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>
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