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Tutorials > Servlet > Servlet URL Mapping

Servlet URL Mapping

URL mapping is an important concept in Servlets that allows you to map incoming HTTP requests to specific Servlets or JSPs based on their URLs. This makes it possible to organize your web application into logical units and handle different types of requests with different Servlets or JSPs.

Here's an example of how to use URL mapping to map incoming requests to a Servlet:

java
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@WebServlet("/myservlet")
public class MyServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // Servlet code
    }
}

In this example, the @WebServlet annotation is used to map incoming requests with the URL "/myservlet" to the MyServlet class. When a client sends an HTTP request to this URL, the Servlet container will instantiate an instance of the MyServlet class and call its doGet() method to handle the request.

Here's another example that demonstrates how to use wildcard mapping to map multiple URLs to a single Servlet:

java
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@WebServlet("/products/*")
public class ProductServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // Servlet code to handle product requests
    }
}

In this example, the @WebServlet annotation is used to map all URLs that start with "/products/" to the ProductServlet class. For example, requests to "/products/books", "/products/electronics", and "/products/clothing" will all be mapped to the same Servlet, which can use the request path information to determine the specific product being requested.

You can also use the web.xml deployment descriptor file to define URL mappings for your Servlets. Here's an example:

php
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<servlet>
    <servlet-name>MyServlet</servlet-name>
    <servlet-class>com.example.MyServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>MyServlet</servlet-name>
    <url-pattern>/myservlet</url-pattern>
</servlet-mapping>

In this example, the <servlet> element defines a Servlet named "MyServlet" and its class, and the <servlet-mapping> element maps the Servlet to the URL "/myservlet".

URL mapping is an important concept in Servlets that allows you to organize your web application and handle different types of requests with different Servlets or JSPs. By using the appropriate URL mapping techniques, you can build powerful and flexible web applications that can handle a wide variety of requests.



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