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连接oracle数据库，新建用户登录界面

發布時間：2024/4/15 数据库 49 豆豆

生活随笔收集整理的這篇文章主要介紹了连接oracle数据库，新建用户登录界面小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

一.下載jar包

下載oracle驅動包：ojdbc6.jar，放于如下位置：

測試代碼：

package com.test;import java.sql.Connection; import java.sql.DriverManager;import org.junit.Test;public class Test01 {@Testpublic void test() {try {Class.forName("oracle.jdbc.driver.OracleDriver");Connection conn = null;//orcl 是數據庫名；test123是用戶名；qwer1234是密碼conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "test123","qwer1234");} catch (Exception e) {e.printStackTrace();}} }

運行成功就算連接成功了，之后就可以操作數據庫了。
參考地址：https://blog.csdn.net/he__xu/article/details/83410966
jar包下載鏈接：https://pan.baidu.com/s/1j2lV7uJWsgmW0yym9j8jHw 提取碼：0mqk

二、使用spring框架：

1.需要下載：

commons-dbcp jar包：
下載地址：http://commons.apache.org/proper/commons-dbcp/download_dbcp.cgi
鏈接：https://pan.baidu.com/s/1BsbXz1FG4FQi4-ZSIWnYhQ 提取碼：d3uo
commons-pool jar包：
下載地址：http://commons.apache.org/proper/commons-pool/download_pool.cgi
鏈接：https://pan.baidu.com/s/1LTK2WQ1CIsIglYqVZBr6ig 提取碼：38v8
鏈接：https://pan.baidu.com/s/1O6cI7FOtlMYyzzYDX4phcQ 提取碼：b3sn

2.web.xml配置：

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"><property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/><property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/><property name="username" value="test123"/><property name="password" value="qwer1234"/><property name="initialSize" value="3" /><property name="maxActive" value="300" /><property name="maxIdle" value="2" /><property name="minIdle" value="1" /> </bean>

3.測試代碼：

@Testpublic void test() {ApplicationContext ctx = new ClassPathXmlApplicationContext("resource/applicationContext.xml");}

備注：如果有以下報錯：
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource': Failed to introspect bean class [org.apache.commons.dbcp.BasicDataSource] for lookup method metadata: could not find class that it depends on; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool/ObjectPool
可以把commons-pool2-2.4.3.jar需要換成commons-pool-1.6.jar

三、調用測試：

代碼：

public void test() {ApplicationContext ctx = new ClassPathXmlApplicationContext("resource/applicationContext.xml");BasicDataSource dataSource = (BasicDataSource) ctx.getBean("dataSource"); }

解決：在aop后面添加一個屬性：proxy-target-class="true"

測試通過后直接試著調用一下
代碼：

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {ApplicationContext ctx = new ClassPathXmlApplicationContext("resource/applicationContext.xml");BasicDataSource dataSource = (BasicDataSource) ctx.getBean("dataSource");String msg = "";Statement st = null;ResultSet rs = null;try {// 1、獲取連接對象Connection conn = dataSource.getConnection();// 2、創建statement類對象，用來執行SQL語句！！st = conn.createStatement();// 3、創建sql查詢語句String sql = "select * from sys_user ";// 4、執行sql語句并且換回一個查詢的結果集rs = st.executeQuery(sql);while (rs.next()) { // 循環遍歷結果集int id = rs.getInt("user_id");String name = rs.getString("real_name");msg += "id=" + id + "--" + "name=" + name+"<br>";}} catch (SQLException e) {e.printStackTrace();}response.setCharacterEncoding("UTF-8");response.setContentType("text/html");PrintWriter out = response.getWriter();out.println("<html><head><title>一二零叁的網站</title></head><body>");out.print(msg);out.print("</body></html>");}

其中用戶表：

結果：

四、使用配置文件

1.jdbc.properties:

jdbc.driver=oracle.jdbc.driver.OracleDriver jdbc.url=jdbc:oracle:thin:@localhost:1521:orcl jdbc.username=test123 jdbc.password=qwer1234

2.web.xml改為：

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:resource/jdbc.properties</value> </list> </property> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"><property name="driverClassName" value="${jdbc.driver}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/><property name="initialSize" value="3" /><property name="maxActive" value="300" /><property name="maxIdle" value="2" /><property name="minIdle" value="1" /> </bean>

這樣就可以了。

五、簡單的用戶登錄

1.登錄界面login.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>一二零叁的網站</title> <script type="text/javascript"> function zhuce(){alert("跳轉到注冊界面......"); } </script> </head> <body><center><h1 style="color:#7D26CD">登錄</h1><hr style="width:85%"><form id="indexform" name="indexForm" action="logincheck.jsp"method="post"><table border="0"><tr><td>賬號：</td><td colspan="2"><input type="text" name="username"></td></tr><tr><td>密碼：</td><td colspan="2"><input type="password" name="password"></td></tr><tr><td colspan="3" align="center"><br> <input type="submit" value="登錄" style="color:#BC8F8F">    <input type="button" onclick="zhuce()" value="注冊" style="color:#BC8F8F"></td></tr></table></form></center> </body> </html>

2.登錄驗證：logincheck.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ page import="java.lang.*"%> <%@ page import="com.service.Login"%> <%@ page import="net.sf.json.JSONObject"%><%try {request.setCharacterEncoding("UTF-8");String username = (String) request.getParameter("username");String password = (String) request.getParameter("password");//取出login.jsp的值Login login = new Login();JSONObject loginResult = login.checkLogin(username, password);if (1 == loginResult.getInt("status")) {response.sendRedirect("../IndexServlet");} else {out.print("<script language='javaScript'> alert('"+ loginResult.getString("msg") + "');</script>");response.setHeader("refresh", "0;url=login.jsp");}} catch (Exception e) {e.printStackTrace();} %>

3.用戶驗證Login.java:

package com.service;import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException;import net.sf.json.JSONObject;import org.apache.commons.dbcp.BasicDataSource; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class Login {public JSONObject checkLogin(String username,String password){JSONObject result = new JSONObject();ApplicationContext ctx = new ClassPathXmlApplicationContext("resource/applicationContext.xml");BasicDataSource dataSource = (BasicDataSource) ctx.getBean("dataSource");PreparedStatement ps =null;try {// 1、獲取連接對象Connection conn = dataSource.getConnection();// 2、創建statement類對象，用來執行SQL語句！！ps = conn.prepareStatement("select password,enabled from sys_user where user_name = ? ");// 3、創建sql查詢語句ps.setString(1, username);// 4、執行sql語句并且換回一個查詢的結果集ResultSet rs = ps.executeQuery();if (rs.next()) { // 有查詢結果if(!password.equals(rs.getString("password"))){result.put("status", "3");result.put("msg", "密碼錯誤");} else if(1!=rs.getInt("enabled")){result.put("status", "4");result.put("msg", "改賬號不允許登錄");} else {result.put("status", "1");result.put("msg", "允許登錄");}} else {result.put("status", "2");result.put("msg", "不存在該賬號");}} catch (SQLException e) {e.printStackTrace();}return result;}}

4.結果：

登錄界面:

登錄失敗：

登錄成功：

轉載于:https://www.cnblogs.com/GodSince/p/11242662.html

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