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How does struts work?

How does struts work?. Mohammad Seyed Alavi m.s.alavi@ece.ut.ac.ir. Document Map. User Interface. Source File. Memory Space. User. User’s scenario. First, look at this user scenario with home.jsp and time.jsp pages. Click to show time:. Click here. Click the link. Click to show time:.

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How does struts work?

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  1. How does struts work? Mohammad Seyed Alavi m.s.alavi@ece.ut.ac.ir

  2. Document Map • User Interface • Source File • Memory Space • User

  3. User’s scenario • First, look at this user scenario with home.jsp and time.jsp pages.

  4. Click to show time: Click here Click the link Click to show time: Click here Time is: 10:10:10 pm refresh

  5. Click the refresh link Time is: 10:10:10 pm refresh Time is: 10:11:11 pm refresh

  6. How does struts work? • Now, we want to show you how struts works in the background of this scenario. • But first, you must be familiar with some primitive symbols that will helps you through this tutorial.

  7. Primitives ObjectName Attr=value • Object Attr=value Attr=value ClassName ObjectName • Object maker object maker

  8. Primitives (cont.) Class.Method(args) ObjectName Attr=value • Method call Class.Method(args) ObjectName Attr=value • Method return Return value

  9. Now, let’s start it.

  10. 2.action class=“ “ 3.action method=“ “ 1 2 2.action=“ “ 3 home.jsp <%@ taglib prefix="s" uri="/struts-tags"%> <a href = ”<s:url action=” ”/>”> Click here </a> Find the action name from “home.jsp” file showTime showTime showTime Click to show time: Find the action class and action method from “struts.xml” Click here struts.xml <action name = “ ” class = “ ” method = “ ”> . . . MyTime MyTime currentTime currentTime

  11. action class=“MyTime“ action method=“currentTime“ 1 2 action=“showTime“ 3 An object of action class will be created if there is not any action object in the value stack There wasn't any action object so make a new one Value Stack MyTime 1 myTime object maker time = null myTime time = null

  12. action class=“MyTime“ action method=“currentTime“ 1 2 action=“showTime“ return value= 3 4 MyTime.currentTime() 1 2 Call the action method myTime time = null Return the return value MyTime.currentTime() myTime time = “10:10:10 pm” “OK” “OK”

  13. action class=“MyTime“ action method=“currentTime“ 1 2 action=“showTime“ return value=“OK” 3 4 Push the action object on top of value stack myTime time = “10:10:10 pm” Value Stack

  14. action class=“MyTime“ action method=“currentTime“ 1 2 action=“showTime“ return value=“OK” field=“ “ 3 4 5 struts.xml <action name=“showTime” …> <result name = “OK”> time.jsp </result> . . . </action> 3 4 Find the target page corresponding to return value from “struts.xml” time.jsp <%@ taglib prefix="s" uri="/struts-tags"%> Time is: <s:property value=” time ”/> Go to the result page time Time is: …………… refresh

  15. action class=“MyTime“ action method=“currentTime“ 1 2 action=“showTime“ return value=“OK” field=“time“ 3 4 5 Retrieve time property from action object Find the object from the top of value stack to initialize the result page (first object that has “time” property) MyTime.getTime() myTime Value Stack 1 5 myTime time = “10:10:10 pm” MyTime.getTime() Time is: …………… myTime refresh entrance_o 10:10:10 pm time = “10:10:10 pm” “10:10:10 pm” Name = “Mohammad”

  16. action class=“MyTime“ action method=“currentTime“ 1 2 action=“showTime“ return value=“OK” 3 4 Click the refresh link Time is: 10:10:10 pm refresh

  17. 2.action class=“ “ 3.action method=“ “ 1 2 2.action=“ “ 3 time.jsp <%@ taglib prefix="s" uri="/struts-tags"%> <a href = ”<s:url action=” ”/>”> refresh </a> Find the action name refreshTime refreshTime refreshTime from “time.jsp” file Find the action class and action method from “struts.xml” struts.xml <action name = “ ” class = “ ” method = “ ”> . . . MyTime MyTime refresh refresh

  18. action class=“MyTime“ action method=“refresh“ 1 2 action=“refreshTime“ 3 New request So, new value stack There wasn't any object so make a new one Value Stack MyTime 1 myTime object maker time = null myTime time = null

  19. action class=“MyTime“ action method=“refresh“ 1 2 action=“refreshTime“ return value= 3 4 MyTime.refresh() 1 2 Call the action method myTime time = null Return the return value MyTime.refresh() myTime time = “10:11:11 pm” “OK” “OK”

  20. action class=“MyTime“ action method=“refresh“ 1 2 action=“refreshTime“ return value=“OK” 3 4 Push the new object on top of value stack myTime time = “10:11:11 pm” Value Stack

  21. action class=“MyTime“ action method=“refresh“ 1 2 action=“refreshTime“ return value=“OK” field=“ “ 3 4 5 struts.xml <action name=“refreshTime” …> <result name = “OK”> time.jsp </result> </action> 3 Find the target page 4 corresponding to return value from “struts.xml” time.jsp <%@ taglib prefix="s" uri="/struts-tags"%> Time is: <s:property value=” time ”/> Find the name’s field Go to the result page time Time is: …………… refresh

  22. action class=“MyTime“ action method=“refresh“ 1 2 action=“refreshTime“ return value=“OK” field=“time“ 3 4 5 Retrieve time property from action object Find the object from the top of value stack to initialize the result page (first object that has “time” property) MyTime.getTime() myTime 1 Value Stack 1 5 myTime time = “10:11:11 pm” MyTime.getTime() Time is: …………… myTime refresh entrance_o 10:11:11 pm time = “10:11:11 pm” “10:11:11 pm” Name = “Mohammad”

  23. If there is some dark points in your mind, look at the second scenario! • If not, please report me about how much useful this document is. m.s.alavi@ece.ut.ac.ir

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