jsp内置9个对象和4个作用域（一）
2017-03-06 22:13
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备注： jsp的forward跳转界面指令 ，地址不变
target.jsp的文件
pageContext对象，用的方法是：pageContext.setAttribute(“关键字”,”值”);和pageContext.getAttribute(“关键字”);
2.request对象。常调用的方法是request.setAttribute(“key”,”value”);
3.response对象的方法用于客户端跳转界面。地址改变response.sendRedirect(“index.html”);
4.session对象
5.application对象：
Cookie内容
程序猿的记录。。。
<%@ 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>Insert title here</title> </head> <body> <!-- 界面跳转到target.jsp--> <jsp:forward page="target.jsp"> <jsp:param value="123456" name="java"/> <jsp:param value="i love you" name="secret"/> </jsp:forward> </body> </html>
target.jsp的文件
<%@ 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>Insert title here</title>
</head>
<body>
<h1>服务器跳转到targe.jsp界面</h1>
java=<%=request.getParameter("java")%>
<br/>
secret=<%=request.getParameter("secret") %>
<br/>
</body>
</html>pageContext对象，用的方法是：pageContext.setAttribute(“关键字”,”值”);和pageContext.getAttribute(“关键字”);
<%@ 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>Insert title here</title>
</head>
<body>
<%
//设置两个page范围的数据（key，value）
pageContext.setAttribute("name","rocky");
pageContext.setAttribute("age", 10);
%>
<%
//取值
String name=(String)pageContext.getAttribute("name");
int age=(Integer)pageContext.getAttribute("age");
%>
<p>姓名：
<%= name %>
</p>
<p>
年龄：
<%= age %>
</p>
</body>
</html>2.request对象。常调用的方法是request.setAttribute(“key”,”value”);
<%@ 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>Insert title here</title>
</head>
<body>
<%
//设置两个值，格式分别是key----value;
request.setAttribute("boss", "宋江");
request.setAttribute("skill","money");
request.setAttribute("position",1);
%>
<%
//取值
String boss=(String)request.getAttribute("boss");
String skill=(String)request.getAttribute("skill");
int position=(Integer)request.getAttribute("position");
%>
<h1>boss is:
<%=boss%>
</h1>
<h2>his skill is<%=skill %></h2>
<h3>his position is <%=position %></h3>
<jsp:forward page="requestTarget.jsp"></jsp:forward>
</body>
</html>3.response对象的方法用于客户端跳转界面。地址改变response.sendRedirect(“index.html”);
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.* " %>
<!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>Insert title here</title>
</head>
<body>
<%
//客户端跳转界面，地址改变为index.html，重定向
response.sendRedirect("index.html");
%>
</body>
</html><!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <h1>hello.i miss you</h1> </body> </html>
4.session对象
<%@ 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>Insert title here</title>
</head>
<body>
<%
//设置两个值，格式分别是key----value;
session.setAttribute("Hero", "诸葛亮");
session.setAttribute("skill","wisdom");
session.setAttribute("position",1);
%>
<h1>session设置完毕</h1>
</body>
</html><%@ 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>Insert title here</title>
</head>
<body>
<%
//取值
String hero=(String)session.getAttribute("Hero");
String skill=(String)session.getAttribute("skill");
int position=(Integer)session.getAttribute("position");
%>
<h1>hero是：<%=hero %></h1>
<h1>他的技能是：<%=skill %></h1>
<h1>他的风云榜单是：<%=position%></h1>
</body>
</html>5.application对象：
<%@ 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>Insert title here</title>
</head>
<body>
<%
application.setAttribute("dream","enabled");
application.setAttribute("action","ing...");
%>
<p>application 设置完毕</p>
</body>
</html><%@ 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>Insert title here</title>
</head>
<body>
<%
//取值
String dream=(String)application.getAttribute("dream");
String action=(String)application.getAttribute("action");
%>
<p>我的梦想是：<%=dream %></p><br/>
<p>我的行动是：<%=action%></p>
</body>
</html>Cookie内容
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.util.*"%>
<!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>Insert title here</title>
<script type="text/javascript">
function resetValue(){
document.getElementById("userName").value="";
document.getElementById("pwd").value="";
}
</script>
<%
String userName=null;
String pwd=null;
Cookie[] cookies=request.getCookies();//浏览器自带的cookie
for(int i=0;cookies!=null &&i<cookies.length;i++){
if(cookies[i].getName().equals("userNameAndPwd")){
userName=cookies[i].getValue().split("-")[0];
pwd=cookies[i].getValue().split("-")[1];
}
}
if(userName==null){
userName="";
}
if(pwd==null){
pwd="";
}
%>
</head>
<body>
<form action="userLogin.jsp" method="post">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" id="userName" name="userName" value="<%=userName%>"/></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" id="pwd" name="pwd" value="<%=pwd %>" /></td>
</tr>
<tr>
<td>记住密码：</td>
<td><input type="checkbox" id="remember" name="remember" value="remember-me"/></td>
</tr>
<tr>
<td><input type="submit" value="登录"/></td>
<td><input type="button" value="重置" onclick="resetValue()"/></td>
</tr>
</table>
</form>
</body>
</html><!--userLogin.jsp文件-->
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="javax.servlet.http.*"%>
<!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>Insert title here</title>
</head>
<body>
<%
String userName=request.getParameter("userName"); // 获取用户名
String pwd=request.getParameter("pwd"); // 获取密码
String remember=request.getParameter("remember"); // 获取记住密码
if("remember-me".equals(remember)){
Cookie userNameAndPwd=new Cookie("userNameAndPwd",userName+"-"+pwd);
userNameAndPwd.setMaxAge(1*60*60*24*7); // cookie记录一个星期
response.addCookie(userNameAndPwd); // 保存cookie
System.out.println("设置Cookie成功");
}
response.sendRedirect("response03.jsp");
%>
</body>
</html>程序猿的记录。。。
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