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Struts2 Framework Overview
- 2. Struts2 Reinventing Struts1 Wheel Ori Dar Consultant and Architect, AlphaCSP
- 8. Introduction::HelloWorld, Model public class HelloWorld { private String message = "Hello World. Time is: " ; public String execute () { message += new Date(); return "success" ; } public String getMessage() { return message ; } } action method returns a result code We don’t have to extend Action Boss … and no request, response in execute() Boss
- 12. Background ::S2 Vs. S1 Configuration Lifecycle Validation EL View binding Form binding Threading Servlet API Action Role Action Wildcards, annotations Independent via interceptors xml or annotations OGNL Value Stack Action JavaBean properties Instance per request Decoupled Model POJO (with execute) Struts2 Verbose Shared Action Form JSTL EL JSP mechanisms Action Form Single instance Dependant Controller Extends Action Struts1
- 18. Background :: Theme example < s:form action= "login" namespace= "/" validate= "true" > < s:textfield cssClass= "loginField" size= "25" key= "username" /> < s:password cssClass= "loginField" size= "25" key= "password" /> < s:submit value= "Login" cssClass= "button" align= "center" /> </ s:form > Xhtml theme generates table and validation feedback. No themes in Struts1 login.jsp
- 21. Features ::Action Configuration < action name= "listEmployees" class= "actions.model.Employee" method= "list" > < result name= "list" type= "dispatcher" >/WEB-INF/list.jsp</ result > </ action > result type the view technology (default value: “dispatcher” for rendering JSP) result name action method should return a matching result code string (default value: “success”) action method within action class (default value: “execute”) action class action name matched by a URL
- 25. Features ::Page flow 1 3 4 5 6 7 8 2
- 27. Features :: Form binding < s:form action= "login" validate= "true" namespace= "/" > < s:textfield cssClass= "loginField" key= "username" /> < s:submit key= "login" cssClass= "button" align= "center" /> </ s:form > login.jsp public class Login { private String username; public void setUsername(String username) { this . username = username; } } Login.java Form field parameters are injected into setter methods by the params interceptor