Headfirst jsp servlets pdf download

All Users. If that's what you want to do, that is. Maybe you don't care about the exam, but need to use servlets. Learning a complex new language is no easy task especially when it s an object-oriented computer programming language like Java. You might think the problem is your brain. It seems to have a mind of its own, a mind that doesn't always want to take in the dry, technical stuff. A guide to JavaBeans provides more than two hundred questions and answers to help readers pass the Sun Certified Business Component Developer exam.

Architects of buildings and architects of software have more in common than most people think. You have helper classes. But how do you tie the pieces together? How do you let components share information? How do you hide information?

How do you make information thread-safe? Your job may depend on the answers. As soon as they send you a response, they forget who you are. But sometimes you need to keep conversational state with the client across multiple requests. You can write Java code in your JSP, but should you? And if not Java code, what do you write? How does it translate into Java code? Do your web page designers really have to know Java? Do they expect server-side Java programmers to be, say, graphic designers? But there are some traps Sometimes EL behaves differently than if you used the same syntax in Java, so pay attention!

Exam Objectives When attributes are beans Standard actions: useBean, getProperty, setProperty Can you make polymorphic bean references? What if you want to loop through the data in an array, and display one item per row in an HTML table? You know you could write that in two seconds using a for loop in a scriptlet. No problem. That way, your page designers can use your tag in their pages, while all the hard work is done behind the scenes in your tag handler class.

Of the three, two were introduced with JSP 2. Your pages are polished, your code is tested and tuned, and your deadline was two weeks ago. But where does everything go? So many directories, so many rules. What do you name your directories?

What does the client actually request, and how does the Container know where to look? Exam Objectives Key deployment task, what goes where? Trouble lurks in every corner of the network. Does Jim in marketing really need to know that Lisa in engineering makes three times as much as he does? And if you can intercept the request, you can also control the response. And best of all, the servlet remains clueless.

What does that mean to you? More vacations. Want to add user request tracking to every servlet in your app? Manipulate the output from every servlet in your app? Exam Objectives Hardware and software forces behind patterns Review of softweare design principles MVC Yes! This is it. We know. Sometimes you need more than EL or standard actions. The JSTL 1. Having access to 9. JSTL v1. URL-related: url. That means each web app needs a copy. I want to show one element per row in a table EL and standard actions are limited What happens when you bump into a brick wall?

Developers usually want way more standard actions or—even better—the ability to create their own actions. And you can. For the JSP page creator, custom tags are much easier to use than scripting. For the Java programmer, however, building the custom tag handler the Java code invoked when a JSP uses the tag is tougher. Still, there could be times when you need something from, say, a custom tag library developed specifically for your company.

What we need is a way to convert those angle brackets into something the browser will render as angle brackets, and there are two ways to do this.

A c:out tag without an escapeXML attribute is just the. She noticed that we were using EL everywhere to output strings entered by users. She said this was a security risk and recommended we output all user strings using the c:out tag. What gives? A: Your consultant was right. The security risk she is referring to is called cross-site hacking or cross-site scripting. The cracker includes viral JavaScript code in the comment. This previnterpreted by A: Good question. The c:out tag is smart, and it recognizes when the value is null and can perform a special action.

That action is to provide a default value Just add a default attribute, and provide the value you want to print if your expression evaluates to null: This value is output if the value attribute evaluates to null. Servlet code Mak e a St set the arrring[] of movie names, ay as a requ est attribuatnd e. This table has element in a ne per row. The trick is telling the table how many rows and columns you want.

The key feature is that the tag assigns each element in the collection to the variable you declare with the var attribute. Because Java 5. So learning the Head First way is more important than ever. If you've read a Head First book, you know what to expect--a visually rich format designed for the way your brain works.

If you haven't, you're in for a treat. You'll see why people say it's unlike any other Java book you've ever read. By exploiting how your brain. Both professions require attention to detail, and both practitioners will see their work collapse around them if they make too many mistakes.

It's impossible to imagine a world in which buildings get built without blueprints, but it's still common for software applications to be designed and built without blueprints, or in this case, design patterns.

A software design pattern can be identified as "a recurring solution to a recurring problem. But developers have had enough of books that simply catalog design patterns without extending into new areas, and books that are so theoretical that you can't actually do anything better after reading them than you could before you started. Rather than simply present another catalog of design patterns, the authors broaden the scope by discussing ways to choose design patterns when building an enterprise application from scratch, looking closely at the real world tradeoffs that Java developers must weigh when architecting their applications.

Then they go on to show how to apply the patterns when writing realworld software. Score: 3. Written for novice developers, this book provides an introductory course in web development for undergraduates as well as web developers. Covering Servlet 3. With comprehensive coverage and a lot of examples, this book is a guide to building real-world applications. You'll begin with an introduction to the Java Enterprise Edition and the basic web application, then set up a development application server environment, learn about the tools used in the development process, and explore numerous Java technologies and practices.

The book covers industry-standard tools and technologies, specific technologies, and underlying programming concepts. All Users. Similarly, the concept of time zones, locales and resource bundles are explained in detail before discussing JSTL and formatting tags. A separate chapter is dedicated to each of the four tag libraries—Core; SQL; XML; and formatting with detailed coverage of custom tags.