By Budi Kurniawan
Java for internet with Servlets, JSP and EJB is the only ebook you must grasp Java net programming. It covers all of the applied sciences had to software internet purposes in Java utilizing Servlets 2.3, JSP 1.2, EJB 2.0 and client-side programming with javascript. those applied sciences are defined within the context of real-world tasks, similar to an e-commerce software, a record administration application, dossier add and programmable dossier obtain, and an XML-based on-line publication venture. as well as very good content material, this booklet contains licenses to 2 Java net parts from BrainySoftware.com. You obtain a whole license of the Programmable dossier obtain part for advertisement and non-commercial deployment. you're additionally granted to a license to install the authors renowned dossier add bean for non-commercial use, which has been authorized through the Fortune 500 corporation trade One and acquired by way of significant companies akin to Saudi company desktop, Ltd. and Baxter Healthcare company.
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Additional info for Java for the Web with Servlets, JSP, and EJB A Developer's Guide to J2EE Solutions
Example text
Sleep(6000); } catch (InterruptedException e) { } Now you have time to request the same servlet from the second browser. txt file. An inexperienced programmer would wonder whether a good solution might be to make every servlet implement the SingleThreadModel interface. The answer is no. If a servlet never accesses an external resource, queuing the second request will create unnecessary delay to the subsequent user after the first. Also, if the external resource is accessed but there is no need to update its value, you don't need to implement the SingleThreadModel interface.
After you get the ServletContext object, you can then use its getAttributeNames method to get an Enumeration of all attribute names and loop through it to obtain each attribute's value, which it outputs to the console along with the attribute name. getAttribute(attribute)); } To see the servlets work, first you need to call the AttributeSetterServlet servlet to set the attribute "password". You then call the DisplayAttributesServlet to get an Enumeration of the names of all attributes and display the values.
The scenario probably looks like this: 1. The service method executes Steps 1 and 2, and then gets distracted by the other request. 2. The method then does Step 1 from Bulbul before continuing to do Step 3 and 4 for Boni. What happens next? Boni and Bulbul get the same number, which is not how it is supposed to be. The servlet has produced an incorrect result. 13, the servlet is an unsafe multithreaded servlet. println("You are visitor number " + counter); } catch (Exception e) { } } } To solve the problem, remember the solution to the "playing dog" illustration: When the second dog waited until the first dog finished playing, both dogs could complete the game successfully.
Java for the Web with Servlets, JSP, and EJB A Developer's Guide to J2EE Solutions by Budi Kurniawan
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