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为了练手，我就自己试着做了一个网站的登录与注册的小案例。由于没有做美化处理，所以界面并不是很好看。 网站实现的功能如下： •用户首次注册功能 下面我将会分模块展示 注册模块 首先需要一个注册界面，如下register.jsp： <%@ page 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>User to Register Page!</title> </head> <body> <hr><br>Welcome to this <font color="green">Enroll(Register) Page</font>!<br> <form action="do_register.jsp" method="get"> <br> <h1>Please input your message:</h1><br> Name:<input type="text" name="register_name"><br> Pswd:<input type="password" name="register_password"><br> <br><br><br> <input type="submit"> <input type="reset"><br> </body> </html> 然后就是action对应的注册处理页，如下do_register.jsp：
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.sql.*" %>
<!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>Server to do the register page!</title>
</head>
<body>
<%
String Register_name=request.getParameter("register_name");
String Register_password=request.getParameter("register_password");
%>
<%
try{
Class.forName("com.mysql.jdbc.Driver");
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/summer", "root", "mysql");
Statement stmt=conn.createStatement();
//desogn the sql statement
String InsertSQL="INSERT INTO User(Name,Password) values('"+Register_name+"','"+Register_password+"')";
System.out.println(Register_name+"\t"+Register_password);
//do the query operation,and here is the most important sql statement.
int FLAG=stmt.executeUpdate(InsertSQL);
if(FLAG>0){
response.getWriter().write("Congratulation! REgister Success!");
}else{
response.getWriter().write("Sorry!Register Failed!\nPlease Retry it!");
}
}catch(SQLException e){
}
%>
</body>
</html>
小总结： 登录模块 首先是登录界面，login.jsp，鄙人加进去一个超链接（用意是让login.jsp作为门户页面，实现登录注册合二为一的效果，虽然二者并没有合二为一，而且注册界面过于简单了），大家就先凑活看吧。 <%@ page 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>User Login Page</title> </head> <body> <hr><br>Welcome to this <font color="green">Login Page</font>!<br> <form action="do_login.jsp" method="get"> <br> <h1>Please input your message:</h1><br> Name:<input type="text" name="name"><br> Pswd:<input type="password" name="password"><br> <br><br><br> <input type="submit"> <input type="reset"><br> Click me to <font color="green"><a href="register.jsp">Register</a>!</font><br> </form> </body> </html> 然后是对登录信息的处理页，do_login.jsp:
<%@page import="java.sql.DriverManager"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.sql.*" %>
<!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>Server Page Depend !</title>
</head>
<body>
<h3>Which Pae will be depend by the user's message!</h3>
<%
String name=request.getParameter("name");
String password=request.getParameter("password");
%>
<%
Class.forName("com.mysql.jdbc.Driver");
Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/summer", "root", "mysql");
Statement stmt=conn.createStatement();
//desogn the sql statement
String queryNumberSQL="SELECT Name from User where Name='"+name+"' and Password='"+password+"'";
//do the query operation
ResultSet rs=stmt.executeQuery(queryNumberSQL);
boolean flag=false;
if(rs.next()){
flag=true;
session.setAttribute("UserName", name);
}else{
flag=false;
}
%>
<%
if(flag){
%>
<jsp:forward page="login_success.jsp"></jsp:forward>
<%
}else{
%>
<jsp:forward page="login_failed.jsp"></jsp:forward>
<%
}
%>
</body>
</html>
对于登陆成功的用户，跳转到登陆成功界面login_success.jsp:
<%@ page 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>User Login Success Page!</title>
</head>
<body>
<hr><br>
<h1>Login Success!</h1><br>
<font color="green">Welcome <%=session.getAttribute("UserName") %>!</font>
<h3 align="center">your persional Message is:</h3>
<%
out.println("Name:"+session.getAttribute("UserName"));
%>
<font color="red"><a href="login.jsp">Click me</a> to log out!</font>
</body>
</html>
对于登录失败的用户，进行温馨的页面提示，login.failed.jsp: <%@ page 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>Login Failed Page!</title> </head> <body> <hr> <br> <h1><font color="red">Sorry,Login Failed</font></h1><br> <font color="red"><a href="login.jsp">Click me</a> to login!</font> </body> </html> 大总结： 进步之处： •使用到了session对象来存储用户登录的姓名信息，实现了页面间的信息的交互 不足之处： •代码过于繁冗，复用性不好 待改进之处： •加上复杂一点的用户注册，使用bean的方式做处理比较好 以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持极客世界。 |
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