Java C13. Struts pptx

struts- Execute the authentication processing by calling a corresponding Action class LoginAction.. Making JSP file for displayHtml tag library Tag that execute Struts own execution Bea

Chapter 13 StrutsITSS Java Programming Ngo Hong Son, HUT

Processing of screen control framework

Response

Typical screen control framework

Process(JCP)

When framework is not used (1)

public class ControllerServlet extends HttpServlet {

protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException { try {

}

}

When framework is not used (2)

1 Acquire the request parameter

2 Decide transition destination’s screen according to request parameter

3 Transfer to the transition destination‘s screen

When framework is used

Struts description

using Servlet and JSP

storage of data, screen transition control, etc

file (struts-config.xml)

 Change the language displayed on the client side

by the browser's language setting

Struts components

ActionServlet class

the form class and the action class

corresponding to the request

Configuration file (struts-config.xml)

according to the request

the object screen of processing result.

Form Bean (Action form class)

form and the link

JSP file for display

JSP, and Struts.

Action class

the Struts

call the method.

Operation principle of Struts (1)

Operation principle of Struts (2)

 Screen (loginForm.jsp) is displayed to the client

 Login: the ActionServlet will be called

 ActionServlet refers the configuration file config.xml)

(struts- Execute the authentication processing by calling a corresponding Action class (LoginAction)

 Decides the JSP of the transition destination,

according to the result authenticated

 The ActionServlet refers to the configuration file, and selects the transition destination's JSP

 Returns the client the screen of the processing

result

Making class based on framework

Procedure of Struts application

Registration to struts-config.xml

<?xml version="1.0" encoding="Shift_JIS"?>

<!DOCTYPE struts-config PUBLIC

"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"

<forward name="success" path="/jsp/loginSuccess.jsp" />

<forward name="error" path="/jsp/loginError.jsp" />

Definition of form Bean class

Definition of Action class

Making JSP file for display

Html tag library Tag that execute Struts own execution

Bean tag library Tag that acquire and display Bean property and

variable

Logic tag library Tag that execute processing such as repetition

or branching

TLD file Xml form file that defines use of custom tag, in

struts, struts-html.tld and struts-bean.tld and

so on are prepared

Login sample program

Outline

Hello Struts

Select [File] – [New] – [Project]

Hello Struts

Select [Tomcat project] in [New project] window, and click on [Next] buttonName project blank ->

Finish

Libraries to import

Find them in the lib directory of Struts-2

package

How to import jars?

Hello Struts

Import or edit files:

struts.xmlweb.xmlHelloWorld.javaHelloWorld.jsp

Find them on tutorial pages of struts 2 packages

struts.xml

web.xml

HelloWorld.java

HelloWorld.jsp

You got it!

How it works?

Login example

Sample program for Struts login processing

Select [File] – [New] – [Project]

Sample program for Struts login processing

Select [Tomcat project] in [New project] window, and click on [Next] button

Sample program for Struts login processing

Give the following project name in [New Tomcat project] window,

and click the [Finish] button Project name: LoginExample

Sample program for Struts login processing

Confirm that the “LoginExample” project is

created in the “Package Explorer” view

Sample program for Struts login processing

Right-click [LoginExample project],

and select [Import]

Sample program for Struts login processing

Select [File System] on [Import] screen,

and click on [Next] button

Sample program for Struts login processing

Click on [Tomcat run] button

Start Tomcat Stop Tomcat Restart Tomcat

Sample program for Struts login processing

Verify with the "Console" view that Tomcat

is started

Run it now

How it work

Logon.jsp

(1)

Action Servlet

Success.jsp Logon.jsp

<package name="tutorial" extends="struts-default">

<action name="Logon" class="tutorial.Logon">

<result name="input"> /Logon.jsp</result>

<result type="redirectAction">Success </result>

<html>

<head><title>Dang nhap thanh cong</title></head>

<body>

<h3> Chuc mung ban da thanh cong </h3>

<a href="Logon"> Quay tro lai trang ban dau </a>

</body>

</html>

Logon.java (1)

package tutorial;

import com.opensymphony.xwork2.ActionSupport; public class Logon extends ActionSupport {

public String execute() throws Exception {

if (isInvalid(getUsername())) return INPUT;

if (isInvalid(getPassword())) return INPUT;

Logon.java (2)

private String username;

public String getUsername() {

private String password;

public String getPassword() {

Validator functions

User doing validation

Struts does it for you

Input to be

validated Defined by struts

Validation registration by

xml files

Client-side validation

Basic steps for validation

Create the form

Create the Action class

Create the validation.xml

Example: Step 1

Results

Tips: To avoid validation fire at the beginning

<struts>

<package name="" extends="struts-default">

<action name="Basic_*" method="{1}" class="QuizAction">

Hand-on exercices

defined by students)

Hand-on exercises