ASP源码
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JSP源码
1.1 application
*在jsp中获得application对象
如:getServletContext().setAttribute("counter",new my***nt.Counter());
如:
1.2 request
*获取一个正在运行时的jsp/servlet文件的绝对url地址
Stringf fi***request.getRequestURL();
if(re***t.getQueryString()!=null{
file+='?'+re***st.getqueryString();
}
URL reconstructedURL=new URL(re***st.getScheme(),re***st.getServerName(),re***st.getServerPort(),file);
ou***rintln(re***structedURL.toString());
*获取客户端通过哪一个url访问本页面
String ca***age=request.getHeader("Referer");
*获取当前脚本在当疥文件系统中的真实路径
re***st.getRealPath(re***st.getServletPath());
*判断多个submit中的一个
在jsp中使用re***st.getParameter("sub");就可分辨
1.3 response
*网页重定向之三方法
(1)re***nse.sendRedirect(url);
(2)<%re***nse.setStatus(Ht***ervletResponse.SC_MOVED_PREMANENTLY);
String nowloc="/n***ath/index.htm";
re***nse.setHeader("Location",newloc);%>
(3)
注意上法只能在任何输出还没有发送到客户端之前使用这种方法
*禁用缓存
<%re***nse.setHeader("Cache-Control","no-store");
re***nse.setDateHeader("Expires",0);%>
1.4 session
*存活时间
<%se***on.setMaxInactiveInterval(300);%>
*注销
se***on.invalidate();
1.5 exception
*在jsp页面中处理Servlet的错误
protected void sendErrorRedirect(HttpServletRequest request,
HttpServletResponse response,String errorPageURL,Throwable e)
throws ServletException,IOException{
re***st.setAttibute("ja***.servlet.jsp.jspException",e);
getServletConfig().getServletContext();
getRequestDispatcher(errorPageURL).forward(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response){
try{
//
}
catch(Exception e){try{
sendErrorRedirect(request,response,"/j***ErrPage.jsp",e);
}catch(Exception e){e.***ntStackTrace();}
}
}
*在jsp页面中输出错误的stacktrace
(1)
<%@ page isErrorPage="true%>
<%
ou***rintln("
");");
printWriter pw***sponse.getWriter();
ex***tion.printStackTrace(pw);
ou***rintln("
<%
ex***tion.printStackTrace(new PrintWriter(out));
%>
1.6 Cookie
*设置cookie
<%
Cookie mycookie=new Cookie("aName","aValue");
re***nse.addCookie(mycookie);
//***ookie.setMaxAge(time);
%>