JSP内置对象
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
在页面中获取参数
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="utf-8"%>
<%String id=request.getParameter("id"); //获取id参数的值
String user=request.getParameter("user");//获取user参数的值
String pwd=request.getParameter("pwd");//获取pwd参数值
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>处理页</title>
</head>
<body>
id参数的值为:<%=id %><br>
user参数的值为:<%=user %><br>
pwd参数的值为:<%=pwd %>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>使用request对象获取请求参数值</title>
</head>
<body>
<a href="deal.jsp?id=1&user=">处理页</a>
</body>
</html>
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>结果页</title>
</head>
<body>
<%String message=request.getAttribute("result").toString(); %>
<%=message %>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
try{//捕获异常信息
int money=100;
int number=0;
request.setAttribute("result",money/number);//保存执行结果
}catch(Exception e){
request.setAttribute("result","很抱歉,页面产生错误!");//保存错误提示信息
}
%>
<jsp:forward page="deal.jsp"/>
</body>
</html>
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.net.URLEncoder" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>写入cookie</title>
<script type="text/javascript">window.location.href="index.jsp"</script>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String user=URLEncoder.encode(request.getParameter("user"),"utf-8");//获取用户名
Cookie cookie = new Cookie("mrCookie", user+"#"+new java.util.Date().toLocaleString());
cookie.setMaxAge(60*60*24*30);//设置cookie有效期30天
response.addCookie(cookie);//保存cookie
%>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.net.URLDecoder" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>通过cookie保存并读取用户登录信息</title>
</head>
<body>
<%
Cookie[ ] cookies = request.getCookies();//从request中获得Cookie对象的集合
String user = "";//登录用户
String date = "";//注册的时间
if (cookies != null) {
for (int i = 0; i < cookies.length; i++) {//遍历cookie对象的集合
if (cookies[i].getName().equals("mrCookie")) {//如果cookie对象的名称为mrCookie
user = URLDecoder.decode(cookies[i].getValue().split("#")[0]);//获取用户名
date = cookies[i].getValue().split("#")[1];//获取注册时间
}
}
}
if ("".equals(user) && "".equals(date)) {//如果没有注册
%>
游客您好,欢迎您初次光临!
<form action="deal.jsp" method="post">
请输入姓名:<input name="user" type="text" value="">
<input type="submit" value="确定">
</form>
<%
} else {//已经注册
%>
欢迎[<b><%=user %></b>]再次光临<br>
您注册的时间是:<%=date %>
<%
}
%>
</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>
<a href="show.jsp?name=张三&sex=男">解决中文乱码</a>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="java.net.URLDecoder" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>通过cookie保存并读取用户登录信息</title>
</head>
<body>
<%
Cookie[ ] cookies = request.getCookies();//从request中获得Cookie对象的集合
String user = "";//登录用户
String date = "";//注册的时间
if (cookies != null) {
for (int i = 0; i < cookies.length; i++) {//遍历cookie对象的集合
if (cookies[i].getName().equals("mrCookie")) {//如果cookie对象的名称为mrCookie
user = URLDecoder.decode(cookies[i].getValue().split("#")[0]);//获取用户名
date = cookies[i].getValue().split("#")[1];//获取注册时间
}
}
}
if ("".equals(user) && "".equals(date)) {//如果没有注册
%>
游客您好,欢迎您初次光临!
<form action="deal.jsp" method="post">
请输入姓名:<input name="user" type="text" value="">
<input type="submit" value="确定">
</form>
<%
} else {//已经注册
%>
欢迎[<b><%=user %></b>]再次光临<br>
您注册的时间是:<%=date %>
<%
}
%>
</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>
<a href="show.jsp?name=张三&sex=男">解决中文乱码</a>
</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>
name参数的值为:<%=new String(request.getParameter("name").getBytes("iso-8859-1"),"UTF-8") %><br>
sex参数的值为:<%=request.getParameter("sex") %>
</body>
</html>
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
获取客户端信息
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>使用request对象的相关方法获取客户端信息</title>
</head>
<body>
<br>客户提交信息的方式:<%=request.getMethod()%>
<br>使用的协议:<%=request.getProtocol()%>
<br>获取发出请求字符串的客户端地址:<%=request.getRequestURI()%>
<br>获取发出请求字符串的客户端地址:<%=request.getRequestURL()%>
<br>获取提交数据的客户端IP地址:<%=request.getRemoteAddr()%>
<br>获取服务器端口号:<%=request.getServerPort()%>
<br>获取服务器的名称:<%=request.getServerName()%>
<br>获取客户端的主机名:<%=request.getRemoteHost()%>
<br>获取客户端所请求的脚本文件的文件路径:<%=request.getServletPath()%>
<br>获得Http协议定义的文件头信息Host的值:<%=request.getHeader("host")%>
<br>获得Http协议定义的文件头信息User-Agent的值:<%=request.getHeader("user-agent")%>
<br>获得Http协议定义的文件头信息accept-language的值:<%=request.getHeader("accept-language")%>
<br>获得请求文件的绝对路径:<%=request.getRealPath("index.jsp")%>
</body>
</html>
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>首页</title>
</head>
<body>
<%response.sendRedirect("login.jsp"); %>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>用户登录页面</title>
</head>
<body>
<form name="form1" method="post" action="">
用户名: <input name="name" type="text" id="name" style="width: 120px"><br>
密 码: <input name="pwd" type="password" id="pwd" style="width: 120px"> <br>
<br>
<input type="submit" name="Submit" value="提交">
</form>
</body>
</html>
<%
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">
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<form id="form1" name="form1" method="post" action="session.jsp">
<div align="center">
<table width="23%" border="0">
