目录

一·登录注册代码以及效果

二·页面跳转的方式以及他们的区别

三·其他

---

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"%>








	

		用户名:

		密码:

		备注:		

		
		
	

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");
	

	//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("");
	}else{
		out.print("");
	}
		
	
%>

login.jsp:登录

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>








	

		用户名：

		密码:

		
				
	

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("");
	}
	//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"%>








	
		<%
		//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()){
		%>
			
			<%} %>
	

		

			
编号
			
用户名
			
密码
			
备注
			
操作
		

				
<%=rs.getInt(1) %>
				
<%=rs.getString("uname") %>
				
<%=rs.getString("upwd") %>
				
<%=rs.getString(4) %>
				

					">修改
					">详情
					">删除
				
			

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("");
	}else{
		out.print("");
	}
%>

doup.jsp:修改页面（帮助）

<%@ 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);
	%>
	

		用户名:

		密码:

		备注:		
		

		
		
	

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()){
			%>
		

			用户名:">

			密码:">

			备注:			<%=rs.getString(4) %>
			

			返回
		
		<%} %>
		
		

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("");
	}else{
		out.print("");
	}
	
	
%>
	

二·页面跳转的方式以及他们的区别 1.1、页面跳转方式
    1.2、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
    
一、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;
    }