forward

Why forward and redirect in grails don't stop initial action execution?

大城市里の小女人 提交于 2019-11-30 20:59:56
I read about forward and redirect in Grails and don't understant why the code bellow prints "foo". See: def bar = { redirect (controller: "public", action: "index") // same happens with forward println "foo" // prints this in console?? WHY? } In my opinion redirect/forward must skip current method execution... Is this a bug or I understand the concept wrong? Victor Sergienko Because these are just function calls - they can't exit from a calling function (your action). Just put return afterwards. 来源: https://stackoverflow.com/questions/5805535/why-forward-and-redirect-in-grails-dont-stop

浅谈Web开发中forward与redirect的区别

北慕城南 提交于 2019-11-30 18:55:36
Forward和Redirect代表了两种请求转发方式:直接转发和间接转发。直接转发就是由控制器来控制请求应该转发给那个信息资源。然后由这些信息资源处理请求,处理完以后还可能转发给另外的信息资源来返回给用户,这个过程就是经典的MVC模式;而间接转发有时也叫做重定向,它一般用于避免用户的非正常访问。区别在于: 1.从地址栏显示来说 forward是服务器请求资源,服务器直接访问目标地址的URL,把那个URL的响应内容读取过来,然后把这些内容再发给浏览器。浏览器根本不知道服务器发送的内容从哪里来的,所以它的地址栏还是原来的地址。 redirect是服务端根据逻辑,发送一个状态码,告诉浏览器重新去请求那个地址。所以地址栏显示的是新的URL。 2.从数据共享来说 forward:转发页面和转发到的页面可以共享request里面的数据。 redirect:不能共享数据。 3.从运用地方来说 forward:一般用于用户登陆的时候,根据角色转发到相应的模块。 redirect:一般用于用户注销登陆时返回主页面和跳转到其它的网站等。 4.从效率来说 forward:高。 redirect:低。 关于两者的本质区别,有以下几种解释: 解释一   一句话,转发是服务器行为,重定向是客户端行为。为什么这样说呢,这就要看两个动作的工作流程: 转发过程:客户浏览器发送http请求——web服务器接受此请求

Is it possible to forward or redirect from a servlet filter after the response has been committed?

瘦欲@ 提交于 2019-11-30 14:28:09
The logic is that the filter gets hit, the condition is not true, so it goes through the filter chain. After the response is committed, the filter gets hit, and the condition is now true (a request attribute was set). It goes in to execute the forward, but the page never forwards. I know this has something to do with the response being committed because I tested different logic where it forwards before it hits the chain for the first time, and it does forward successfully. public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,

转发(forward)和重定向(redirect)的区别

可紊 提交于 2019-11-30 13:23:44
转发与重定向是入门JavaWeb的一个知识点,也是许多面试JAVA的后台所会遇到的一道面试题,许多的视频教程对于转发与重定向的理解并不透彻。 在这里跟我一起探究转发与重定向的魅力吧。 用户向服务器发送Http请求,作为用户没办法直观感受到请求转发的存在,但是我们的数据都是经过请求转发之后才能到达用户端的。 我们脑子里先记住一个概念: 转发(forward)=直接请求转发(forward)、重定向(redirect)=间接请求转发(redirect) 然后我举一个我看到最直观地例子带着大家入门一下: 直接转发相当于:“A找B借钱,B说没有,B去找C借,借到借不到都会把消息跟A说” 间接转发相当于:“A找B借钱,B说没有,让A去找C借”,但是A不会跟B说A借到了。 上面的例子通俗易懂可以理解了吧 接下来用专业的术语 直接转发方式: 客户端和浏览器只发出一次请求,Servlet,HTML,JSP或其他的信息资源,由第二个信息资源响应该请求,在请求对象request中,保存的对象对于每个信息资源是共享的。 直接转发方式用的更多一些,是用控制器来控制请求应该转发给哪个信息资源,然后由这些信息资源处理请求,处理完以后还以为转发给另外的信息资源来返回给用户,这个过程就是典型的MVC模式。 代码: //Servlet里处理get请求的方法 public void doGet

