我要评论一·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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