如何在使用javax.servlet.RequestDispatcher.include（）时将参数传递给.jsp文件？ [英] how to pass arguments to .jsp file when using javax.servlet.RequestDispatcher.include()?

问题描述

通过将传入的HttpRequest路由到以Java编写的Controller Servlet中，然后当Servlet完成时，使用.jsp文件渲染回View，我使用建模Web应用程序的Model / View / Controller样式。 （这是Rails风格。）

这样做需要在Controller Servlet的末尾有这样一行：

  getServletContext（）。getRequestDispatcher（/ Bar.jsp）。include（req，res）; 
  

主要问题是我想将参数传递给Bar.jsp，就像它是一个函数一样我在打电话。如果这是不可能的，我最终会在Bar.jsp的顶部放置大量Java，以找出Bar.jsp需要呈现的所有内容，这相当难看。

其他web框架提供了一种方法来实现这一点，所以似乎必须有一种方法可以用Servlets来实现。特别是我在Java Google App Engine中工作。

解决方案

您可以使用

  request.setAttribute（attributeName，attributeValue）; 
  

和其他jsp文件中可以使用的方法 getAttribute（）像这样

  request.getAttributeNames（）; 
 request.getAttribute（attributeName）; 
  

I'm using the Model/View/Controller style of building web apps by routing an incoming HttpRequest to a Controller Servlet written in Java and then when the Servlet is finished, having it render back a View using a .jsp file. (This is very much the Rails style.)

Doing this requires a line like this at the end of the Controller Servlet:

getServletContext().getRequestDispatcher("/Bar.jsp").include(req, res);

The main problem is I want to pass arguments to Bar.jsp just as if it were a function that I am calling. If this is not possible, I end up putting lots of Java at the top of Bar.jsp to find out everything that Bar.jsp needs to render itself, which is rather ugly.

Other web frameworks provide a way to do this, so it seems that there must be a way to do it with Servlets. In particular I am working in Java Google App Engine.

解决方案

you can use

request.setAttribute("attributeName",attributeValue);

and in other jsp file you can using methodgetAttribute() like this

request.getAttributeNames();
request.getAttribute("attributeName");

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