观看慕课老师milanlover视频include指令+include动作+forward动作+param动作

于 2019-03-31 22:00:19 发布
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本文详细介绍了在Java Web开发中使用include指令进行页面包含和jsp:include标签实现页面跳转的技术，包括如何在主页面与包含页面间传递参数，并展示了通过服务器内部跳转方法实现页面流转的实例。

format()方法

使用inclue指令包含了一个date页面，在这个页面上显示了 被包含页面的内容。

新建date.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%@ page import="java.text.*" %>
<%
	Date d=new Date();
	SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日");
	String s=sdf.format(d);
	out.println(s);
%>

 新建Include_Command.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<h1>Include指令</h1>
	<hr>
	<%@ include file="date.jsp"%>
</body>
</html>

运行结果： 

 

新建Include_Action,jsp：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<h1>Include指令</h1>
	<hr>
	<jsp:include page="date.jsp" flush="false"/>
</body>
</html>

 

 包含页面的内容（源代码），并且和主页面转换为同一个servlet（类）。

主页面与包含页面是两个独立的类。 

在这个类中并没有包含date.jsp的源代码，而是包含输出结果，相当于调用date.jsp，把它的输出结果打印输出。 

 

等同于服务器内部跳转方法。 

新建login.jsp：

<%@ 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>My JSP 'login.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>
    <h1>系统登录</h1>
    <hr>
    <form name="loginForm" action="Forward_Action.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="password" name="password"/></td>
        </tr>
        <tr>
          <td colspan="2"><input type="submit" value="登录"/></td>
        </tr>
      </table>
    </form>
  </body>
</html>

新建user.jsp：

<%@ 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>My JSP 'user.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>
    <h1>用户资料</h1>
    <hr>
    <%
    	request.setCharacterEncoding("utf-8");
    	String username="";
    	String password="";
    	if(request.getParameter("username")!=null)
    	{
    		username=request.getParameter("username");
    	}
    	if(request.getParameter("password")!=null)
    	{
    		password=request.getParameter("password");
    	}
    %>
        用户名：<%=username %><br>
        密码：<%=password %><br>
  </body>
</html>

新建Forward_Action.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<h1>Forward动作</h1>
	<hr>
	<jsp:forward page="user.jsp"/><%//相当于服务器内部跳转 %>
</body>
</html>

 

等价于服务器内部跳转方法：

Forward_Action.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<h1>Forward动作</h1>
	<hr>
<%-- 	<jsp:forward page="user.jsp"/><%//相当于服务器内部跳转 %> --%>
	<%
	request.getRequestDispatcher("user.jsp").forward(request,response);
	%>
</body>
</html>

结果效果一样。

 

给user.jsp传递了一个新的参数email：

新建dologin.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<jsp:forward page="user.jsp">
		<jsp:param value="admin@123.net" name="email"/>
	</jsp:forward>
	
</body>
</html>

user.jsp：

<%@ 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>My JSP 'user.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>
    <h1>用户资料</h1>
    <hr>
    <%
    	request.setCharacterEncoding("utf-8");
    	String username="";
    	String password="";
    	String email="";
    	if(request.getParameter("username")!=null)
    	{
    		username=request.getParameter("username");
    	}
    	if(request.getParameter("password")!=null)
    	{
    		password=request.getParameter("password");
    	}
    	if(request.getParameter("email")!=null)
    	{
    		email=request.getParameter("email");
    	}
    	
    %>
        用户名：<%=username %><br>
        密码：<%=password %><br>
	 电子邮箱：<%=email %><br>
  </body>
</html>

login.jsp：

<%@ 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>My JSP 'login.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>
    <h1>系统登录</h1>
    <hr>
    <form name="loginForm" action="dologin.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="password" name="password"/></td>
        </tr>
        <tr>
          <td colspan="2"><input type="submit" value="登录"/></td>
        </tr>
      </table>
    </form>
  </body>
</html>

dologin.jsp：

<%@ page language="java" import="java.util.*" contentType="text/html; charset=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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<jsp:forward page="user.jsp">
		<jsp:param value="admin@123.net" name="email"/>
		<jsp:param value="888888" name="password"/>
	</jsp:forward>
	
</body>
</html>

 

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