获取表单提交信息

通过request对象的getParameter()方法可以获取用户提交的表单信息。
例如存在一个name属性为username的文本框，在表单提价后，要获取其value值，可通过以下代码实现：
String userName=request.getParameter(“username”);
在这里插入图片描述

创建用户注册的表单页

<%@ 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>用户注册</title>
</head>
<body>

  	<form action="save.jsp" method="post">
    	<table height="150" width="300" align="center">
    		<tr>
   				<td align="center" colspan="4" height="20"></td>
   			</tr>
   			<tr>
   				<td align="center" colspan="4">用户注册</td>
   			</tr>
   			<tr>
   				<td>用户名：	</td>
   				<td>
   					<input type="text" name="name" />
   				</td>
   			</tr>
   			<tr>
   				<td>密码：	</td>
   				<td>
   					<input type="password" name="pwd" />
   				</td>
   			</tr>
   			<tr>
   				<td>确认密码：	</td>
   				<td>
   					<input type="password" name="pwd1" />
   				</td>
   			</tr>
   			<tr>
   				<td>性别：	</td>
   				<td>
   					<input type="radio" name="sex" value="m" checked/>男
   					<input type="radio" name="sex" value="f" />女
   				</td>
   			</tr>
   			<tr>
   				<td>年龄：	</td>
   				<td>
   					<input type="text" name="age" />
   				</td>
   			</tr>
   			<tr>
   				<td>Email：	</td>
   				<td>
   					<input type="text" name="email" />
   				</td>
   			</tr>
   			<tr>
   				<td>	</td>
   				<td>
   					<input type="submit" value="注 册" />
   				</td>
   			</tr>
   			<tr>
   				<td align="center" colspan="4" height="20"></td>
   			</tr>
   		</table>
   	</form>
</body>
</html>

创建sava.jsp页面，在该页面中获取用户提交的表单信息并显示在页面中

<%@ 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>
<%
request.setCharacterEncoding("UTF-8");
String name=request.getParameter("name");
String sex=request.getParameter("sex");
String age=request.getParameter("age");
String email=request.getParameter("email");
%>
<table height="150" width="300" align="center">
	<tr><td align="center" colspan="4" height="20"></td></tr>
	<tr><td align="center" colspan="4">获取表单信息</td></tr>
	<tr>
		<td>用户名：</td>
		<td>
			<%if(name==null||"".equals(name)){
				out.println();
			}else{
				out.println(name);
				}
			%>
		</td>
	</tr>
	<tr>
	<td>性别：</td>
	<td>
		<%
			if(sex==null||"".equals(sex)){
				out.println();
			}else{
				out.println(sex);
			}
		%>
		</td>
	</tr>
	<tr>
	<td>年龄：</td>
	<td>
		<%
			if(age==null||"".equals(age)){
				out.println();
			}else{
				out.println(age);
			}
		%>
		</td>
	</tr>
	<tr>
	<td>Email：</td>
	<td>
		<%
			if(email==null||"".equals(email)){
				out.println();
			}else{
				out.println(email);
			}
		%>
		</td>
	</tr>
	<tr><td align="center" colspan="4" height="20"></td>
	</tr>
</table>
</body>
</html>

获取表单提交信息

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