firewalld防火墙

白昼怎懂夜的黑 提交于 2019-11-30 12:20:03
firewalld防火墙 firewalld简述 firewalld:防火墙,其实就是一个隔离工具:工作于主机或者网络的边缘 对于进出本主机或者网络的报文根据事先定义好的网络规则做匹配检测, 对于能够被规则所匹配的报文做出相应处理的组件(这个组件可以是硬件,也可以是软件): 主机防火墙 网络防火墙 功能(也叫表) filter:过滤,防火墙 nat:network address translation,网络地址转换 mangle:拆分报文,做出修改,在封装起来 raw:关闭nat表上启用的连接追踪功能 链(内置): PREROUTING INPUT FORWARD OUTPUT POSTROUTING 数据报文的流向 流入:PREROUTING --> INPUT 流出:OUTPUT --> POSTROUTING 转发:PREROUTING --> FORWARD --> POSTROUTING 各功能可以在哪些链上实现 filter: INPUT,FORWARD,OUTPUT nat:PREROUTING(DNAT),OUTPUT,INPUT,POSTROUTING(SNAT) mangle: PREROUTING,INPUT,FORWARD,OUTPUT,POSTROUTING raw:PREROUTING,OUTPUT 路由发生的时刻(PREROUTING

Forward declare a struct in Objective-C

|▌冷眼眸甩不掉的悲伤 提交于 2019-11-30 11:36:10
I'm creating a protocol, and one of the parameters to a method I'm defining is a CMTime* . I would like to forward declare CMTime as opposed to including it. However, I've tried @class CMTime and it complains that it is redefined elsewhere as a different type of symbol. Documentation says it's a struct. I've tried forward declaring it as struct CMTime; but it still is complaining that it doesn't know what it is. Any ideas what I'm doing wrong? A source compiled as ObjC has the same rules as C in this regard. A source compiled as ObjC++ has the same rules as C++ in this regard. @class MONClass;

What's the difference between RequestDispatcher.forward() and HttpServletResponse.sendRedirect()? [duplicate]

微笑、不失礼 提交于 2019-11-30 11:05:18
问题 This question already has answers here : RequestDispatcher.forward() vs HttpServletResponse.sendRedirect() (10 answers) Closed last year . What is the difference between RequestDispatcher 's forward() and HttpServletResponse 's sendRedirect() method? Can anyone explain with a example and best usage of these methods with a real time example? 回答1: Redirection is a type of response sent back to the client, whereas the forward delegation takes place completely on the server side and the result of

Why forward and redirect in grails don't stop initial action execution?

蹲街弑〆低调 提交于 2019-11-30 05:47:59
问题 I read about forward and redirect in Grails and don't understant why the code bellow prints "foo". See: def bar = { redirect (controller: "public", action: "index") // same happens with forward println "foo" // prints this in console?? WHY? } In my opinion redirect/forward must skip current method execution... Is this a bug or I understand the concept wrong? 回答1: Because these are just function calls - they can't exit from a calling function (your action). Just put return afterwards. 来源:

jsp学习:jsp学习阶段性总结2019.9.21

£可爱£侵袭症+ 提交于 2019-11-30 05:16:29
1 Jsp学习 2 jsp语法格式: 3 脚本程序:<% 代码片段 %> 4 jsp声明:<%! declaration; [ declaration; ]+ ... %> 5 表达式:<%= 表达式 %> 6 jsp注释:<%-- 该部分注释在网页中不会被显示--%> 7 jsp指令:<%@ directive attribute="value" %> 8 jsp行为:<jsp:action_name attribute="value" /> 9 10 <%= request.getParameter(“account”) %> 11 使用上面一条语句可以在表单中获取name为account的元素值,也就是account的具体值。 12 例:(学会在jsp页面使用java语句) 13 <%String account = request.getParameter("account"); 14 String password = request.getParameter("password"); 15 if(account.equals("qingjun")&&password.equals("123")) { %> 16 <jsp:forward page="ForwardTest_Success.jsp"></jsp:forward> 17 <% } else { %> 18

Forward or Backward Compatibility in Android?

穿精又带淫゛_ 提交于 2019-11-30 02:54:40
问题 I would like to know whether the Android provides any sort of compatibility i.e either forward or backward. It means as in Blackberry if develop an Application with JDE 4.2 then that application will work on any handset with OS 4.2 or higher which means it has forward compatibility. Is there anything similar in Android? Suppose I develop application with Android SDK 1.5 then will that application work on any handset having OS 1.5 or higher. Hope to get a reply soon. Thanks & Regards Sunil 回答1