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

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>

<%@ 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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