java代码：
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet1 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
String passwrod = request.getParameter("passwrod");
//显示
response.getWriter().write("用户名 ："+username);
response.getWriter().write("密码："+passwrod);
}
}
Filter代码
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;
public class FilterDemo3 implements Filter {
private FilterConfig filterConfig;
public FilterDemo3()
{
}
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
//Web容器调用
public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
String encoding = filterConfig.getInitParameter("encoding");
//POST请求编码设置
request.setCharacterEncoding(encoding);
//响应编码设置
response.setContentType("text/html;charset="+encoding);
chain.doFilter(request,response);
}
public void destroy() {
}
}
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>
<title>登陆页面</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>
<form action="${pageContext.request.contextPath}/LoginServlet1" method="post">
<table border="1" align="center">
<caption>用户登陆</caption>
<tr>
<th>用户名</th>
<td><input type="text" name="username"/>
</td>
</tr>
<tr>
<th>用户密码</th>
<td><input type="password" name="passwrod"/>
</td>
</tr>
<tr>
<td colspan="5" align="center">
<input type="submit" value="提交"/>
</td>
</tr>
</table>
</form>
</body>
</html>
web.xml
<filter>
<filter-name>FilterDemo3</filter-name>
<filter-class>cn.web.servlet.filter.FilterDemo3</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>FilterDemo3</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
