javaEE之jsp+JavaBean实现登录功能

来源:尤腻腻小厨房 发布时间:2018-11-24 10:20:24 阅读量:1123

javaEE之jsp+JavaBean实现登录功能(不加数据库)

实现效果






JavaBean文件(全部放在nmx包中,请注意更改):


#UserBean.java


package nmx;


public class UserBean {

private String username;

private String realname;

private String sex;

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getRealname() {

return realname;

}

public void setRealname(String realname) {

this.realname = realname;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

}


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#UserDataBean.java


package nmx;


public class UserDataBean {

private String username;

private String password;

private String realname;

private String sex;

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getRealname() {

return realname;

}

public void setRealname(String realname) {

this.realname = realname;

}

public String getSex() {

return sex;

}

public void setSex(String sex) {

this.sex = sex;

}

public UserDataBean(String u,String p,String r,String s){

username=u;

password=p;

realname=r;

sex=s;

}

public UserDataBean(){}

//默认的无参的构造函数

}


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#UserLoginBean


package nmx;


public class UserLoginBean {

private String username;

private String password;

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

}


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#UserManagerBean


package nmx;


import java.util.Iterator;

import java.util.LinkedList;

import java.util.List;


public class UserManagerBean {

private List<UserDataBean> userList;


public List<UserDataBean> getUserList() {

return userList;

}


public void setUserList(List<UserDataBean> userList) {

this.userList = userList;

}

public UserManagerBean(){

userList=new LinkedList<UserDataBean>();

userList.add(new UserDataBean("sa","sa","管理员","男"));

userList.add(new UserDataBean("test","abc123","测试员","女"));

}

public UserBean login(String username,String password){//登录验证函数

UserBean userBean=null;

Iterator<UserDataBean> iter=userList.iterator();

while(iter.hasNext()){

UserDataBean user=iter.next();

if(user.getUsername().equals(username)){

if(user.getPassword().equals(password)){

userBean =new UserBean();

userBean.setUsername(username);

userBean.setRealname(user.getRealname());

userBean.setSex(user.getSex());

}

break;

}

}

return userBean;

}

}


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jsp/html文件:

#login.html



    <!DOCTYPE html>

<html>

  <head>

    <title>登录</title>

    <meta name="keywords" content="keyword1,keyword2,keyword3">

    <meta name="description" content="this is my page">

    <meta name="content-type" content="text/html; charset=UTF-8">

    <meta http-equiv="content-type" content="text/html;charset=utf-8">

    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->


  </head>

  

  <body>

    <form action="validate.jsp" method="post">

    用户名:<input type="text" name="username"/><br>

 密码: <input type="password" name="password" /><br>

 <input type="submit" value="登录" />

    </form>

  </body>

</html>

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#validate.jsp


<%@ page language="java"  import="java.util.*,nmx.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    

    <title>My JSP 'validate.jsp' starting page</title>

    

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">    

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->


  </head>

  

  <body>

    <% request.setCharacterEncoding("utf-8"); %>

   <!-- 将登录表单里的参数读到UserLoginBean的java类里面 -->

    <jsp:useBean id="userLogin" class="nmx.UserLoginBean" scope="request"/>

    <jsp:setProperty property="*" name="userLogin" />

    <jsp:useBean id="userManager" class="nmx.UserManagerBean" scope="application" />

    <% UserBean userBean=userManager.login(userLogin.getUsername(), userLogin.getPassword());

     if(userBean!=null){

       session.setAttribute("user", userBean);

       response.sendRedirect("main.jsp");

     } else{

     response.sendRedirect("error.html");

     }

     %>

  </body>

</html>

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#main.jsp


<%@ page language="java" import="java.util.*,nmx.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    

    <title>My JSP 'main.jsp' starting page</title>

    

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">    

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->


  </head>

  

  <body>

    <jsp:useBean  id="user" class="nmx.UserBean" scope="session" />

    <% if(user.getUsername()==null) response.sendRedirect("login.html"); %>

    Hi,<%=user.getUsername() %><br>

    <jsp:useBean id="userManager" class="nmx.UserManagerBean" scope="application" />

    <table border="1">

    <caption>用户列表</caption>

    <tr><th>用户名</th><th>密码</th><th>姓名</th><th>性别</th></tr>

    <% Iterator<UserDataBean> iter=userManager.getUserList().iterator();

    while(iter.hasNext()){

      UserDataBean userData=iter.next();

    

     %>

     <tr><td><%=userData.getUsername() %></td><td><%=userData.getPassword() %></td>

     <td><%=userData.getRealname() %></td><td><%=userData.getSex() %></td></tr>

  <%  } %>

    </table>

  </body>

</html>


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#error.html


<!DOCTYPE html>

<html>

  <head>

    <title>error.html</title>

    <meta name="keywords" content="keyword1,keyword2,keyword3">

    <meta name="description" content="this is my page">

    <meta name="content-type" content="text/html; charset=UTF-8">

    <meta http-equiv="content-type" content="text/html;charest=utf-8">

    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->


  </head>

  <body>

    用户名或密码错误,请<a href="login.html">重新登录</a>

  </body>

</html>


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完成后将此web项目部署到Tomcat 8 上,启动服务器,通过相应连接即可访问验证。

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