使用myeclipse与SQLyog怎么建立简单的登陆页面

事先先在sqlyog中新建一个数据库，然后建一个表，

然后使用myeclipse新建一个Web service project，分别建立四个包，cn.edu.hpu.service,

                 cn.edu.hpu.servlet,

                 cn.edu.hpu.test,

                 cn.edu.hpu.util,

然后在第一个包中建立一个对象，

 代码如下：

<span style="font-size:18px;">package cn.edu.hpu.model;

public class user {
      private String name;
      private String password;
      private int code;
      
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public int getCode() {
		return code;
	}
	public void setCode(int code) {
		this.code = code;
	}
      
}
</span>

<span style="font-size:18px;">
</span>

<span style="font-size:18px;">在第二个包中：</span>

<span style="font-size:18px;">
</span>

package cn.edu.hpu.service;

import cn.edu.hpu.model.user;

public interface UserManager {
	
      public boolean add(user u);
      public boolean checkLogin(String name,String password);
}

package cn.edu.hpu.service;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;

import cn.edu.hpu.model.user;
import cn.edu.hpu.util.DBO;

public class UserManagerImpl implements UserManager{
   public boolean add(user u){
	   boolean flag = false;
	   
	   Connection conn=null;
	   PreparedStatement pst=null;
	   try{
		   conn=DBO.getConnection();
		   String sql="insert into login_ (name,password,code) value(?,?,?)";
           pst=conn.prepareStatement(sql);
           
           pst.setString(1,u.getName());
           pst.setString(2, u.getPassword());
           pst.setInt(3, u.getCode());
           
           int rows = pst.executeUpdate();
           if(rows > 0){
        	   flag = true;
        	   
           }          
	   }catch(Exception ex){
		   ex.printStackTrace();
	   }finally{
		   DBO.close(pst,conn);
	   }
	   return flag;
   }
   public boolean checkLogin(String name,String password){
	   boolean flag = false;
	   Connection conn = null;
	   Statement st = null;
	
	   ResultSet rs = null;
   
	   try{
		   conn = DBO.getConnection();
		   st = conn.createStatement();
		  String sql = "select * from login_ where name=" + name;
		  rs = st.executeQuery(sql);
		  
		  while(rs.next()){
			  if(rs.getString("password").equals(password)){
				  flag=true;
			  }
		  }
	   }catch(Exception e){
		   e.printStackTrace();
	   }finally{
	        DBO.close(rs,st,conn);	   
	   }
	   return flag;
   }
}	 

第三个包中未测试数据所用：

package cn.edu.hpu.test;

import java.sql.Connection;
import java.util.Scanner;
import cn.edu.hpu.model.user;
import cn.edu.hpu.service.UserManager;
import cn.edu.hpu.service.UserManagerImpl;
import cn.edu.hpu.util.DBO;

public class test {
     public static void main(String[] args) {
    	 Scanner input = new Scanner(System.in);
		Connection conn = DBO.getConnection();
		if(conn != null)
			System.out.println("Connection success");
		UserManager um = new UserManagerImpl();
		for(int i = 100;i<105;i++){
			user u =new user();
			System.out.println("输入一个字符串：");
			String ch = input.nextLine();
			u.setName(ch);
			u.setPassword("pwd" + i);
			u.setCode(i + 1);
			boolean flag = um.add(u);
		}
	}
}

第四个包为连接数据库所用：

package cn.edu.hpu.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBO {
     private static String driver = "com.mysql.jdbc.Driver";
     
     private static String url = "jdbc:mysql://localhost:3306/login_plus";
     private static String username = "root";
     private static final String password = "123";
    static{
    	try{
    		Class.forName(driver);
    	} catch(ClassNotFoundException e){
    		e.printStackTrace();
    	}
    }
    public static Connection getConnection(){
    	Connection conn = null;
    	try{
    		conn = DriverManager.getConnection(url,username,password);
    	}catch(SQLException e){
    		e.printStackTrace();
    	}
    	return conn;
    }
    public static void close(ResultSet rs,Statement st,Connection conn){
    	try{
    		if(rs != null){
    			rs.close();
    		}
    		if(st != null){
    			st.close();
    		}
    		if(conn != null){
    			conn.close();
    		}
    	}catch(SQLException e){
    		e.printStackTrace();
    	}
    }
    public static void close(Statement st, Connection conn){
    	close(null,st,conn);
    }
}
	
	

然后在webroot下新建jsp文件，第一个为主页面：index.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">
	-->
	<style>
section{
      background-color:#C9E495;
	  width:360px;
	  height:280px;
	  text-align:center;
	  padding-top:1px;
	  margin-top:156px;
}
.textBaroder{
      border-width:1px;
	  border-style:solid;
}
</style>
  </head>
  
  <center><body>
  <section>
    <form action="addm" method="post" align="center">
    	<center><h1>用户信息管理系统</h1></center>
    	<b>用户名：</b><input class="textBaroder" type="text" name="Name"><br>
    	<p></p>
    	<b>密  码：</b><input class="textBaroder" type="password" name="Password"><br>
    
        <font  size="+1"  >
        <p>      
            <input class="textBaroder" name="submit"  class="textBaroder" type="submit" class="button"  style="width:200px; height:35px " value="登录" />
        </p>
          <p><font  size="-1"  color="#000099">     忘记密码？</font>             <font  size="-1"  color="#000099"><a href="register.jsp">新用户</a> </font> </p>
          </font>
    	
    	</form>
 </section>
  </body></center>
</html>

然后为简单的注册页面：register.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 'register.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">
	-->
 <style>
section{
      background-color:green;
	  width:360px;
	  height:280px;
	  text-align:center;
	  padding-top:1px;
	  margin-top:156px;
}
.textBaroder{
      border-width:1px;
	  border-style:solid;
}
</style>
  </head>
  
  <center><section><body>
    <h1 align="center">注册新用户</h1>
 	<hr/>
    <form action="add" method="post" align="center" >
	           用户名:<input class="textBaroder" name="name" type="text"/><br/>
	    <p></p>
	          密 码:<input name="password" class="textBaroder" type="password"/><br/>
	    <p></p>
	          验证码:<input name="code" class="textBaroder" type="text"><br/>
	    <p></p>
  	<input type="submit" style="width:80px; height:35px "value="注册" /> 
    </form>
    	<a href="index.jsp">返回 </a>
  </body></section></center>
</html>

这对一个刚接触Javaweb的小白是多么的重要啊，忽然之间感觉自己学的好充实，