Selasa, 23 September 2008
Web.xml mapping servlet names improve web app's flexibility and security..The deployment descriptor (DD), provides a "declarative" mechanism for customizing your web applications without touching source code!
Tomcat Directory Structure
Login.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Login extends HttpServlet{
public void doGet(HttpServletRequest request,
HttpServletResponse response)throws IOException{
PrintWriter out=response.getWriter();
java.util.Date tody=new java.util.Date();
out.println("out put html tags");
}
}
<servlet>Maps internal name to fully-qualified class name.
<servlet-mapping>Maps internal name to public URL name.
web.xml
<servlet-mapping> which servlet should i invoke for this requested URL?
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd" version="2.4">
<servlet>
<servlet-name>Servlet_login</servlet-name>
<servlet-class>Login</servlet-class>
</servlet>
<servlet>
<servlet-name>Servlet_inbox</servlet-name>
<servlet-class>inbox</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Servlet_login</servlet-name>
<url-pattern>/signin.do</usr-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Servlet_inbox</servlet-name>
<url-pattern>/view.do</usr-pattern>
</servlet-mapping>
</web-app>
signin.do file mapping to Login.class. So the client or users to get to the servlet.. but it's a made-up name that is NOT the name of the actual servlet class.
Rating: 4.5
Reviewer: Unknown
ItemReviewed: Web.xml Deployment Descriptor
