本文實例講述了jsp+jdbc實現連接數據庫的方法。分享給大家供大家參考。具體如下：
初次嘗試JSP+jdbc，按照書上的例子折騰了半天，就是連不上數據庫。于是在網上找材料，終于發現，老的jar包與新版數據庫直接不兼容。于是下了新的數據庫jdbc包，試了一下，果然搞定。這里，把這個程序跟大家共享下，程序實現了網頁登錄界面上提取用戶名與密碼，然后與數據庫中用戶名密碼對應，從而決定程序是否通過登錄。
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" border="1"><tr> <td colspan="2">登錄窗口</td></tr><tr> <td>用戶名</td> <td><input type="text" name="username" size="10"/></td></tr><tr> <td>密碼</td> <td><input type ="password" name="password" size="10"/></td></tr><tr> <td colspan="2"><input type="submit" name="submit" value="登錄"> <a href="register.jsp">注冊新用戶</a></td></tr></table></form>
程序使用tomcat進行發布，myeclipse進行編輯和調試
希望本文所述對大家的jsp程序設計有所幫助。
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