为什么网页显示 ？？？？号
修改成utf-8和gbk都不行。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>欢迎</title>
</head>
<body>
欢迎
<% request.setCharacterEncoding("gbk");
String name = request.getParameter("username");
%>
<%=name%>
进入！！！
</body>
</html>
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#web.xml添加
<filter>
<filter-name>setEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>setEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
试试！
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