forward

I have a header file port.h, port.c, and my main.c I get the following error: 'ports' uses undefined struct 'port_t' I thought as I have declared the struct in my .h file and having the actual structure in the .c file was ok. I need to have the forward declaration as I want to hide some data in my port.c file. In my port.h I have the following: /* port.h */ struct port_t; port.c: /* port.c */ #include "port.h" struct port_t { unsigned int port_id; char name; }; main.c: /* main.c */ #include <stdio.h> #include "port.h" int main(void) { struct port_t ports; return 0; } Many thanks for any

servlet跳转页面的几种方法 一直对Servlet的几种页面跳转方式，理解的糊里糊涂的，今天在网上搜了一把，找到一遍比较好的，记下来，以后看看。 跳转分两部分，一是发生在servlet，一是在JSP，其实JSP也就是servlet，不过还是有点差异滴。 Servlet： 当然，在servlet中，一般跳转都发生在doGet, doPost等方法里面。 1) redirect 方式 response.sendRedirect("/a.jsp"); 页面的路径是相对路径。sendRedirect可以将页面跳转到任何页面，不一定局限于本web应用中，如： response.sendRedirect(" http://www.ycul.com"); 跳转后浏览器地址栏变化。 这种方式要传值出去的话，只能在url中带parameter或者放在session中，无法使用request.setAttribute来传递。 2) forward方式 RequestDispatcher dispatcher = request.getRequestDispatcher("/a.jsp"); dispatcher .forward(request, response); 页面的路径是相对路径。forward方式只能跳转到本web应用中的页面上。 跳转后浏览器地址栏不会变化。 使用这种方式跳转

静态路由 如下图的实验： IP分配如下（掩码假设全为24位）,做实验的话使用iptables -F把所有的防火墙规则清空 1.1.1.0/24网段用vmnet1来模拟 2.2.2.0/24网段用vmnet2来模拟 3.3.3.0/24网段用vmnet3来模拟 4.4.4.0/24网段用vmnet4来模拟 vm1 vm2 vm3 vm4 eth1(vmnet2) eth0(vmnet2) eth1(vmnet4) 2.2.2.2 <------> 2.2.2.3 4.4.4.4 ip_forward ip_forward eth0(vmnet1) eth0(vmnet1) eth1(vmnet3) eth0(vnnet3) 1.1.1.1 ----> 1.1.1.2 3.3.3.3 <------ 3.3.3.4 sip:1.1.1.1 dip:4.4.4.4 返回 sip:4.4.4.4 dip:1.1.1.1 步骤一: 从1.1.1.1 ping 1.1.1.2 在宿主机上ping 1.1.1.2，能通 步骤二: ping 2.2.2.2 不能通 解决方法： 在vm1上加网关 route add default gw 1.1.1.2 步骤三: 在宿主机加了一个网关指向1.1.1.2的基础上，我再继续在宿主机上ping 2.2.2.3 不能通 解决方法： 在vm3上加网关指向2.2

#include <stdio.h> struct context; struct funcptrs{ void (*func0)(context *ctx); void (*func1)(void); }; struct context{ funcptrs fps; }; void func1 (void) { printf( "1\n" ); } void func0 (context *ctx) { printf( "0\n" ); } void getContext(context *con){ con=?; // please fill this with a dummy example so that I can get this working. Thanks. } int main(int argc, char *argv[]){ funcptrs funcs = { func0, func1 }; context *c; getContext(c); c->fps.func0(c); getchar(); return 0; } I am missing something here. Please help me fix this. Thanks. Try this #include <stdio.h> struct context; struct

Forward() : This can be done in two ways by Request & ServeletContext. Forwarding a request from a servlet to another resource (servlet, JSP file, or HTML file) on the server. Forward is done at server side, without the client's knowledge. When you invoke a forward request, the request is sent to another resource on the server, without the client being informed that a different resource is going to process the request. This process occurs completely with in the web container. Simply include: will include another file in our current file forward: will forward the current request to the

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? To simply explain the difference, response.sendRedirect("login.jsp"); doesn't prepend the contextpath (refers to the

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. 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 the server. As example, let's start with a simple setup of two controllers, one forwarding to the other: