Head first servlets and jsp 2nd edition download

How sessions work One problem Cookies The best part: the Container does virtually all the cookie work! What if I want to know whether the session already existed or was just created? We need another JSP element A comment EL: the answer to, well, everything. But wait The param attribute to the rescue But wait! It gets even better Trying to display the property of the property Expression Language EL saves the day!

How it runs Includes and imports can be messy Tag Files: like include, only better But how do you send it parameters? SkipPageException: stops processing the page SkipPageException shows everything up to the point of the exception But what happens when the tag is invoked from an included page?

We could just add more custom tag attributes But what if you DO need access to the body contents? A Tag can call its Parent Tag Find out just how deep the nesting goes Keep security out of the code! Who implements security in a web app? This tutorial will teach you how to use Java Servlets to develop your web based applications in simple and easy steps. Using Servlets, you can collect input from users through web page forms, present records from a database or another source, and create web pages dynamically.

But Servlets offer several advantages in comparison with the CGI. Servlets execute within the address space of a Web server.

It is not necessary to create a separate process to handle each client request. Java security manager on the server enforces a set of restrictions to protect the resources on a server machine.

So servlets are trusted. The full functionality of the Java class libraries is available to a servlet. It looks like they both do exactly the same thing. It might be a long and complex is page scope. If you put in a String look in the page scope space. A: We hear you. Once again, nobody asked US.

That feels wrong. But remember, set does a remove only when you pass in a null value. The answers are at the end of the chapter. The include directive use you do have different word for the attribu s ma kes sen se, wh en you think about it The imported chunk uses a reference to an image that is also on Server B. This is my horse. Welcome to our Web Services Support Group. How can you guarantee session tracking from a JSP He missed the point How can I get the session ID added to Ahhh It does URL rewriting automatically.

First we had to get the session either the existing one or a new one. The Container wants to use a cookie—it wants to include a unique cookie with the response, and then the client will send that cookie back with each subsequent request. Except one problem Then what? Query stringacpaes, for example, Uh-oh You can design a custom page to handle errors, then use the page directive to configure it. And what if I want a different error page depending on the error? You can declare error pages in the DD for the entire web app, and you can even configure different error pages for different exception types, or HTTP error code types , , etc.

That way you can show the client different error pages specific to the type of the problem that generated the error. Declaring a catch-all error page This applies to everything in your web app—not just JSPs. You can override it in individual JSPs by adding a page directive with an errorPage attribute. The object is type java. Throwable, so in a script you can call methods, and with EL you can access the stackTrace and message properties. This time, you getabmly details.

What if there are some errors I want to catch myself? The one that was actually thrown? But with web app error handling, remember, only officially-designated error pages get the exception object. It puts the exception object into the page scope, under the name you declare as the value of var. Inside the catch. If you bod y. The point is—learn catch or finally block. And on the exam, fooled. The JSTL is huge. Version 1. But nsformation e.

The XML tra give it the delimiter. We have a whole chapter the next one devoted to developing your own custom tag handlers. But the last part of this chapter is about how to use custom tags. What happens, for example, if someone hands you a custom tag library they created for your company or project? How do you know what the tags are and how to use them? You have to know how to figure out a tag even if the yo documentation is weak or nonexistent, and, eed to Everything you n one more thing—you have to know how to deploy a custom tag library.

Main things you have to know: know is in there. You can use any prefix you want, but the name comes from the TLD. The syntax includes things like required and optional attributes, whether the tag can have a body and if so, what you can put there , the type of each attribute, and whether the attribute can be an expression vs. The URI is what you put in your taglib directive. Besides the function we X M L s c hema that the It covers topics such as the JSF environment, validating input, controlling page navigation, working with tabular data, and developing custom renders and custom components.

JSP 1. Java Servlets 2. Tag libraries. Servlet filtering. The struts framework. JSP and JavaBeans. Web application architecture. Describes the features and capabilities of servlets and JavaServer Pages in building enterprise-class applications.

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