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jsp+jdbc实现连接数据库的方法

作者:xiaosong  日期:06-25

本文实例讲述了jsp+jdbc实现连接数据库的方法。分享给大家供大家参考。具体如下:

初次尝试JSP+jdbc,按照书上的例子折腾了半天,就是连不上数据库。于是在网上找材料,终于发现,老的jar包与新版数据库直接不兼容。于是下了新的数据库jdbc包,试了一下,果然搞定。这里,把这个程序跟大家共享下,程序实现了网页登录界面上提取用户名与密码,然后与数据库中用户名密码对应,从而决定程序是否通过登录。

inc.jsp文件:

<%@ page import="java.sql.Connection"%><%@ page import="java.sql.DriverManager"%><%@ page import="java.sql.Statement"%><%@ page import="java.sql.ResultSet"%><%@ page import="java.sql.ResultSetMetaData"%><%String drv = "com.mysql.jdbc.Driver";String url = "jdbc:mysql://localhost:3306/demo";String usr = "nari";String pwd = "nari";%>

welcome.jsp文件:

<html> <body> welcome<br> </body></html>

login_action.jsp文件:

<%@ include file="inc.jsp" %><%String username = request.getParameter("username");String password = request.getParameter("password");if(username == null || password == null){ response.sendRedirect("index.jsp");}boolean isValid = false;String sql = "select * from user where username='"+username+"'and password='"+password+"'";out.println("===>"+sql);try{ Class.forName(drv).newInstance(); Connection conn = DriverManager.getConnection(url, usr,pwd); Statement stm = conn.createStatement(); ResultSet rs = stm.executeQuery(sql); if(rs.next())isValid = true; rs.close(); stm.close(); conn.close();}catch(Exception e){ e.printStackTrace(); out.println(e);}if(isValid){ response.sendRedirect("welcome.jsp");}else response.sendRedirect("index.jsp");%><% /*if(username.endsWith("a"))response.sendRedirect("welcome.jsp");else response.sendRedirect("index.jsp");*/%>

index.jsp文件:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html> <head> <base href="<%=basePath %>"/> <title>My JSP 'login.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="description" content="This is my page"> </head> <body> miThis is my JSP page.<br> </body></html> <form name="form1" action="login_action.jsp" method="post"><table width="200"><tr> <td colspan="2">登录窗口</td></tr><tr> <td>用户名</td> <td><input type="text" name="username" size="10"/></td></tr><tr> <td>密码</td> <td><input type ="password" name="password" size="10"/></td></tr><tr> <td colspan="2"><input type="submit" name="submit" value="登录"> <a href="register.jsp">注册新用户</a></td></tr></table></form>

程序使用tomcat进行发布,myeclipse进行编辑和调试

希望本文所述对大家的jsp程序设计有所帮助。

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