JSP实现数据传递与保存

业务逻辑：

1、登陆login.jsp

2、判断登陆是否成功check.jsp

3、登陆成功页面newsDetail.jsp

4、登陆失败转发到login.jsp

代码如下：

<%@ 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>用户登陆页</title>
</head>
<body>

<form action="check.jsp" method="post">
    <table>
        <tr>
            <td>用户名：</td>
            <td><input  type="text" name="username"/></td>
        </tr>
        <tr>
            <td>密码：</td>
            <td><input  type="text" name="pwd"/></td>
        </tr>
        <tr>
            <td>邮箱：</td>
            <td><input type="text" name="email" /></td>
        </tr>            
        
        <tr>
            <td align="right"><input type="checkbox" name="title" value="10001" /></td>
            <td>第一个选项</td>
        </tr>
        <tr>
            <td align="right"><input type="checkbox" name="title" value="10002" /></td>
            <td>第二个选项</td>
        </tr>        
        <tr>
            <td align="right"><input type="checkbox" name="title" value="10004" /></td>
            <td>第三个选项</td>
        </tr>
        
        <tr>    
            <td align="right"><input type="submit" value="提交" /></td>
        </tr>                
    </table>
</form>
<%
    Object obj = request.getAttribute("error");
    if(obj!=null){
        out.println("info=>>>>>>"+obj.toString());
    }
 %>


</body>
</html>

check.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8" 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 'index.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">
  </head>
 
      
      
  <body>
   <%
       //获取表单提写数据
      request.setCharacterEncoding("utf-8");
      response.setCharacterEncoding("utf-8");
      String username = request.getParameter("username");
      String password = request.getParameter("pwd");
      String email = request.getParameter("email");
  /* 获取checkbox的值*/
    String[] titles = request.getParameterValues("title");
      String alltitle="";
      if(titles!=null && titles.length!=0){
          for(int i=0;i<titles.length;i++){
          alltitle += titles[i]+"&nbsp";
          }
      } 
      //判断登陆是否成功
      if(!username.equals("admin")){
          request.setAttribute("error", "登陆失败！");
          request.getRequestDispatcher("login.jsp").forward(request, response);
          
      }else{
          //登陆成功，创建session会话，保存登陆状态
          session.setAttribute("username", username);
          session.setAttribute("password", password);
          //session设置过期时间
          session.setMaxInactiveInterval(5);
          response.sendRedirect("newsDetail.jsp");
          
      }
      
      %>
  </body>
</html>

newsDetail.jsp

<!--页面的头部-->
<div id="header">
    <!--页面顶部-->
    <div class="main-top">
        <div class="logo"><a href=""><span>新闻大视野</span></a></div>
        <div class="login-box">
        <%
        Object obj=session.getAttribute("username");
        Object pwd=session.getAttribute("password");
        String username="";
        String password="";
        if(obj!=null &&pwd!=null){
            username = obj.toString();
            password = pwd.toString();%>
            <label><%="欢迎你，"+username %></label>&nbsp;&nbsp;<a href="logout.jsp">注销</a>
        <% }else{%>
        <label>用户名</label><input type="text" name="username"/><label>密码</label><input type="text" name="password"/><button>登录</button>
        <%}%>
            
        </div>

 

posted @ 2016-08-07 16:58  sincoolvip  阅读(827)  评论(0)  编辑  收藏  举报