MVC循序渐进(jsp model1实现的登录)

类别:Java 点击:0 评论:0 推荐:

   1、  eclipse菜单 File->New->Others..   选择 Java->Tomcat Project 输入项目名称

webapp。

   2、用jsp  model1实现用户登录

(1)、eclipse菜单 File->New->Folder     文件夹名称   model1

(2)、新建jsp文件

      webapp\model1\ login.jsp

      webapp\model1\ succeed.jsp  

 (3)、login.jsp
******************************************************************************
<%@ page language="java" pageEncoding="GB2312" %>
<!DOCTYPE HTML PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<title>login</title>
</head>
<%
boolean isSucceed=false;
String msg="";
String username=request.getParameter("username");
String password=request.getParameter("password");
if(username!=null){
  System.out.println("登陆处理开始.........");
  username=username.trim();
  password=password.trim();
  if(username.equals("")&&username.equals("")){
    isSucceed=false;
    msg="用户名或密码为空";
  }else{
    isSucceed=true;
  }
  if(isSucceed){
    if(username.equals("zkjbeyond")&&password.equals("zkjbeyond")){
      isSucceed=true;
      session.setAttribute("username",username);
      msg="登陆成功";
      response.sendRedirect("succeed.jsp");
    }else{
      isSucceed=false;
      msg="用户名密码不正确";
    }
  }
}
System.out.println(msg);
System.out.println("登陆处理结束.........");
%>
<body bgcolor="#FFFFFF">
<form action="login.jsp" method="post">
<div>
<span style="width:70;">用户名:</span>
<span><input type="text" name="username"></span>
</div>
<div>
<span style="width:70;">密 码:</span>
<span><input type="password" name="password"></span>
</div>
<div>
<span style="width:70;"></span>
<span><input type="submit"></span>
</div>
<div style="color:red;">
<%
if(!isSucceed)
    out.println(msg);  
%>
</div>
</form>
</body>
</html>
**************************************************************************************
succeed.jsp
<%@ page language="java" pageEncoding="GB2312" %>
<!DOCTYPE HTML PUBLIC "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<title>succeed</title>
</head>
<body bgcolor="#FFFFFF">
<%

Object username=session.getAttribute("username");
if(username!=null)
  out.println("用户名为:"+username);
else
  response.sendRedirect("login.jsp");
%>
</body>
</html>

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