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本篇内容主要讲解“java+mysql怎么实现登录和注册功能”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“java+mysql怎么实现登录和注册功能”吧!
1、首先是账号密码输入框和按钮:
登录:
<form action="login.do" method="get"> <table> <tr><td>账号:</td><td><input type="text" name="id" /></td></tr> <tr><td>密码:</td><td><input type="password" name="password" /></td></tr> <tr><td> <a href="register.jsp" rel="external nofollow" >还没注册?点击注册</a></td><td><input id="login_in" type="submit" value=" 登录 "></td></tr> </table> </form>
注册:
<form name="form1" action="register.do" method="post"> <table width="200" border="0"> <tr> <td colspan="2"> <div id="status">注册新用户</div> </td> <tr> <td>*用户名</td> <td><input type="text" name="username" size="10" id="username"></td> </tr> <tr> <td>*密码</td> <td><input type="password" name="password1" size="10"></td> </tr> <tr> <td>*确认密码</td> <td><input type="password" name="password2" size="10"></td> </tr> <tr> <td>Email</td> <td><input type="text" name="email" size="10"></td> </tr> <tr> <td colspan="2"><a href="login.jsp" rel="external nofollow" >返回登录页</a> <input type="submit" name="submit" value="提交注册"></td> </tr> </table> </form>
两个form表的属性里都有action,可理解为是用来标记登录和注册的,在web.xml中和对应的servlet绑定
2、数据库建表,插入数据
在服务器中打开MySQL,建表
create table login( uname char(15) primary key, password char(15) not null, email char(20) )
3、sql语句内嵌到java语句中,查找(登录)和插入(注册)用户信息,以下类名即为文件的名字
登录:
import java.sql.*; public class userlogin { String drv = "com.mysql.jdbc.Driver"; String url = "jdbc:mysql://localhost:3306/login"; String usr = "root"; String pwd = "***";//自己的密码 public boolean isuserlogin(String id,String password){ boolean isValid = false; String sql="select * from ulogin where uname='"+id+"' and password='"+password+"'"; try{ Class.forName(drv).newInstance(); Connection conn = DriverManager.getConnection(url,usr,pwd); Statement stm = conn.createStatement(); ResultSet rs = stm.executeQuery(sql); if(rs.next()){ isValid = true; } rs.close(); stm.close(); conn.close(); }catch (Exception e) { e.printStackTrace(); System.out.println(e); } if(isValid){//判断用户名以及密码是否与设定相符 return true; } else return false; } }
注册:
import java.sql.*; public class register { String drv = "com.mysql.jdbc.Driver"; String url = "jdbc:mysql://localhost:3306/login"; String usr = "root"; String pwd = "***"; public boolean userregister(String id,String password,String email){ boolean b = false; String sql = "select * from ulogin where uname='"+id+"'"; try{ Class.forName(drv).newInstance(); Connection conn = DriverManager.getConnection(url,usr,pwd); Statement stm = conn.createStatement(); ResultSet rs = stm.executeQuery(sql); if(!rs.next()){ sql = "insert into ulogin(uname,password,email) values('"+id+"','"+password+"','"+email+"')"; stm.execute(sql); b = true; } rs.close(); stm.close(); conn.close(); }catch (Exception e) { e.printStackTrace(); System.out.println(e); } if(b) { return true; } else return false; } }
4、构建servlet来处理事务,如果连接数据库查找成功,则登录成功,否则失败;如果注册成功返回登录界面
登录:由用户输入信息,所以使用doGet方法
@WebServlet(name = "ServletLogin") public class ServletLogin extends HttpServlet { public void init() throws ServletException { } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ boolean b=false; userlogin MyPOJO=new userlogin();//新建MyPOJO类的对象myPOJO //根据标示名获取JSP文件中表单所包含的参数 String id=request.getParameter("id"); String password=request.getParameter("password"); String result = ""; b=MyPOJO.isuserlogin(id,password);//使用模型对账号和密码进行验证,返回一个boolean类型的对象 PrintWriter out = response.getWriter(); if(b){ //如果验证结果为真,跳转至登录成功页面 out.println("success"); result = "success"; //Cookie Cookie username= new Cookie("username",id); //设置路径,这个路径即该工程下都可以访问该cookie 如果不设置路径,那么只有设置该cookie路径及其子路径可以访问 username.setPath("/"); username.setMaxAge(60*60); response.addCookie(username); response.sendRedirect("index.jsp"); } else { //如果验证结果为假,跳转至登录失败页面 out.println("fail"); result = "fail"; response.sendRedirect("JSP/LoginFailed.jsp" ); } out.write(result); out.flush(); out.close(); System.out.println(result); }
注册:使用doPost方法
@WebServlet(name = "ServletRegister") public class ServletRegister extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { boolean b = false; register myPOJO=new register(); String id=request.getParameter("username"); String password=request.getParameter("password1"); String email = request.getParameter("email"); b=myPOJO.userregister(id,password,email); if(b){ response.sendRedirect("login.jsp"); } else{ response.sendRedirect("register.jsp"); } } }
5、在web.xml中将servlet和url-pattern进行匹配
<servlet> <servlet-name>ServletLogin</servlet-name> <servlet-class>service.ServletLogin</servlet-class> </servlet> <servlet-mapping> <servlet-name>ServletLogin</servlet-name> <url-pattern>/login.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>ServletRegister</servlet-name> <servlet-class>service.ServletRegister</servlet-class> </servlet> <servlet-mapping> <servlet-name>ServletRegister</servlet-name> <url-pattern>/register.do</url-pattern> </servlet-mapping>
6、测试运行
将服务器端的mysql数据库中加入一条用户信息:
insert into ulogin values('test1','123',null);
网页上输入该信息:
点击登录:登陆成功
注册:在注册框中输入信息:
提交后在数据库中查找该用户信息:
注意:项目中应该导入jsp-api.jar和servlet-api.jar两个jar包
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