jsp登录注册完整实现代码(增删改查+网页+数据库)

目录

一·登录注册代码以及效果

register.jsp:注册

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注册</title>
<style>
 #a {
    width:50%;
    height:200px;
    border: 1px dashed ;
    background-color:lightyellow;
    text-align:center;
}
body{
background-color:lightblue;
}
</style>
</head>
<body>
	<form action="doregister.jsp" method="post">
		用户名:<input type="text" name="uname"><br>
		密码:<input type="password" name="upwd"><br>
		备注:<textarea rows="" cols="" name="uinfo">
		</textarea><br>
		<input type="submit" value="注册">
		<input type="reset" value="重置">
	</form>
</body>
</html>

doregister.jsp:注册信息弹框

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//设置编码-设置请求对象的编号
	request.setCharacterEncoding("utf-8");
	//接收注册页面传递的数据
	String uname = request.getParameter("uname");
	String upwd = request.getParameter("upwd");
	String uinfo = request.getParameter("uinfo");
	//连接数据库
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	/*
	查询到用户的最大编号
	最大编号+1,做为新添加的用户的编号
	*/

	//这里的代码是用来 得到最新编号的
	int nextId=1;//做为新用户的编号
	PreparedStatement ps = con.prepareStatement("select max(uuid) from T277");
	//执行sql语句
	ResultSet rs= ps.executeQuery();
	if(rs.next()){
		//查询到最大的编号,加1,就是新数据的编号
		nextId = rs.getInt(1)+1;
	}
	
	//这里的代码 开始执行添加用户操作
	ps = con.prepareStatement("insert into T277 values(?,?,?,?)");
	ps.setInt(1, nextId);
	ps.setString(2, uname);
	ps.setString(3, upwd);
	ps.setString(4, uinfo);
	//执行sql语句
	int i = ps.executeUpdate();
	if(i>0){
		out.print("<script>alert('注册成功');location.href='login.jsp'</script>");
	}else{
		out.print("<script>alert('注册失败');location.href='register.jsp'</script>");
	}
		
	
%>

login.jsp:登录

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录</title>
<style>
 #a {
    width:50%;
    height:200px;
    border: 1px dashed ;
    background-color:lightyellow;
    text-align:center;
}
body{
background-color:lightblue;
}
</style>
</head>
<body>
	<form action="dologin.jsp">
		用户名:<input type="text" name="uname"><br>
		密码:<input type="password" name="upwd"><br>
		<input type="submit" value="登录">
		<input type="button" value="注册" onclick="javascript:location.href='register.jsp'">		
	</form>
</body>
</html>

dologin.jsp:与数据库相连、存放登陆的用户

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//接收login页面传递的数据
	String uname = request.getParameter("uname");
	String upwd = request.getParameter("upwd");
	//连接数据库
	//注册驱动类
	//OracleDriver
	Class.forName("oracle.jdbc.driver.OracleDriver");
	//连接数据库
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	//创建对象
	PreparedStatement ps = con.prepareStatement("select * from T277 where uname=? and upwd=?");
	//给占位符赋值
	ps.setString(1, uname);
	ps.setString(2, upwd);
	//执行sql语句
	ResultSet rs = ps.executeQuery();
	//处理结果
	if(rs.next()){
		//转发
		request.getRequestDispatcher("index.jsp").forward(request, response);
	}else{
		//失败
				out.print("<script>alert('用户名或密码错误,请重新登录');location.href='login.jsp'</script>");
	}
	//关闭连接
%>

index.jsp:主界面

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>主页面</title>
<style>
 #a {
    width:50%;
    height:200px;
    border: 1px dashed ;
    background-color:lightyellow;
    text-align:center;
}
body{
background-color:lightblue;
}
</style>
</head>
<body>
	<table border="1" align="center" width="80%">
		<tr>
			<td>编号</td>
			<td>用户名</td>
			<td>密码</td>
			<td>备注</td>
			<td>操作</td>
		</tr>
		<%
		//连接数据库 进行查询所有数据
		//注册驱动类
		Class.forName("oracle.jdbc.driver.OracleDriver");
		//连接数据库
		String url = "jdbc:oracle:thin:@localhost:1521:orcl";
		Connection con = DriverManager.getConnection(url, "scott", "tiger");
		//创建Pre对象
		PreparedStatement ps = con.prepareStatement("select * from T277 order by uuid");
		//执行sql语句
		ResultSet rs = ps.executeQuery();
		//处理结果-遍历结果集
		while(rs.next()){
		%>
			<tr align="center">
				<td><%=rs.getInt(1) %></td>
				<td><%=rs.getString("uname") %></td>
				<td><%=rs.getString("upwd") %></td>
				<td><%=rs.getString(4) %></td>
				<td>
					<a href="doup.jsp?uuid=<%=rs.getInt(1)%>" rel="external nofollow" >修改</a>
					<a href="info.jsp?uuid=<%=rs.getInt(1)%>" rel="external nofollow" >详情</a>
					<a href="dodel.jsp?uuid=<%=rs.getInt(1)%>" rel="external nofollow" >删除</a>
				</td>
			</tr>
			<%} %>
	</table>
</body>
</html>

