登陆实例(JSP+Servlet+JavaBean)

最新推荐文章于 2025-05-24 15:54:26 发布

java619

最新推荐文章于 2025-05-24 15:54:26 发布

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分类专栏： JSP学习(包括JavaBean) 文章标签： servlet jsp import input class 数据库

本文链接：https://blog.youkuaiyun.com/Java619/article/details/1359803

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/**************************************************
*Author:Java619
*Time:2006-03-25
*E-Mail:ceun@163.com
*QQ:395676370
**************************************************/

登陆是我们在实际应用中经常用到的,我在这边举个简单的登陆例子,作为抛砖引玉吧!

程序结构如下：

采用JSP+Servlet+JavaBean

1.数据库结构(为简便这边采用access,实际应用中建议采用其他数据库如MySQL,MSSQL等)

==============================

uname 用户名文本型

pword 密码文本型

初始数据uname ：ceun pword ：123

==============================

2.视图(JSP)

<%@page contentType="text/html"%>

<%@page pageEncoding="UTF-8"%>

<html>

<head>

</head>

<body>

<p><form action="<%=request.getContextPath ()%>/CheckServlet" method="post">

</tr>

<tr>

</tr>

<tr>

</tr>

</tr>

</table></form></p>

</center>

</body>

</html>

3.Servlet

* CheckServlet.java

*@author Java619

* Created on 2006年3月25日, 下午6:05

package com.ceun;

import java.io.*;

import java.net.*;

import javax.servlet.*;

import javax.servlet.http.*;

import com.ceun.bean.UserBean;

/**

* @author ceun

* @version

public class CheckServlet extends HttpServlet {

/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.

* @param request servlet request

* @param response servlet response

protected void processRequest(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");

PrintWriter out = response.getWriter();

String name=request.getParameter("uname");

String pword=request.getParameter("pword");

out.println("<br><br><br><hr><center><font color=red size=12><B>");

try{

UserBean user=new UserBean();

if(user.check(name,pword))

out.println("登陆成功");

else

out.println("登陆失败");

}catch(Exception e){

}

out.println("</B></font></center>");

out.close();

}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

/** Handles the HTTP <code>GET</code> method.

* @param request servlet request

* @param response servlet response

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

/** Handles the HTTP <code>POST</code> method.

* @param request servlet request

* @param response servlet response

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

/** Returns a short description of the servlet.

public String getServletInfo() {

return "Short description";

}

// </editor-fold>

}

4.JavaBean

* UserBean.java

*@author Java619

* Created on 2006年3月25日, 下午6:22

* To change this template, choose Tools | Template Manager

* and open the template in the editor.

package com.ceun.bean;

import java.sql.*;

import com.ceun.util.DbUtil;

/**

* @author ceun

public class UserBean {

/** Creates a new instance of UserBean */

public UserBean() {

}

public boolean check(String username,String password)

throws Exception{

Connection con= DbUtil.connectToDb();

Statement stmt=null;

try{

String sql="SELECT * FROM loginInfo "+

" WHERE uname='"+username+"' and pword='"+password+"'";

stmt=con.createStatement();

ResultSet rs=stmt.executeQuery(sql);

if(rs.next()) return true;

}

catch(Exception ex)

{

}finally{

try{

stmt.close();

con.close();

}catch(Exception e){e.printStackTrace();}

}

return false;

}

5.实用类(用于连接数据库)

* DbUtil.java

* Created on 2006年3月25日, 下午6:20

*@author Java619

* To change this template, choose Tools | Template Manager

* and open the template in the editor.

package com.ceun.util;

import java.io.*;

import java.sql.*;

/**

* <strong>DbUtil</strong> is a utility class to create

* a connection to our sample database.

public class DbUtil {

static String driverName="sun.jdbc.odbc.JdbcOdbcDriver";

static String dbUrl="jdbc:odbc:";

public DbUtil() {

}

public static java.sql.Connection connectToDb(String databaseName)throws Exception

{

Connection connection=null;

String connName = dbUrl+databaseName;

Class.forName(driverName).newInstance();

connection = DriverManager.getConnection(connName);

return connection;

}

public static java.sql.Connection connectToDb()throws Exception{

return (connectToDb("logInfo"));

}

6.应用配置文件

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<servlet-name>CheckServlet</servlet-name>

<servlet-class>com.ceun.CheckServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>CheckServlet</servlet-name>

<url-pattern>/CheckServlet</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>

</session-timeout>

</session-config>

<welcome-file-list>