Integrating Servlets and JSP: The Model View Controller - Java ...

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Review: Beans• Java classes that follow certain conventions– (Must have a zero-argument (empty) constructor)• You can satisfy this requirement either by explicitlydefining such a constructor or by omitting all constructors• In this version of MVC, it is not required to have zero argconstructor if you only instantiate from Java code– Should have no public instance variables (fields)• I hope you already follow this practice and use accessormethods instead of allowing direct access to fields– Persistent values should be accessed through methodscalled getXxx and setXxx• If class has method getTitle that returns a String, classis said to have a String property named title• Boolean properties can use isXxx instead of getXxx12Bean Properties: ExamplesMethod Names Property Name Example JSP UsagegetFirstNamesetFirstNamefirstName${customer.firstName}isExecutivesetExecutive(boolean property)getExecutivesetExecutive(boolean property)getZIPsetZIPexecutiveexecutiveZIP${customer.executive}${customer.executive}${address.ZIP}Note 1: property name does not exist anywhere in your code. It is just a shortcut for the method name.Note 2: property name is derived only from method name. Instance variable name is irrelevant.13
Example: StringBeanpackage coreservlets;public class StringBean {private String message = "No message specified";public String getMessage() {return(message);}}public void setMessage(String message) {this.message = message;}• Beans installed in normal Java directory– Eclipse: src/folderMatchingPackage– Deployed: …/WEB-INF/classes/folderMatchingPackage• Beans (and utility classes) must always be in packages!14© 2012 Marty HallBasic MVC Design15Customized Java EE Training: http://courses.coreservlets.com/Java, JSF 2, PrimeFaces, Servlets, JSP, Ajax, jQuery, Spring, Hibernate, RESTful Web Services, Hadoop, Android.Developed and taught by well-known author and developer. At public venues or onsite at your location.
Page 4 and 5: Possibilities for Handling aSingle
Page 8 and 9: MVC Flow of ControlHTML or JSPJava
Page 10 and 11: Request Forwarding Example20public
Page 12 and 13: Request-Based Data Sharing• Servl
Page 14 and 15: ServletContext-Based DataSharing (R
Page 16 and 17: Bank Account Balances:Servlet Code3
Page 18 and 19: Bank Account Balances:Input Form…
Page 20 and 21: Bank Account Balances:High Balance4
Page 22 and 23: Summary44• Request scope- A new b
Page 24 and 25: Request-Based Sharing:Business Logi
Page 26: Comparing Data-SharingApproaches: S
Page 29 and 30: ServletContext-Based Sharing:Beanpa
Page 31 and 32: © 2012 Marty HallForwarding andInc
Page 33 and 34: Using RequestDispatcher.include:Set
Page 35: © 2012 Marty HallQuestions?JSF 2,

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