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+"
");
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+"
");
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！