<tr>
<td width="36%"><div align="center">您的名字是:</div></td>
<td width="64%">
<label>
<div align="center">
<input type="text" name="name" />
</div>
</label>
</td>
</tr>
<tr>
<td colspan="2">
<label>
<div align="center">
<input type="submit" name="Submit" value="提交" />
</div>
</label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
<%
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 'result.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="css/style.css">
</head>
<body>
<div align="center">
<%
String name = (String)session.getAttribute("name");//获取保存在session范围内的对象
String solution = request.getParameter("address");//获取用户输入的最想去的地方
%>
<form id="form1" name="form1" method="post" action="">
<table width="28%" border="0">
<tr>
<td colspan="2"><div align="center"><strong>显示答案</strong></div> </td>
</tr>
<tr>
<td width="49%"><div align="left">您的名字是:</div></td>
<td width="51%"><label>
<div align="left"><%=name%></div> <!-- 将用户输入的用户名在页面中显示 -->
</label></td>
</tr>
<tr>
<td><label>
<div align="left">您最喜欢去的地方是:</div>
</label></td>
<td><div align="left"><%=solution%></div></td> <!-- 将用户输入的最想去的地方在页面中显示 -->
</tr>
</table>
</form>
<p> </p>
</div>
</body>
</html>
<%
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 'session.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="css/style.css">
</head>
<body>
<%
String name = request.getParameter("name");//获取用户填写的用户名
session.setAttribute("name",name);//将用户名保存在session对象中
%>
<div align="center">
<form id="form1" name="form1" method="post" action="result.jsp">
<table width="28%" border="0">
<tr>
<td>您的名字是:</td>
<td><%=name%></td>
</tr>
<tr>
<td>您最喜欢去的地方是:</td>
<td><label>
<input type="text" name="address" />
</label></td>
</tr>
<tr>
<td colspan="2"><label>
<div align="center">
<input type="submit" name="Submit" value="提交" />
</div>
</label></td>
</tr>
</table>
</form>
<p> </p>
</div>
</body>
</html>
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>page对象各方法的应用</title>
</head>
<body>
<%! Object object; //声明一个Object型的变量 %>
<ul>
<li>getClass()方法的返回值:<%=page.getClass()%></li>
<li>hashCode()方法的返回值:<%=page.hashCode()%></li>
<li>toString()方法的返回值:<%=page.toString()%></li>
<li>与Object对象比较的返回值:<%=page.equals(object)%></li>
<li>与this对象比较的返回值:<%=page.equals(this)%></li>
</ul>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" isErrorPage="true"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>错误提示页</title>
</head>
<body>
错误提示为:<%=exception.getMessage() %>
</body>
</html>
pageEncoding="UTF-8" errorPage="error.jsp"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>使用exception对象获取异常信息</title>
</head>
<body>
<%
request.setAttribute("price","12.5元");//保存单价到request范围内的变量price中
float price=Float.parseFloat(request.getAttribute("price").toString());//获取单价,并转换为float型
%>
</body>
</html>
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%
request.setCharacterEncoding("GB18030");
String username=request.getParameter("username");
String pwd=request.getParameter("pwd");
if("mr".equals(username) && "mrsoft".equals(pwd)){
out.print("<script language='javascript'>alert('登录成功!');window.location.href='index.jsp';</script>");
}else{
response.sendRedirect("error.jsp");
}
%>
pageEncoding="GB18030"%>
<%
response.setHeader("refresh","30;URL=index.jsp");
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>错误提示页</title>
</head>
<body>
您输入的用户名或密码错误,请重新登录!
</body>
</html>
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>用户登录</title>
</head>
<body>
<form name="form1" method="post" action="deal.jsp">
用 户 名: <input name="username" type="text" id="username"> *<br>
密 码: <input name="pwd" type="password" id="pwd">*<br>
<input type="submit" name="Submit" value="登录">
<input name="Reset" type="reset" id="Reset" value="重置">
</form>
</body>
</html>
pageEncoding="GB18030"%>
<%
request.setCharacterEncoding("GB18030");
String author=request.getParameter("author"); //获取留言人
String content=request.getParameter("content"); //获取留言内容
String message="["+author+"]说:"+content+"<br>"; //组合留言信息
if(session.getAttribute("message")!=null){
message+=session.getAttribute("message").toString();
}
session.setAttribute("message",message); //将留言信息保存到session中
response.sendRedirect("index.jsp");
%>
pageEncoding="GB18030"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>签写留言信息</title>
<script language="javascript">
function checkNull(form){
for(i=0;i<form.length;i++){
if(form.elements[i].value == ""){ //form的属性elements的首字e要小写
alert("很抱歉,"+form.elements[i].title + "不能为空!");
form.elements[i].focus();//当前元素获取焦点
return false;
}
}
}
</script>
</head>
<body>
<%
if(session.getAttribute("message")!=null){
out.println(session.getAttribute("message").toString());
}
%>
<br><hr></hr>
<form name="form1" method="post" action="deal.jsp" onSubmit="return checkNull(form1)">
留言人:
<input name="author" type="text" id="author" size="30" title="留言人"><br>
留言内容:
<textarea name="content" cols="70" rows="10" title="留言内容" id="content"></textarea><br>
<input name="Submit" type="submit" value="签写留言">
<input name="Submit2" type="reset" value="重置">
</form>
</body>
</html>
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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