update.jsp:修改

<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//设置编码-设置请求对象的编号
	request.setCharacterEncoding("utf-8");
	//接收修改页面传递的数据
	String uname = request.getParameter("uname");
	String upwd = request.getParameter("upwd");
	String uinfo = request.getParameter("uinfo");
	//获取要修改的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	//JDBC 删除  
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	PreparedStatement ps = con.prepareStatement("update T277 set uname=?,upwd=?, uinfo=? where uuid="+uuid);
	ps.setString(1, uname);
	ps.setString(2, upwd);
	ps.setString(3, uinfo);
	int i = ps.executeUpdate();
	if(i>0){
		out.print("<script>alert('修改成功');location.href='index.jsp'</script>");
	}else{
		out.print("<script>alert('修改失败');location.href='index.jsp'</script>");
	}
%>

doup.jsp:修改页面(帮助)

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>insert title here</title>
</head>
<body>
<%
	//获取要修改的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	%>
	<form action="update.jsp?uuid=<%=uuid %>" method="post">
		用户名:<input type="text" name="uname"><br>
		密码:<input type="password" name="upwd"><br>
		备注:<textarea rows="" cols="" name="uinfo">
		
		</textarea><br>
		<input type="submit" value="修改">
		<input type="reset" value="重置">
	</form>
</body>
</html>

info.jsp:详情

<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//获取要修改的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	//JDBC 删除
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	PreparedStatement ps = con.prepareStatement("select * from T277 where uuid="+uuid);
	ResultSet rs= ps.executeQuery();
	if(rs.next()){
			%>
		<form>
			用户名:<input type="text" name="uname" value="<%=rs.getString("uname") %>"><br>
			密码:<input type="password" name="upwd" value="<%=rs.getString("upwd") %>"><br>
			备注:<textarea rows="" cols="" name="uinfo" >
			<%=rs.getString(4) %>
			</textarea><br>
			<a href="index.jsp" rel="external nofollow" >返回</a>
		</form>
		<%} %>
		
		

dodel.jsp:删除界面

<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page import="oracle.jdbc.driver.OracleDriver"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
	//获取要删除的用户编号
	String id = request.getParameter("uuid");
	//把字符串转换为整数编号
	int uuid = Integer.valueOf(id);
	//JDBC 删除
	Class.forName("oracle.jdbc.driver.OracleDriver");
	String url = "jdbc:oracle:thin:@localhost:1521:orcl";
	Connection con = DriverManager.getConnection(url, "scott", "tiger");
	PreparedStatement ps = con.prepareStatement("delete T277 where uuid="+uuid);
	int i = ps.executeUpdate();
	if(i>0){
		out.print("<script>alert('删除成功');location.href='index.jsp'</script>");
	}else{
		out.print("<script>alert('删除失败');location.href='index.jsp'</script>");
	}
%>

二·页面跳转的方式以及他们的区别

1、跳转路径并传递数据

 //假设法:假设我的用户名为admin 密码为123
    if("admin".equals(name)&&"123".equals(pwd)){
        //说明登录成功 跳转到success.jsp
//1.重定向 将页面跳转 地址栏发生了改变
        //不能将值传递到下一个界面  可以跳转到任意资源  在客户端发挥作用
        response.sendRedirect("http://www.baidu.com");
//2.转发 将页面跳转 可以将值传递到下一个界面 
        //但是地址栏不发生改变 而是停留在了之前的页面 只能转发到当前项目内资源 在服务器端发挥作用
        //request.getRequestDispatcher("http://www.baidu.com").forward(request, response);
    }
    else{
        //说明登录失败 提示用户并返回登录界面login.jsp js的跳转属于重定向 地址栏发生了改变 login-->dologin-->login
        out.print("<script>alert('用户名或者密码有误');location.href='login.jsp';</script>");
    } 

2、页面跳转的两种方式和区别

重定向:地址栏发生改变 不能传值 可以跳转到任意资源 在客户端发挥作用
转发:地址栏不发生改变 能传值 只能跳转到当前项目内资源 在服务器端发挥作用

语法:
重定向:response.sendR()

转发:request.getreq .for(request,response)

三·其他

1、jdbc连接Oracle

URL:jdbc:oracle:thin:@localhost:1521:orcl

2、乱码

request.setCharacterEncoding("utf-8");

3、添加数据时,获取最新编号

//这里的代码是用来 得到最新编号的   
    int nextId=1;//做为新用户的编号
    PreparedStatement ps = con.prepareStatement("select max(uuid) from T277");
    //执行sql语句
    ResultSet rs= ps.executeQuery();
    if(rs.next()){
        //查询到最大的编号,加1,就是新数据的编号
        nextId = rs.getInt(1)+1;
    }

总结 

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