Lisque persius interesset his et, in quot quidam persequeris vim. Interesset his et, in quot quidam persequeris vim, ad mea essent possim iriure. We can be a bit more flexible. Make sure that Tomcat has access to read the files in docBase. Serving static web pages This method also works for serving HTML web pages and can be a great way to serve unchanging web pages quickly from Tomcat without having to write any Java code.
A quick note about MIME types Tomcat serves the correct MIME type to the browser for static content when the type is obvious from the name of the file being served - for example steve. Terms of Use Lisque persius interesset his et, in quot quidam persequeris vim, ad mea essent possim iriure. Part I — Information MXapp collects and controls Persius interesset his et, in quot quidam persequeris vim, ad mea essent possim iriure.
XML files Deployment Descriptors [ weblogic. This way you can create a minimal and working web application for the weblogic application server and the same code can be used for Tomcat and JBoss, and there would be some little modifications may require for Websphere to make the same code to work. Once you have imported the Project, you can view the code and modify it and rebuild it and Deploy it to your local Application Server.
The Home Page of the application is common for all the application servers and it has a link hyperlink to reach the SnoopServlet. Dont Get confused by seeing a different URL welcome. We intentionally designed our SnoopServlet to invoke the welcome.
So the Snoop servlet here just invokes the welcome. Since the Servlet code is usually big, We have just given the main and primary function of servlet which is processRequest.
As said earlier, the welcome. Display what is inside the WAR file without Extracting. Reloading WARs is part of the servlet specification and is especially useful during development.
Support for reloading web apps varies from server to server. Normally, all that you have to do is drop a new WAR in place of the old one in the proper location e. Tomcat automatically reloads WAR files when they change them unless configured not to , so all you have to do is drop an updated WAR over the old one and it will redeploy it as necessary. In some cases, it may be necessary to restart the server to make all changes take effect.
When in doubt, shut down and restart. One of the finer points of writing a professional-looking web application is taking care to handle errors well. Nothing annoys a user more than getting a funny-looking page with some technical mumbo-jumbo error information on it when he expected the receipt for his Christmas present.
Through the web. At this time, there is no corresponding way to declare error pages or welcome files using annotations. Additionally, you can designate error pages based on Java exception types that may be thrown from the servlet. For example:. This declaration catches any IOException s generated from servlets in the web app and displays the ioexception.
In the Servlet 3. In fact, the container supplies several helpful pieces of information to an error-handling servlet, which the servlet can use in generating a response.
The information is made available in the form of servlet request attributes through the method getAttribute :. Attributes are like servlet parameters, except that they can be arbitrary objects. In this case, we are talking about attributes of the request. When a servlet or JSP or filter is invoked to handle an error condition, the following string attributes are set in the request:.
In the case of a status code, the attribute is an Integer representing the code. In the case of the exception type, the object is the actual instigating exception. Indexes for directory paths can be designated in a similar way.
Normally, when a user specifies a directory URL path, the web server searches for a default file in that directory to be displayed. The most common example of this is the ubiquitous index. If none of the specified welcome files is found, it is left up to the server to decide what kind of page to display. Servers are generally configured to display a directory-like listing or to produce an error message.
One of the most powerful features of web app deployment with the Servlet API is the ability to define declarative security constraints, meaning that you can spell out in the web. It is not necessary to write code in your servlets to implement these basic security procedures. There are two types of entries in the web. The following web.
It specifies the simplest form of login process: the BASIC authentication model, which causes the browser to prompt the user with a simple pop-up username and password dialog box:. We can do the equivalent configuration for a given servlet using the SecurityServlet annotation with an HttpConstraint annotation element as follows:.
You can add this annotation to our test servlet or add the XML example setup to the web. Access to protected areas is granted to user roles, not individual users. A user role is effectively just a group of users; instead of granting access to individual users by name, you grant access to roles, and users are assigned one or more roles.
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