forward

What is the difference between response.sendRedirect() and request.getRequestDispatcher().forward(request,response) [duplicate]

由 ☆樱花仙子☆ 提交于 2019-11-26 15:18:45
问题 This question already has an answer here: RequestDispatcher.forward() vs HttpServletResponse.sendRedirect() 10 answers I have got a problem with my page jump when I use JAVA, if I use: response.sendRedirect("login.jsp") then I get this url: http://localhost:8080/login.jsp But if I use request.getRequestDispathcer("login.jsp").forward(request, response) then I get this url: http://localhost:8080/Shopping/login.jsp (the "Shopping" is the name of my module). What's the difference? 回答1: To simply

第15课 完美转发(std::forward)

由 浪尽此生 提交于 2019-11-26 14:58:06
一. 理解引用折叠 　 （一）引用折叠 　　1. 在C++中， “引用的引用”是非法的 。像auto& &rx = x;（注意两个&之间有空格）像这种直接定义引用的引用是不合法的，但是编译器在通过类型别名或模板参数推导等语境中，会间接定义出“引用的引用”，这时引用会形成“折叠”。 　　2. 引用折叠 会发生在 模板实例化、auto类型推导、创建和运用typedef和别名声明、以及decltype语境中 。 （二）引用折叠规则 　　1. 两条规则 　　　　（1）所有 右值引用折叠到右值引用上仍然是一个右值引用 。如X&& &&折叠为X&&。 　　　　（2）所有的其他引用类型之间的折叠都将变成左值引用。如X& &, X& &&, X&& &折叠为X&。可见 左值引用会传染，沾上一个左值引用就变左值引用了 。 根本原因：在一处声明为左值，就说明该对象为持久对象，编译器就必须保证此对象可靠（左值） 。 　　2. 利用引用折叠进行万能引用初始化类型推导 　　　　（1）当万能引用（T&& param）绑定到左值时，由于万能引用也是一个引用，而左值只能绑定到左值引用。因此，T会被推导为T&类型。从而param的类型为T& &&，引用折叠后的类型为T&。 　　　　（2）当万能引用（T&& param）绑定到右值时，同理万能引用是一个引用，而右值只能绑定到右值引用上，故T会被推导为T类型

Spring forward with added parameters?

由 梦想与她 提交于 2019-11-26 12:59:19
问题 Is there a way to forward a request to another Controller while adding some parameter data to it? I tried adding to the ModelMap, but it doesn\'t seem to hang around. I am doing something like: return \"forward:/my-other-controller\"; Only other way I can think of is to put the parameters on the session and then pop them off in the target controller. 回答1: The simplest way is to add the data to the request. Since this is a forward, the same request is passed around to different handlers within

Difference between JSP forward and redirect [duplicate]

由 我是研究僧i 提交于 2019-11-26 10:19:22
This question already has an answer here: RequestDispatcher.forward() vs HttpServletResponse.sendRedirect() 10 answers Please explain the difference between jsp:forward and redirect . What is happening in each case? Bozho redirect sets the response status to 302 [1], and the new url in a Location header, and sends the response to the browser. Then the browser, according to the http specification, makes another request to the new url forward happens entirely on the server. The servlet container just forwards the same request to the target url, without the browser knowing about that. Hence you

C Programming: Forward variable argument list

由 随声附和 提交于 2019-11-26 06:39:17
问题 I\'m trying to write a function that accepts a variable number of parameters like printf, does some stuff, then passes the variable list to printf. I\'m not sure how to do this, because it seems like it would have to push them onto the stack. Something approximately like this http://pastie.org/694844 #include <stdio.h> #include <stdarg.h> void forward_args( const char *format , ... ){ va_list arglist; printf( format, arglist ); } int main (int argc, char const *argv[]){ forward_args( \"%s %s\

pytorch 调用forward 的具体流程

由 旧巷老猫 提交于 2019-11-26 04:31:57
forward方法的具体流程： 以一个Module为例： 1. 调用module的call方法 2. module的call里面调用module的forward方法 3. forward里面如果碰到Module的子类，回到第1步，如果碰到的是Function的子类，继续往下 4. 调用Function的call方法 5. Function的call方法调用了Function的forward方法。 6. Function的forward返回值 7. module的forward返回值 8. 在module的call进行forward_hook操作，然后返回值。 上述中“调用module的call方法”是指nn.Module 的__call__方法。定义__call__方法的类可以当作函数调用，具体参考Python的面向对象编程。 也就是说，当把定义的网络模型model当作函数调用的时候就自动调用定义的网络模型的forward方法。nn.Module 的__call__方法部分源码如下所示： def __call__(self, *input, **kwargs): result = self.forward(*input, **kwargs) for hook in self._forward_hooks.values(): #将注册的hook拿出来用 hook_result =

What is the difference between redirect and navigation/forward and when to use what?

由 ℡╲_俬逩灬. 提交于 2019-11-26 00:18:27
问题 What is difference between a navigation in JSF FacesContext context = FacesContext.getCurrentInstance(); context.getApplication().getNavigationHandler().handleNavigation(context, null, url); and a redirect HttpServletResponse response = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse(); response.sendRedirect(url); and how to decide when to use what? The issue with navigation is that page URL does not change unless faces-redirect=true is added to the

java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed

由 梦想与她 提交于 2019-11-25 21:47:23
问题 This method throws java.lang.IllegalStateException: Cannot forward after response has been committed and I am unable to spot the problem. Any help? int noOfRows = Integer.parseInt(request.getParameter(\"noOfRows\")); String chkboxVal = \"\"; // String FormatId=null; Vector vRow = new Vector(); Vector vRow1 = new Vector(); String GroupId = \"\"; String GroupDesc = \"\"; for (int i = 0; i < noOfRows; i++) { if ((request.getParameter(\"chk_select\" + i)) == null) { chkboxVal = \"notticked\"; }
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