getRequestDispatcher(String)

本文介绍如何使用RequestDispatcher对象来转发请求到另一个Servlet或JSP页面。通过设置正确的URL模式元素值,可以在同一个包结构中访问目标Servlet。文章还解释了如何指定路径以及转发请求到JSP页面的具体操作。

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RequestDispatcher

Returns a RequestDispatcher object that acts as a wrapper for the resource located at the given path.

 RequestDispatcher dispatch = request.getRequestDispatcher("/tes");

Here "/tes" represents the url-pattern element value of the servlet class.


<servlet-mapping>
    <servlet-name>Test</servlet-name>
    <url-pattern>/tes</url-pattern>
</servlet-mapping>

It represents the path of the servlet class. Since both the base as well as target servlet are in the same package structure by just specifying the url-pattern element value we will be able to access the target servlet.

We shouldn't specify the entire path like

 String str = "/WEB-INF/classes/com/example/posr/Test"

 RequestDispatcher dispatch = request.getRequestDispatcher(str);

To forward a request to a JSP page we use

 RequestDispatcher dispatch = request.getRequestDispatcher("/TestJspOne.jsp");
Here "/TestJspOne.jsp" the slash denotes the Jsp page is at the root of the application.
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