<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

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<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

   

    This is my JSP page.

注册页面代码：

<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<%@ page import="java.sql.*"%>

<%!

 public static final String DBDRIVER = "com.MySQL.jdbc.Driver" ;

 public static final String userName = "root";   //登录的用户名

 public static final String userPasswd = "taizhen";  //登录mysql密码

 public static final String dbName = "test";  //数据库名

 public static final String tableName="user"; //表名

 public static final String DBURL = "jdbc:mysql://localhost:3306/"+dbName+"?user="+userName+"&password="+userPasswd;

%>

<%

  Connection conn = null ;

  PreparedStatement pstmt = null ;

  ResultSet rs = null ;

  boolean flag = false ; // 表示登陆成功或失败的标记

%>

<%

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

if(null==action){

}else{

%>

 <%out.println(action); %>

<% 

String name = request.getParameter("username") ; // 接收表单参数

String password = request.getParameter("password") ; // 接收表单参数

try{

  Class.forName(DBDRIVER) ;

  conn = DriverManager.getConnection(DBURL) ;

  String sql = "SELECT name,password FROM user WHERE name=? AND password=?" ;

  pstmt = conn.prepareStatement(sql) ;

  pstmt.setString(1,name) ;

  pstmt.setString(2,password) ;

  rs = pstmt.executeQuery() ;

  while(rs.next()){

   // 如果有内容，则此处执行，表示查询出来，合法用户

       flag = true ;

 }

}catch(Exception e){

}finally{

 try{

  conn.close() ; // 连接一关闭，所有的操作都将关闭

 }catch(Exception e){}

}

%>

<%out.println(flag); %>

<%out.println(action); %>

<%

if(flag){

request.getSession().setAttribute("success", "登录");

%>

<%

}else{  // 登陆失败，跳转到failure.jsp

request.getSession().setAttribute("error", "登录");

%> 

<%

}

}

%>

   

链接数据库代码：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<%@ page import="java.sql.*"%>

<%!

 public static final String DBDRIVER = "com.mysql.jdbc.Driver" ;

 public static final String userName = "root";   //登录的用户名

 public static final String userPasswd = "taizhen";  //登录mysql密码

 public static final String dbName = "test";  //数据库名

 public static final String tableName="user"; //表名

 public static final String DBURL = "jdbc:mysql://localhost:3306/"+dbName+"?user="+userName+"&password="+userPasswd;

%>

<%

  Connection conn = null ;

  PreparedStatement pstmt = null ;

  ResultSet rs = null ;

  boolean flag = false ; // 表示登陆成功或失败的标记

%>

<%

     String action = request.getParameter("username");

     if(action!=null){

    %>

     <%out.println(request.getParameter("password")); %>

    <% 

String name = request.getParameter("username") ; // 接收表单参数

String password = request.getParameter("password") ; // 接收表单参数

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

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

try{

  Class.forName(DBDRIVER) ;

  conn = DriverManager.getConnection(DBURL) ;

  String sql = "INSERT INTO user (name, password) VALUES (?,?)";

  pstmt = conn.prepareStatement(sql) ;

  pstmt.setString(1,name) ;

  pstmt.setString(2,password) ;

  int sql_update = pstmt.executeUpdate();

 if(sql_update>0){

 flag=true;

 }

}catch(Exception e){

}finally{

 try{

  conn.close() ; // 连接一关闭，所有的操作都将关闭

 }catch(Exception e){}

}

%>

<%

if(flag){

request.getSession().setAttribute("success", "注册");

%>

<%

}else{  // 登陆失败，跳转到failure.jsp

request.getSession().setAttribute("error", "注册");

%> 

<%

}

     }else{}

%>

   

登录失败代码:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

   

    ${sessionScope.error }失败

登陆成功代码：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

   

   ${sessionScope.success }成功！

数据库表：

Source Server         : localhost_3306

Source Server Version : 50528

Source Host           : localhost:3306

Source Database       : bbs

Target Server Type    : MYSQL

Target Server Version : 50528

File Encoding         : 65001

Date: 2016-06-04 09:25:01

*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------

-- Table structure for tb_user

-- ----------------------------

DROP TABLE IF EXISTS `tb_user`;

CREATE TABLE `tb_user` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `username` varchar(255) NOT NULL,

  `password` varchar(255) NOT NULL,

  `linkman` varchar(255) DEFAULT NULL,

  `company` varchar(255) DEFAULT NULL,

  `companytel` varchar(255) DEFAULT NULL,

  `qq` varchar(255) DEFAULT NULL,

  PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

-- ----------------------------

-- Records of tb_user

-- ----------------------------

INSERT INTO `tb_user` VALUES ('1', 'admin', 'admin', null, null, null, null);

INSERT INTO `tb_user` VALUES ('2', 'user', 'user', null, null, null, null);