有下面两段代码:pagel. jsp
< form action = "page2. jsp">
请您输人账号:<input name = "account" type = "text">< br>
请您输人密码:<input name = "password" type = "password"><br>
<input type = "submit" value = "登录">
</form >
pagez. jsp
く%
//获得表单中 name = account 的表单元素中输人的值,赋值给 str
String strl = request. getParameter (" account" );
String str2 = request. getParameter ("zhanghu" ) ;
%>
若不输入数据,直接单击“登录”按钮,则Strl 和 Str2 的值分别是( )。