需要使用JSP的内置作用域对象session。利用它的两个方法setAttribute()，getAttribute()
2.下面的这个实例实现了把第一个JSP页面的参数传递给第三个页面的功能
3.代码如下：1.jsp
<html>
<formmethod=get action=2.jsp>
what'syour name<input type=text name=username>
<inputtype=submit value=submit>
</form>
</html>
4.2.jsp
<html>
<formmethod=post action="3.jsp">
<%
Stringname=request.getParameter("username");
session.setAttribute("username",name);
%>
Yourname is:<%=request.getParameter("username")%>
<br>
what's your hobby<input type=textname=hobby>
password<input type=textname=password>
<inputtype=submit value=submit>
</form>
</html>
5.3.jsp
<html>
yourname is:<%=session.getAttribute("username")%>
<br>
yourhobby is:<%=request.getParameter("hobby")%>
yourpassword is:<%=request.getParameter("password")%>