jsp-servlet简单登陆界面 有数据库连接
使用mysql数据库
使用tomcat服务器
数据库连接类：
package com.servlet;
import java.sql.*;
public class conn {
public static String name;
public static String mima;
public conn(String name,String mima){
conn.name =name;
conn.mima=mima;
// 1. 注册驱动
try {
Class.forName("com.mysql.jdbc.Driver");
} catch(ClassNotFoundException ex) {
ex.printStackTrace();
}
}
public ResultSet date() {
// 声明变量，使用，而后关闭
Connection conn = null; //数据库连接
Statement stmt = null; //数据库表达式
ResultSet rs = null; //结果集
try {
//2. 获取数据库的连接
conn = DriverManager.getConnection
("jdbc:mysql://localhost:3306/dl","root","");
//3. 获取表达式
stmt = conn.createStatement();
//4. 执行SQL
String sql = "select * from login where user='" + name
+ "' and pass = '" + mima + "'";
rs = stmt.executeQuery(sql);
//5. 现实结果集里面的数据
//5. 现实结果集里面的数据
// while(rs.next()) {
// System.out.println("id为123的time值=" + rs.getString(1));
// }
}
catch (Exception ex) {
ex.printStackTrace();
}
finally {
}
return rs;
}
}
HttpServlet类：
package com.servlet;
import java.io.IOException;
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 com.sun.corba.se.spi.orbutil.fsm.Guard.Result;
import com.sun.xml.internal.bind.v2.runtime.Name;
/**
* @author Administrator
*
*/
public class login extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
String name=req.getParameter("name");
String mima=req.getParameter("mima");
conn conn=new conn(name ,mima);
ResultSet rs=conn.date();
try {
if (rs.next())
{
resp.sendRedirect("sucessed.jsp?name="+name);
} else
//否则登录失败
{
resp.sendRedirect("index.jsp");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.servlet.login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/jump.jsp</url-pattern>
</servlet-mapping>
</web-app>
index.php:
<%@ 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>
系 统 登 录
<form action="../dl/jump.jsp" method="post">
用户名
<input type="text" name="name">
<br>
密 码
<input type="password" name="mima" />
<br>
<input type="submit" value="登录">
<input type="reset" value="取消">
</form>
</body>
</html>
sucessed.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>
<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>
您好：
<%String name = request.getParameter("name");
out.print(name);
%>
</body>
</html>