request.jsp：
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%@ page import="java.text.*" %>
<%
String path = request.getContextPath();
%>
<!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>request内置对象</h1>
<%
request.setCharacterEncoding("utf-8");//解决中文乱码问题
request.setAttribute("password", "123456");
%>
<!--用户名返回的是一个值，用gerParameter，爱好返回的是一个字符串数组，用getParameterValues -->
用户名：<%=request.getParameter("username")%><br><br>
爱好:<%
if(request.getParameterValues("favorite")!=null){
String[] favorites = request.getParameterValues("favorite");
for(int i=0;i<favorites.length;i++)
{
out.println(favorites[i]+" ");
}
}
%>
<br><br>
密码<%=request.getAttribute("password") %><br><br>
协议类型：<%=request.getProtocol() %><br><br>
MIME类型：<%=request.getContentType() %><br><br>
主机名：<%=request.getServerName() %><br><br>
端口号：<%=request.getServerPort() %><br><br>
字符编码方式：<%=request.getCharacterEncoding() %><br><br>
请求文件长度：<%=request.getContentLength() %><br><br>
IP地址：<%=request.getRemoteAddr() %><br><br>
此地址的真实路径：<%=request.getRealPath("request.jsp") %><br><br>
上下文路径:<%=request.getContextPath() %><br><br>
</body>
</html>
reg.jsp：
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%@ page import="java.text.*" %>
<%
String path = request.getContextPath();
%>
<!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>用户注册</h1>
<form action="request.jsp" name="loginForm" method="post">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>爱好：</td>
<td>
<input type="checkbox" name="favorite" value="read"/>读书
<input type="checkbox" name="favorite" value="yujia"/>瑜伽
<input type="checkbox" name="favorite" value="fadai"/>发呆
</td>
</tr>
<tr>
<td>显示：</td>
<td colspan="2"><input type="submit" name="提交"/></td>
</tr>
</table>
</form>
<!-- 添加URL -->
<a href="request.jsp?username=张张">测试张张账号</a>
</body>
</html>
执行：
