Score: 2. This comprehensive and user-friendly book is the first and maybe even the only starter-level work of its kind combining the naturally complimentary JSP, JSF and Tomcat Web technologies into one consolidated treatment for developers focusing on just Java Web application development and deployment. This book is examples-driven using practical, real-time e-commerce case studies and scenarios throughout.
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 you're forced to study. The fact is your brain craves novelty. It's constantly searching, scanning, waiting for something unusual to happen. After all, that's the way it was built to help you stay alive.
It takes all the routine, ordinary, dull stuff and filters it to the background so it won't interfere with your brain's real work--recording things that matter. How does your brain know what matters? It's like the creators of the Head First approach say, suppose you're out for a hike and a tiger jumps in front of you, what happens in your brain? Neurons fire. Emotions crank up. Chemicals surge. That's how your brain knows. And that's how your brain will learn Java. Head First Java combines puzzles, strong visuals, mysteries, and soul-searching interviews with famous Java objects to engage you in many different ways.
It's fast, it's fun, and it's effective. And, despite its playful appearance, Head First Java is serious stuff: a complete introduction to object-oriented programming and Java.
You'll learn everything from the fundamentals to advanced topics, including threads, network sockets, and distributed programming with RMI. And the new. 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. The variab value changes with each iter collection. An array of arrays? In this example, we put String arrays into an ArrayList, then make the ArrayList a request attribute.
The JSP has to loop through the ArrayList to get each String array, then loop through each String array to print the actual elements of the array. ArrayList ; movieList. Watch it! No fou r— ibutes like the other book tells you where to get the specs covered on the to which you can bind attr ses sio n, and application.
Tag scope exam. And imagine that members can also post comments, but non-member guests cannot. What if you want to do one thing if the condition is true, and a different thing if the condition is false? In other words, what if we want to show either one thing or the other, but nobody will see both? The first But now imagine this scenario: you have a car sales web site, and page asks the user what he you want to customize the headline that shows up on each page, based on a user attribute set up earlier in the session.
We are, after all, trying to sell him a car the pages that talk about and become obscenely wealthy. Now you can stop even if you do st cu it his in t drive insanely fast.
We have the best speed sensors of any car this size. But what if you want to set a value in a Map? What if you want to make a new entry in a Map? Or what if you simply want to create a new request-scoped attribute? Set comes in two flavors: var and target. The var version is for setting attribute variables, the target version is for setting bean properties or Map values.
Each of the two flavors comes in two variations: with or without a body. This happens even if start looking at pag e, a scope, it will Duck, or a Broccoli. Even attribute. Q: Why would I use the body version instead of the no-body version? 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.
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.
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,.
Covering Servlet 3. Provides real-world Web application development problems and practical solutions and hundreds of examples and sample code for Java Web developers who use JavaServer Pages or servlets, along with useful tips, techniques, tools, and shortcuts.
0コメント