第六章JSP内置对象.docx

【5.5.2 jsp:forward】 jsp:forward 用于将一个JSP的内容传送到page所指定的JSP程序或者servlet去处理。 格式： jsp:forward page=”URL” flush=”true”/ jsp:forward page=”URL” flush=”true” jsp:param name=”paramname” value=”paramvalue”/ /jsp:forward 【forward.jsp】 html head titleForward Example/title /head !--最终显示的是forforward.jsp中的内容-- body bgcolor=red Welcome to forward.jsp %--直接跳转到forforward.jsp，这两个jsp用的是同一个request--% jsp:forward page=forforward.jsp / /body /html 【forforward.jsp】 html head titleforforward.jsp/title /head body bgcolor=blue Welcomebr Here is forforward.jsp /body /html 测试，在地址栏输入 HYPERLINK http://localhost:8080/servlet_example1/forward.jsp http://localhost:8080/servlet_example1/forward.jsp，页面显示为 注意页面的内容是forforward.jsp的内容，但是地址栏仍然是forward.jsp。 用处：登录之后根据登录情况跳转到相应的页面。 【练习1】 【forward1.jsp】 html head titleForward Example/title /head body bgcolor=red Welcome to forward1.jsp jsp:forward page=forforward1.jsp jsp:param name=name value=m / jsp:param name=oldName value=%= request.getParameter(name)% / jsp:param name=roles value=manager / /jsp:forward /body /html 【forforward1.jsp】 html head titleforforward1.jsp/title /head body bgcolor=blue Welcomebr Here is forforward1.jspbr %= request.getParameter(name)% %= request.getParameter(oldName)% %= request.getParameter(roles)% %= request.getParameter(address)% /body /html 测试，在地址栏输入： HYPERLINK http://localhost:8080/servlet_example1/forward.jsp http://localhost:8080/servlet_example1/forward.jsp，显示  HYPERLINK http://localhost:8080/servlet_example1/forward.jsp?name=zhangsan http://localhost:8080/servlet_example1/forward.jsp?name=zhangsan，显示  HYPERLINK http://localhost:8080/servlet_example1/forward.jsp?address=jinan http://localhost:8080/servlet_example1/forward.jsp?address=jinan，显示 jsp:f