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<br><br>  }<br><br>   @Override<br>   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)<br>           throws IOException, ServletException {<br>      HttpServletRequest req = (HttpServletRequest)request;<br>       HttpServletResponse resp = (HttpServletResponse)response;<br>       req.setCharacterEncoding(charset);<br>      resp.setContentType("text/html;charset="+charset);<br>      chain.doFilter(request, response);<br><br>  }<br><br>   @Override<br>   public void init(FilterConfig filterConfig) throws ServletException {<br>       charset = filterConfig.getInitParameter("charset");<br><br> }<br><br>}<br>

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<br><br>  }<br><br>   @Override<br>   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)<br>           throws IOException, ServletException {<br>      HttpServletRequest req = (HttpServletRequest)request;<br>       HttpServletResponse resp = (HttpServletResponse)response;<br>       System.out.println("==="+req.getRequestURI());<br>      if(req.getSession().getAttribute("userName")!=null) {<br>           chain.doFilter(request, response);<br>      }else {<br>         resp.sendRedirect("/listener/login.html");<br>      }<br><br>   }<br><br>   @Override<br>   public void init(FilterConfig filterConfig) throws ServletException {<br>       // TODO Auto-generated method stub<br><br>  }<br><br>}<br>

RedJoker 2021-05-28

源自：监听器 2-5 项目作业

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1回答

好帮手慕小脸 2021-05-29 13:43:45

同学你好，

1、这里应该是编码格式的问题，猜测不乱码时编码格式为GBK，所以当设置字符集转换的过滤器以后(UTF-8)就会产生乱码

2、这里同学可以参考其他同学的思路检查一下自己的判断是否有问题：

https://class.imooc.com/course/qadetail/281374

祝学习愉快~

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提问者 RedJoker #1

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form action="/listener/login" method="post"> 用户名：<input type="text" id="userName" name="userName"> 密码：<input type="password" id="pwd" name="pwd"> <input type="submit"> </form> </body> </html> 

这是我页面的代码，页面上也是UTF-8

2021-05-29 14:25:34