欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  Java

jsp里怎么写登录界面

程序员文章站 2022-03-22 10:33:58
...
此次试验所用到的软件是myeclipse10,tomcat7,Dreamweaver,sqlserver2008数据库。可以实现用户使用用户名和密码登录。

推荐课程:Java教程

jsp里怎么写登录界面

如果登录成功,页面会显示登录成功,如果密码错误,则页面会显示登录失败。连接数据库使用的事javabean方法,需要实现下载好sqlserver2008的驱动程序,在web project文件夹下的src文件夹下新建包“Bean”,并在此包下新建“DBBean.java”文件。

DBBean.java文件代码如下:

package Bean;
import java.sql.*;
public class DBBean {
    private String driverStr = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
    private String connStr = "jdbc:sqlserver://localhost:1433; DatabaseName=JXP";
    private String dbusername = "sa";
    private String dbpassword = "123456";
    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) {
        }
    }
}

在WEBROOT目录下有三个jsp页面文件:分别是login.jsp,logincheck.jsp,loginsuccess.jsp.在login.jsp页面中,可以通过输入用户名、密码,点击登录按钮,实现登录成功loginsucccess.jsp页面的跳转,如果密码错误,则页面会跳转到登录失败的页面。(当然,在进行页面跳转之前,需要在sqlserver2008中新建一个数据库,在数据库目录下新建一个表,并填入表的信息)

文件夹结构截图:

jsp里怎么写登录界面

login.jsp登录界面代码:

<%@ 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=utf-8">
<title>登录界面</title>
</head>
<body>
    <center>
        <h1 style="color:red">登录</h1>
            <form id="indexform" name="indexForm" action="logincheck.jsp" method="post">
                <table border="0">
                    <tr>
                        <td>账号:</td>
                        <td><input type="text" name="username"></td>
                    </tr>
                    <tr>
                        <td>密码:</td>
                        <td><input type="password" name="password">
                        </td>
                    </tr>
                </table>
            <br>
                <input type="submit" value="登录" style="color:#BC8F8F">
            </form>
            <form action="zhuce.jsp">
                <input type="submit" value="注册" style="color:#BC8F8F">
            </form>
    </center>
</body>
</html>

indexcheck.jsp登录失败代码:

<%@ 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 login where username="+"'"+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>

indexsuccess.jsp登录成功代码:

<%@ 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>登陆成功</h1>
</body>
</html>

最终的页面效果如下:

jsp里怎么写登录界面

如果全都正确,则显示如下页面:

jsp里怎么写登录界面

如果密码错误,则显示如下页面:

jsp里怎么写登录界面

以上就是jsp里怎么写登录界面的详细内容,更多请关注其它相关文章!

相关标签: jsp