用Servlet创建登录页面

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Servlet代码

package org.psh.dao;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.psh.util.DBUtil;

public class RegServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doPost(request, response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setCharacterEncoding("utf-8");
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html");
        String username = request.getParameter("username");
        String pwd = request.getParameter("pwd");
        boolean isTrue = false;
        Connection conn = DBUtil.getConn();
        String sql = "select * from student where    pwd =? and user_name= ?";
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, pwd);
            ps.setString(2, username);
            rs = ps.executeQuery();
            if (rs.next()) {
                isTrue = true;
            } else {
                isTrue = false;
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        DBUtil.close( null,conn, ps);
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        if (isTrue) {
            out.println("登录成功");
        } else {
            out.println("登录失败");
        }
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

}
 

index代码

<%@ 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>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</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="regServlet" method="post">
       用户名:<input type="text" name="userName" />
       密码:<input type="password" name="pwd" />
       <input type="submit" value="登录" />
   </form>
  </body>
</html>

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