JSP实现登录注册并链接数据库页面

        在学习了页面跳转及部分知识后做了登录注册界面，并经过本博主调试bug后完善的更进一步，大家有什么问题也可以留言，本博主以更广泛学习讨论为目的。

        内容介绍：实现页面的跳转；注册登录时实现读取数据库，并对数据库实现插入(insert)和查询(select)功能。

        几点注意：sqljdbc.jar包的导入和环境变量；数据库的登录读取，可以参考数据库的测试。

登录注册界面的代码实现

index.jsp

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



  
    
    
    
	
	
	    
	
	
	
  
  
    
    欢迎使用飞龙科技

    

        
    
    
  
  

login.jsp  //登录界面

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



  
    
    
    
    
	
	
	    
	
	
	

  
    
  	登录界面
  	<%  
    String flag = request.getParameter("errNo");  
    try{
         if(flag!=null)
            out.println("用户名不存在或密码错误");
    }catch(Exception e){
        e.printStackTrace();
    }
   %>
  	

      
 
 		

 		  
账  户：
 		  

 	    
 	    

 		  
密  码：
 		  

 	    
 	    

 	      

 		    
 		    
 	      
 	    
 	  
 	
  
  

loginCh.jsp  //登录检验

<%@ page language="java" import="java.util.*,java.sql.*,java.net.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


  
    
    
    
    
	
	
	    
	
	
	

  
  
    <%      //接收用户名和密码  
            String user = new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");  
            String pwd = request.getParameter("pwd");

            String driverClass = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
            String url = "jdbc:sqlserver://localhost:1433; DatabaseName = db_01";
            String username = "sa";
            String password = "123";
            Class.forName(driverClass);//加载驱动 
            Connection conn = DriverManager.getConnection(url,username,password);//得到连接
            PreparedStatement pStmt = conn.prepareStatement("select * from tb_user where UName = '" + user + "' and Pwd = '" + pwd + "'");
              ResultSet rs = pStmt.executeQuery();
                if(rs.next()){
                    response.sendRedirect("success.jsp?username="+URLEncoder.encode(user)); //解决乱码 
                }else{
                    response.sendRedirect("login.jsp?errNo");//密码不对返回到登陆  
                }
     rs.close();
     pStmt.close();
     conn.close();
     %>
  

success.jsp  //登录成功界面

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



  
    
    
	
	
	    
	
	
	
  
  
    
    <%
     String name = new String(request.getParameter("username").getBytes("8859_1"));
     out.println("欢迎你:" + name);
    %>

    重新登陆
    
  

register.jsp  //注册界面

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


  
    
    
	
	
	    
	
	
	
    
  
    
	注册界面
	

  	

  	  

		
用户名：
		

 	  
 	  

 		
输入密码：
 		

 	  
 	  

 		
确认密码：
 		

 	  
	  

 		

 		      
 		  
 		
	  
	
    
    
  

checkRegister.jsp //验证注册用户并导入数据库

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



  
    
    
    
    
	
	
	    
	
	
	

  
  
    <%      
            String user = new String(request.getParameter("username").getBytes("ISO-8859-1"),"UTF-8");  
            String pwd = request.getParameter("password");

            String driverClass = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
            String url = "jdbc:sqlserver://localhost:1433; DatabaseName = db_01";
            String username = "sa";
            String password = "123";
            Class.forName(driverClass);//加载驱动 
            Connection conn = DriverManager.getConnection(url,username,password);//得到连接
            PreparedStatement pStmt = conn.prepareStatement("select * from tb_user where UName = '" + user + "'");
              ResultSet rs = pStmt.executeQuery();
                if(rs.next()){
                    out.println("");
                }else{
                    PreparedStatement tmt = conn.prepareStatement("Insert into tb_user values('" + user + "','" + pwd + "')");
                        int rst = tmt.executeUpdate();
                        if (rst != 0){
                              out.println("");  
                        }else{
                           out.println("");  
                        }
                }
     %>
  

以上代码若有问题，首先执行下面数据库的测试代码：

执行下面代码前，首先在数据库中创建名为‘db_01’的数据库，在表中创建名为‘user’的表

login1.jsp

<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
    
	
	
	    
	
	
	

  
  
    <%
    String driverClass = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    String url = "jdbc:sqlserver://localhost:1433; DatabaseName = db_01";
    String username = "sa";
    String password = "123";
    Class.forName(driverClass);//这步错可能是因为.jar包导入问题
    Connection conn = DriverManager.getConnection(url,username,password);//这步错可能是因为数据库属性安全中的名、密码不对或SQL的IP端口不是‘1433’
    PreparedStatement pStmt = conn.prepareStatement("select * from tb_user");
           ResultSet rs = pStmt.executeQuery();
                while(rs.next()){
                      out.println("用户名： " + rs.getString(1) 
                             + " 密码： " + rs.getString(2));
                }
     rs.close();
     pStmt.close();
     conn.close();
     %>
  

小人团队.jpg

以上代码都是经过本博主细心敲打修改并实现的。转载请注明本博客的地址。