问题描述
某一页面乱码
项目目录结构
CharacterEncodingFilter.java
package com.edu.nefu.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
@WebFilter(filterName = "CharacterEncodingFilter")
public class CharacterEncodingFilter implements Filter {
FilterConfig cofigF = null;
private String encoding;
private boolean forceEncoding;
public void init(FilterConfig config) throws ServletException {
this.cofigF = config;
encoding = config.getInitParameter("encoding");
forceEncoding = Boolean.parseBoolean(config.getInitParameter("forceEncoding"));
}
public void destroy() {
cofigF = null;
encoding = null;
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
// response.setCharacterEncoding("utf-8");
// request.setCharacterEncoding("utf-8");
// response.setContentType("text/html;charset=utf-8");
if (this.encoding != null && (this.forceEncoding || request.getCharacterEncoding() == null)) {
request.setCharacterEncoding(this.encoding);
if (this.forceEncoding) {
response.setCharacterEncoding(this.encoding);
}
}
chain.doFilter(request, response);
}
}
乱码文件 login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>登录</title>
<link rel="stylesheet" href="form.css"/>
<script src="../../js/jquery-3.6.1.js"></script>
<script>
function check() {
let formData = $(".information");
let submit = true;
formData.each(function (idx, ele) {
if (ele.value === "") {
ele.focus();
alert("不可为空");
submit = false;
return false;
}
});
return submit;
}
</script>
</head>
<body>
<h1 style="text-align: center">用户登录</h1>
<div class="box">
<form action="login.jsp" method="post" onsubmit="return check();">
<div class="item">
<label class="label" for="un">用户名</label>
<input class="information" type="text" name="un" id="un">
</div>
<div class="item">
<label class="label" for="pw">密码</label>
<input class="information" type="password" name="pw" id="pw">
</div>
<div class="item div-button">
<input type="button" id="button-register" onclick="location.href='register.html'" value="注册">
<input type="submit" id="button-login" value="登录 ">
</div>
</form>
</div>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- <!–登录 Servlet–>-->
<!-- <servlet>-->
<!-- <servlet-name>LoginServlet</servlet-name>-->
<!-- <servlet-class>com.edu.nefu.servlet.LoginServlet</servlet-class>-->
<!-- </servlet>-->
<!-- <servlet-mapping>-->
<!-- <servlet-name>LoginServlet</servlet-name>-->
<!-- <url-pattern>/LoginServlet</url-pattern>-->
<!-- </servlet-mapping>-->
<!-- <!–注册 Servlet–>-->
<!-- <servlet>-->
<!-- <servlet-name>RegisterServlet</servlet-name>-->
<!-- <servlet-class>com.edu.nefu.servlet.RegisterServlet</servlet-class>-->
<!-- </servlet>-->
<!-- <servlet-mapping>-->
<!-- <servlet-name>RegisterServlet</servlet-name>-->
<!-- <url-pattern>/RegisterServlet</url-pattern>-->
<!-- </servlet-mapping>-->
<!-- <!–登录 filter–>-->
<!-- <filter>-->
<!-- <filter-name>LoginFilter</filter-name>-->
<!-- <filter-class>com.edu.nefu.filter.LoginFilter</filter-class>-->
<!-- </filter>-->
<!-- <filter-mapping>-->
<!-- <filter-name>LoginFilter</filter-name>-->
<!-- <url-pattern>/LoginServlet</url-pattern>-->
<!-- </filter-mapping>-->
<!--编码 filter-->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>com.edu.nefu.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
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