果保存到Map中
 * @author cxf
 *
 */
public class AFilter implements Filter {
	
	 //为了过去servletContext 还有另外一种方法reuqest.getSession()
	private FilterConfig config;
	public void destroy() {
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		/*
		 * 1. 得到application中的map
		 * 2. 从request中获取当前客户端的ip地址
		 * 3. 查看map中是否存在这个ip对应访问次数，如果存在，把次数+1再保存回去
		 * 4. 如果不存在这个ip，那么说明是第一次访问本站，设置访问次数为1
		 */
		/*
		 * 1. 得到appliction
		 */
		ServletContext app = request.getServletContext();
//		ServletContext app = config.getServletContext();
		Map<String,Integer> map = (Map<String, Integer>) app.getAttribute("map");
		/*
		 * 2. 获取客户端的ip地址
		 */
		String ip = request.getRemoteAddr();
		/*
		 * 3. 进行判断
		 */
		if(map.containsKey(ip)) {//这个ip在map中存在，说明不是第一次访问
			int cnt = map.get(ip);
			map.put(ip, cnt+1);
		} else {//这个ip在map中不存在，说明是第一次访问
			map.put(ip, 1);
		}
		System.out.println(map);
		app.setAttribute("map", map);//把map再放回到app中
		
		chain.doFilter(request, response);//肯定放行
	}

	/**
	 * 在服务器启动时就会执行本方法，而且本方法只执行一次！
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		this.config = fConfig;
	}
}

package cn.itcast.web.listener;

import java.util.LinkedHashMap;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class AListener implements ServletContextListener {
	/**
	 * 在服务器启动时创建Map，保存到ServletContext
	 */
    public void contextInitialized(ServletContextEvent sce) {
    	// 创建Map
    	Map<String,Integer> map = new LinkedHashMap<String,Integer>();
    	// 得到ServletContext
    	ServletContext application = sce.getServletContext();
    	// 把map保存到application中
    	application.setAttribute("map", map);
    }

    public void contextDestroyed(ServletContextEvent sce) {
    }
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'show.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
<h1 align="center">显示结果</h1>
<table align="center" width="60%" border="1">
	<tr>
		<th>IP</th>
		<th>次数</th>
	</tr>
<c:forEach items="${applicationScope.map }" var="entry">
	<tr>
		<td>${entry.key }</td>
		<td>${entry.value }</td>
	</tr>
</c:forEach>
</table>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
<!--   index.jsp 游客可以访问 -->
<h1>你就是个游客而已</h1>
<a href="<c:url value='/index.jsp'/>">游客入口</a><br/>
<a href="<c:url value='/users/u.jsp'/>">会员入口</a><br/>
<a href="<c:url value='/admin/a.jsp'/>">管理员入口</a><br/>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'login.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
<h1>登录</h1>
${msg }
<form action="<c:url value='/LoginServlet'/>" method="post">
用户名：<input type="text" name="username"/>
<input type="submit" value="登录"/>
</form>
  </body>
</html>