jsp实现用户登录

zoukankan html css js c++ java

jsp实现用户登录
登录界面 login.jsp:
[java] view plain copy

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<%

   String path = request.getContextPath();

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

%>

<html>

    <head>

        

        <title>imooc - Login</title>

        

        

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

        <link type="text/css" href="css/smoothness/jquery-ui-1.7.2.custom.html" rel="stylesheet" />

        <script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>

        <script type="text/javascript" src="js/easyTooltip.js"></script>

        <script type="text/javascript" src="js/jquery-ui-1.7.2.custom.min.js"></script>

        

    </head>

    <body>

    <div id="container">

        <div class="logo">

            <a href="#"><img src="logo.png" alt="" /></a>

        </div>

        <div id="box">

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

            <p class="main">

                <label>用户名: </label>

                <input name="username" value="" />

                <label>密码: </label>

                <input type="password" name="password" value="">

            </p>

            <p class="space">

                <input type="submit" value="登录" class="login" style="cursor: pointer;"/>

            </p>

            </form>

        </div>

    </div>

    </body>

</html>
对登录的响应 dologin.jsp:
[java] view plain copy

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<%

  String path = request.getContextPath();

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

  String username ="";

  String password ="";

  request.setCharacterEncoding("utf-8");//防止中文乱码



  username = request.getParameter("username");

  password = request.getParameter("password");



  //如果用户和密码都等于admin,则登录成功

  if("admin".equals(username)&&"admin".equals(password))

  {

     session.setAttribute("loginUser", username);

     request.getRequestDispatcher("login_success.jsp").forward(request, response);



  }

  else

  {

     response.sendRedirect("login_failure.jsp");

  }

%>
这里注意的是：

request传送信息需要设置编码方式，request.setCharacterEncoding("utf-8");
```
	request.getRequestDispatcher("login_success.jsp")取得一个RequestDispatcher，一个请求分发器对象，它的方法forward(request,response)作用是将请求转发到login_success.jsp，request封装了请求信息，response封装了响应信息。注意是forward方式，这种方式只转发请求，不产生新的request对象。如下图：
```
```
	成功界面：login_success.jsp
```
[java] view plain copy

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<%

   String path = request.getContextPath();

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

%>

<html>

    <head>

        

        <title>imooc - Login</title>

        

        

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

        <link type="text/css" href="css/smoothness/jquery-ui-1.7.2.custom.html" rel="stylesheet" />

        <script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>

        <script type="text/javascript" src="js/easyTooltip.js"></script>

        <script type="text/javascript" src="js/jquery-ui-1.7.2.custom.min.js"></script>

        

    </head>

    <body>

    <div id="container">

        <div class="logo">

            <a href="#"><img src="logo.png" alt="" /></a>

        </div>

        <div id="box">

        <%

            String loginUser = "";

            if(session.getAttribute("loginUser") != null) {

                loginUser = session.getAttribute("loginUser").toString();

            }

        %>



            欢迎您<font color = "red"> <%=loginUser %></font>,登陆成功！

        </div>

    </div>

    </body>

</html>
```
login_failure.jsp:
```
[java] view plain copy

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

<%

   String path = request.getContextPath();

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

%>

<html>

    <head>

        

        <title>imooc - Login</title>

        

        

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

        <link type="text/css" href="css/smoothness/jquery-ui-1.7.2.custom.html" rel="stylesheet" />

        <script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>

        <script type="text/javascript" src="js/easyTooltip.js"></script>

        <script type="text/javascript" src="js/jquery-ui-1.7.2.custom.min.js"></script>

        

    </head>

    <body>

    <div id="container">

        <div class="logo">

            <a href="#"><img src="logo.png" alt="" /></a>

        </div>

        <div id="box">

            登录失败！检查用户或者密码

            <a href="login.jsp">返回登录界面</a>

        </div>

    </div>

    </body>

</html>
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原文地址：https://www.cnblogs.com/zhangmingzhao/p/7077439.html