java中response对象 java中response对象用法实例分析

时间:2021-03-20 官林辉人气:0

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本文实例讲述了java中response对象用法。分享给大家供大家参考，具体如下：

<jsp:forward>动作元素用于运行时在服务器端结束当前页面的执行，并从当前页面转向指定页面。

使用response对象的setHeader()方法可以设置页面的自动刷新时间间隔。实现每隔60秒重新加载本页面的语句为：

复制代码代码如下:

response.setHeader("refresh",60);

而实现3秒后浏览器加载新页面//www.qb5200.com的语句为：

复制代码代码如下:

response.setHeader("refresh","3;URL=//www.qb5200.com");

response的方法：void sendRedirect(String url)，将页面重定向到指定的URL地址上。

实例：使用response实现用户登录功能

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <title>登录功能实例</title>
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="this is my page">
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
 </head>
 <body>
  <center>
  <h1>登录界面</h1>
  <form action="login.jsp" method="post">
        姓名：<input type="text" name="name"><br>
    密码：<input type="password" name="pwd"><br>
    <input type="submit" name="submit" value="登录">
    <input type="reset" name="reset" value="重置">
  </form>
  </center>
 </body>
</html>

<%@ 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+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">
  <title>登录功能实例</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>
  <center>
  <h1>登录功能实例</h1>
  <%
   request.setCharacterEncoding("UTF-8");
   String name = request.getParameter("name");
   String pwd = request.getParameter("pwd");
   if(name != null && pwd != null && name.equals("guanlin") && pwd.equals("123"))
   {
    //response.sendRedirect("success.jsp");
  %>
  <jsp:forward page="success.jsp"></jsp:forward>
  <%}else
  {
  out.println("<font color='red'>用户名或密码错误，5秒钟回到登录页面，如果不想等待请点<a href='response/login.html'>返回登录</a></font>");
  response.setHeader("refresh","5;url = login.html");
  }
  %>
  </center>
 </body>
</html>

success.jsp的源代码如下：

<%@ 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+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">
  <title>登录功能实例</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>
  <center>
  <h1 style="green">登录成功!</h1>
  <%
   request.setCharacterEncoding("UTF-8");
   String name = request.getParameter("name");
   String pwd = request.getParameter("pwd");
   %>
   登录的用户名为：<%=name %><br>
   登录的密码为：<%=pwd %>
  </center>
 </body>
</html>

希望本文所述对大家Java程序设计有所帮助。

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