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
•用户登录功能
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:
不足之处:
•对于数据库的操作做得不够好,没有及时的将不用的资源关闭,应该及时的对那些不用的打开的资源进行关闭操作,释放资源。
•界面效果做的不够好,response输出是先于out的输出的。
•数据库操作显得过于繁琐,应该集成一下,做一个专门处理数据库操作的工具包,以实现代码的良好的复用性!
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
•配合了MySQL,在一定程度上体验了JEE的模式
不足之处:
•代码过于繁冗,复用性不好
•资源利用率不高,使用过的不再使用的资源要及时的进行关闭。虽然java虚拟机有自动的垃圾回收机制,但最好还是养成好的习惯!
•界面控制做的不够好,体验性差,欠缺思考
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
•模块化,使用MVC的概念
•改善界面的权限,防止盗链
•加上其他的诸如上传文件,下载文件功能,丰富网站的功能。
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VeVb武林网。
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