jsp实现登录注册（与数据库对接）

最近做了一些图像处理的内容，闲暇时间搞了下jsp，终于把至少两个月之前的代码的bug找出来了...

具体内容我在之前一篇博文有介绍，主要是增加了数据库的部分。其实一样处理，获得输入的用户名，密码，然后判断是否需要在当前页面用javascipt处理下（比如注册肯定是需要的,起码两次密码输的要一样），然后跳转逻辑页面，对接数据库，进行增删查改，最后跳转相应的页面.

有几点需要注意:1,myeclipse的导入jar的包与eclipse稍有不同.

                             2,javascript处理和跳转逻辑页面的处理的区别

之后有空再用javabean重写一遍.

login.jsp

<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8"%>








  
用户登录
  
用户名:

  
密码:

  

  

  如果您还没有注册，请单击这里注册！

register.jsp

<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
    
	
	
	    
	
	
	
  

 
  
  
   
  
用户注册
  


  
用户名:

  
输入密码:

  
再次确认密码:

  

  

  
   

  

check.jsp(判断用户登录）

<%@ page language="java" import="java.sql.*" contentType="text/html;charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


  
    
    
    
	
	    
	
	
	
 
  
<%
   request.setCharacterEncoding("utf-8");
   String users=request.getParameter("username");
   String pass=request.getParameter("pwd");
   boolean flag=false;
   PreparedStatement sql=null;  
   ResultSet rs=null;
   Connection conn=null;
%>

<% 
    String driver = "com.mysql.jdbc.Driver";  
    String url = "jdbc:mysql://127.0.0.1:3307/login";  
    String use = "root";   
    String password = "960404";  
    Class.forName(driver);  
    conn= DriverManager.getConnection(url,use,password);  
    sql =conn.prepareStatement("select * from student where username=? and password=?");
    sql.setString(1,users);
    sql.setString(2,pass);
    rs=sql.executeQuery();
    if (rs.next()) {  
    flag=true;
     }
   rs.close();
   sql.close();
   conn.close();
  %>

<% if (flag==true){ %>

<%} 
else
if (flag==false){
%>

<%} %>

check2.jsp（判断用户注册）

<%@ page language="java" import="java.sql.*" contentType="text/html;charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
    
	
	    
	
	
	

  
  
  
    

   <%
   request.setCharacterEncoding("utf-8");
   String users=request.getParameter("username");
   String pass=request.getParameter("pwd");
   %>
   <% 
    String driver = "com.mysql.jdbc.Driver";  
    String url = "jdbc:mysql://127.0.0.1:3307/login";  
    String use = "root";   
    String password = "960404";  
    Class.forName(driver);  
    Connection conn= DriverManager.getConnection(url,use,password);  
    PreparedStatement sql =conn.prepareStatement("insert into student(username,password)values(?,?)");
    sql.setString(1,users);
    sql.setString(2,pass); 
    int rtn=sql.executeUpdate();
    sql.close();
    conn.close();
    %>
    
  

show.jsp(登录成功)

<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
	
	    
	
	
	

  
  
  
   登录成功. 

  

login_fail.jsp(注意还是要跳转回原来的登录页面的)

<%@ page language="java" import="java.sql.*" contentType="text/html;charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
    
	
	
	    
	
	
	

  
  
  
  <% out.println("登录失败");%> 
  <% response.setHeader("refresh","5;url=login.jsp");%>