作业2-5问题 ，关于页面乱码及进入不了过滤器

问题1：为什么我加了字符集转换的过滤器以后，页面显示乱码，不加的话就正常显示中文

页面：

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>listener</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>
  
  <listener>
  	<listener-class>com.imooc.listener.WebListener</listener-class>
  </listener>
  
  <listener>
  	<listener-class>com.imooc.listener.WebAttributeListener</listener-class>
  </listener>
  
  <servlet>
  	<servlet-name>login</servlet-name>
  	<servlet-class>com.imooc.servlet.LoginServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>login</servlet-name>
  	<url-pattern>/login</url-pattern>
  </servlet-mapping>
  
 <filter>
  	<filter-name>charsetFilter</filter-name>
  	<filter-class>com.imooc.filter.CharsetFilter</filter-class>
  	<init-param>
  		<param-name>charset</param-name>
  		<param-value>UTF-8</param-value>
  	</init-param>
  </filter>
  <filter-mapping>
  	<filter-name>charsetFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
  
   <filter>
  	<filter-name>loginFilter</filter-name>
  	<filter-class>com.imooc.filter.LoginFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>loginFilter</filter-name>
  	<url-pattern>/listener/index.html</url-pattern>
  </filter-mapping>
  
</web-app>

CharsetFilter

ppackage 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 CharsetFilter implements Filter{

	private String charset;

	@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 resp = (HttpServletResponse)response;
		req.setCharacterEncoding(charset);
		resp.setContentType("text/html;charset="+charset);
		chain.doFilter(request, response);

	}

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		charset = filterConfig.getInitParameter("charset");

	}

}

问题2：当我直接访问index.html的时候，进入不了loginFilter这个过滤器，这个是为什么

LoginFilter：

​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 LoginFilter 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 resp = (HttpServletResponse)response;
		System.out.println("==="+req.getRequestURI());
		if(req.getSession().getAttribute("userName")!=null) {
			chain.doFilter(request, response);
		}else {
			resp.sendRedirect("/listener/login.html");
		}

	}

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

	}

}