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eclipse连接数据库
文章目录 MySQL配置环境变量navicat部署tomcat导入驱动修改代码连接mysql数据库运行：
MySQL配置环境变量
mysql肯定是必不可少的，这个就不用多说了，自己去官网下载就行我们来配置一下mysql的环境变量
步骤：
我的电脑右键——属性——高级系统——环境变量
在系统变量下点击新建：
变量名：MYSQL_HOME
变量值：C:\phpStudy\PHPTutorial\MySQL
这里的变量值填的是自己mysql所在的文件夹，以自己电脑路径为准
然后找到path，点击编辑，然后新建一个
%MYSQL_HOME%\bin
点击确定（共三个）
测试
在windows命令行下输入
mysql -u root -p
按下回车，输入密码即可进入数据库
navicat
我自己电脑用的是phpstudy，感觉更方便一点，集成环境，并且有可视化工具，这里推荐使用navicat（有破解教程）
链接: https://pan.baidu.com/s/1dpNhsSUy_yAw-qi63toSzQ
提取码: wumm
部署tomcat
我们点击菜单栏windows>>preference>>在左边栏找到server>>Runtime Environme
点击add，添加tomcat
选择需要的版本，点击next,选择自己安装的tomcat路径
点击finish：
tomcat版本不要太高，不然可能会出现报错；
新建一个web项目
其他选择默认，next>>next>>next>>finish
将tomcat服务器显示在控制台上，以及将web应用部署到tomcat中
1、window>>show view>>servers
2、点击控制台链接：No servers are available. Click ths link to create a new server.
3、在弹出的对话框中选择tomcat版本
4、点击next，添加我们的项目：选中我们的项目，点击add，finish。
我们会在右边菜单栏看到文件夹servers，里边就是tomcat的一些相关文件
右键面板中的tomcat v8.0…点击start，开启服务器即可
导入驱动
导入的驱动一定不能过高，最好和自己电脑mysql版本一致
我电脑上的mysql是5.5.53，用的驱动是5.1.47，可用！
链接: https://pan.baidu.com/s/1senUiVzre2B7It-TIdjO5w
提取码: 5ksf
下载好解压，直接将jar包拖入lib中，右键build path一下
这样就是导入成功！
修改代码
找到我们创建的inc.jsp，修改下列代码，以自己电脑为准，这个是和代码相匹配的
另外，所有web文件都要放在WEB-INF下
连接mysql数据库
连接名随意，默认端口为3306
在数据库中我们要创建一个数据库库名为demo，表名为users，
添加字段：username、password、email
这就相当于登陆的用户名和密码，可直接在数据库中添加，也可通过注册界面
填写注册信息，同样会显示在数据库中
运行：
（1）login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<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="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
-->
</head>
<body>
<form name="form1" action="login_action.jsp" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">登录窗口</td>
<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" rel="external nofollow" >注册新用户</a></td>
</tr>
</table>
</form>
</body>
</html>
（2）login_action.jsp
<%@ page pageEncoding="utf-8" %>
<%@ include file="inc.jsp"%>
<%
//get parameters
String username = request.getParameter("username");
String password = request.getParameter("password");
//check null
if (username == null || password == null) {
response.sendRedirect("login.jsp");
}
//validate
boolean isValid = false;
String sql = "select * from users where username='"+username+"' and password='"+password+"'";
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);
} finally {
}
if (isValid) {
session.setAttribute("username", username);
response.sendRedirect("welcome.jsp");
} else {
response.sendRedirect("login.jsp");
}
%>
（3）register.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<title>My JSP 'register.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
-->
</head>
<body>
<form name="form1" action="register_action.jsp" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">注册窗口</td>
<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="password1" size="10"></td>
</tr>
<tr>
<td>确认密码</td>
<td><input type="password" name="password2" size="10"></td>
</tr>
<tr>
<td>Email</td>
<td><input type="text" name="email" size="10"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="注册"> <a
href="login.jsp" rel="external nofollow" >返回</a></td>
</tr>
</table>
</form>
</body>
</html>
（4）register_action.jsp
<%@ page pageEncoding="utf-8" %>
<%@ include file="inc.jsp"%>
<%
//get parameters
String username = request.getParameter("username");
String password1 = request.getParameter("password1");
String password2 = request.getParameter("password2");
String email = request.getParameter("email");
//check null
if (username == null || password1 == null || password2 == null || !password1.equals(password2)) {
response.sendRedirect("register.jsp");
}
//validate
boolean isValid = false;
String sql = "select * from users where username='"+username+"'";
try {
Class.forName(drv).newInstance();
Connection conn = DriverManager.getConnection(url, usr, pwd);
Statement stm = conn.createStatement();
ResultSet rs = stm.executeQuery(sql);
if(!rs.next()) {
sql = "insert into users(username,password,email) values('"+username+"','"+password1+"','"+email+"')";
stm.execute(sql);
isValid = true;
}
rs.close();
stm.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
out.println(e);
}
if (isValid) {
response.sendRedirect("login.jsp");
} else {
response.sendRedirect("register.jsp");
}
%>
（5）welcome.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<title>My JSP 'welcome.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
-->
<style type="text/css">
body{
background-color: beige;
}
</style>
</head>
<body>
<table width="100%">
<tr>
<td><img src="images/111.jpgA,LDYVS." height="90"></td>
</tr>
<tr>
<td colspan="2">
<hr>
</td>
</tr>
<tr>
<td>
<table>
<tr>
<td><a href="welcome.jsp" rel="external nofollow" >Main</a></td>
</tr>
<tr>
<td><a href="menu1.jsp" rel="external nofollow" >Menu1</a></td>
</tr>
<tr>
<td><a href="menu2.jsp" rel="external nofollow" >Menu2</a></td>
</tr>
<tr>
<td><a href="menu3.jsp" rel="external nofollow" >Menu3</a></td>
</tr>
<tr>
<td><a href="menu4.jsp" rel="external nofollow" >Menu4</a></td>
</tr>
<tr>
<td><a href="menu5.jsp" rel="external nofollow" >Menu5</a></td>
</tr>
<tr>
<td><a href="menu6.jsp" rel="external nofollow" >Menu6</a></td>
</tr>
<tr>
<td><a href="menu7.jsp" rel="external nofollow" >Menu7</a></td>
</tr>
<tr>
<td><a href="menu8.jsp" rel="external nofollow" >Menu8</a></td>
</tr>
</table>
</td>
<td>
<form name="form1" action="logout.jsp" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">登录成功</td>
<tr>
<td>欢迎你，</td>
<td><%=(String) session.getAttribute("username")%></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="退出"></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
</body>
</html>
（6）logout.jsp
<%
session.removeAttribute("username");
response.sendRedirect("login.jsp");
%>
（7）inc.jsp
<%@ 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.microsoft.sqlserver.jdbc.SQLServerDriver";
String url = "jdbc:sqlserver://localhost:1433;DatabaseName=Demo";
String usr = "sa";
String pwd = "";
%>
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