首先在此之前我们应该正确安装数据库，以及eclipse（javaee）文件包。
1.首先在javaee中建立新的项目
2.右键点击WebContent-New-JSP File，新建jsp(动态)文件。（想在哪个文件夹里添加jsp文件，就直接右击文件夹新建，注意一定不要展开文件夹，否则容易出现路径不正确的问题）
3.进行页面的编写
login.jsp
logincheck.jsp
<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8"
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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<jsp:useBean id="db" class="Bean.DBBean" scope="page" />
<%
request.setCharacterEncoding("UTF-8");
String username=(String)request.getParameter("username");
String password=(String)request.getParameter("password");//取出login.jsp的值 //下面是数据库操作
String sql="select * from Table_1 where name="+"'"+username+"'";//定义一个查询语句
ResultSet rs=db.executeQuery(sql);//运行上面的语句
if(rs.next())
{
/* if(password.equals(rs.getString(2)))
{ } */
if(password.equals(rs.getObject("password"))){
response.sendRedirect("loginsuccess.jsp");
}
else{
out.print("<script language='javaScript'> alert('密码错误');</script>");
response.setHeader("refresh", "0;url=login.jsp");
}
}
else
{
out.print("<script language='javaScript'> alert('账号错误——else');</script>");
response.setHeader("refresh", "0;url=login.jsp");
} %>
</body>
</html>
loginsuccess.jsp
<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8"
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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>登录成功 </h1>
</body>
</html>
创建DBBean.java,连接数据库
package Bean;
import java.sql.*;
public class DBBean {
private String driverStr = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
private String connStr = "jdbc:sqlserver://localhost:1433; DatabaseName=z";
private String dbusername = "ZH";
private String dbpassword = "123";
private Connection conn = null;
private Statement stmt = null; public DBBean()
{
try
{
Class.forName(driverStr);
conn = DriverManager.getConnection(connStr, dbusername, dbpassword);
stmt = conn.createStatement();
}
catch (Exception ex) {
System.out.println("数据连接失败！");
} } public int executeUpdate(String s) {
int result = 0;
System.out.println("--更新语句:"+s+"\n");
try {
result = stmt.executeUpdate(s);
} catch (Exception ex) {
System.out.println("执行更新错误！");
}
return result;
} public ResultSet executeQuery(String s) {
ResultSet rs = null;
System.out.print("--查询语句:"+s+"\n");
try {
rs = stmt.executeQuery(s);
} catch (Exception ex) {
System.out.println("ִ执行查询错误！");
}
return rs;
}
public void execQuery(String s){
try {
stmt.executeUpdate(s);
} catch (SQLException e) {
// TODO Auto-generated catch block
System.out.println("执行插入错误！");
}
} public void close() {
try {
stmt.close();
conn.close();
} catch (Exception e) {
}
}
}
4.进行程序执行，最后登录成功！