本文實(shí)例講述了jsp+jdbc實(shí)現(xiàn)連接數(shù)據(jù)庫(kù)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(shū)上的例子折騰了半天，就是連不上數(shù)據(jù)庫(kù)。于是在網(wǎng)上找材料，終于發(fā)現(xiàn)，老的jar包與新版數(shù)據(jù)庫(kù)直接不兼容。于是下了新的數(shù)據(jù)庫(kù)jdbc包，試了一下，果然搞定。這里，把這個(gè)程序跟大家共享下，程序?qū)崿F(xiàn)了網(wǎng)頁(yè)登錄界面上提取用戶名與密碼，然后與數(shù)據(jù)庫(kù)中用戶名密碼對(duì)應(yīng)，從而決定程序是否通過(guò)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>
welcomebr>
/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(cè)新用戶/a>/td>
/tr>
/table>
/form>
程序使用tomcat進(jìn)行發(fā)布，myeclipse進(jìn)行編輯和調(diào)試
希望本文所述對(duì)大家的jsp程序設(shè)計(jì)有所幫助。
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