STRUTS 2 TUTORIAL FOR BEGINNERS WITH EXAMPLES PDF
Struts 2 Tutorial in PDF - Learn Struts 2 in simple and easy steps starting from basic to advanced concepts with examples including Basic MVC Architecture. Audience. This tutorial is designed for Java programmers who are interested to learn the basics of. Struts 2.x framework and its applications. Prerequisites. I use Struts Version and Tomcat ; see my homepage We starts with some basics about Struts: Go to the directory you extracted the Struts download.
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In this course we will learn how to create a Java based web application using the Struts 2 MVC framework to cleanly separate our views from. Java & Struts2 & Spring & Hibernate & Eclipse Tutorial. 1 .. the basics of creating a typical web application using Java. . TutorialFiles folder rather than just typing it or copying from this PDF, to save . This is a basic struts configuration. Struts Tutorial, basic, advanced & PDF learning Guides can understand from the Basics of Struts to Advanced Struts concepts like Struts Spring integration and .
Look at the following action mapping to under stand the concept. The word that matches for the first asterisk will be substituted for the method attribute. We can also substitute asterisk in the jsp pages. War file — Dynamic Method Invocation. In this tutorial we will use the previous tutorials example to implement the functionality of ActionError and ActionMessageclass.
Folder Structure Action Class The action class, do a simple checking to make sure that the username is not empty, if the userName is not valid then the action class set the error message with addActionError , if its valid then it set the successful message withaddActionMessage. The fielderror tag is a UI tag that renders field errors if they exist.
This method adds an error message for a given field to the corresponding jsp page. Here the error messages is added to each field individually using the addFieldError method. The error messages can either be specified in a separate property file or can be added directly in the Action class itself.
If userName and password are valid then a success message is added to actionMessage, the execute method get invoked, the jsp page get displayed based on execute methods returned value. We have done the coding such that If the username or password is empty , then the user will be forwarded to login. You might be interested to read: The action that will be invoked depends upon the namespace in which it is called. See this picture to understand how an URL matches to Struts 2 action namespace.
Final project structure 2. Namespace configuration Let us go through a Struts 2 namespace configuration example to know how it matches with URL and folder. JSP Pages File: Example 1 The URL: Given below is the genaralised url Http: You should break this struts. Multiple Struts configuration files In Struts 2, you should always assign each module a struts configuration file. In this case, you can create three files: For example to change the extension from. Article to read Next: When this setting is enabled, Struts 2 will provide additional logging and debug information, which can significantly speed up development.
By default, the development mode is disabled, because it has a significant impact on performance, since the entire configuration will be reloaded on every request. The development mode is only suitable in development or debugging environment. In production environment, you have to disable it. As It will caused significant impact on performance, because the entire application configuration, properties files will be reloaded on every request, many extra logging and debug information will be provide also.
Posted by Mohaideen Jamil on Feb 24, in Struts-2 0 comments In this tutorial we will learn how to use a JavaBean class as a property in struts 2 action. Consider a scenario, in which you have written an action class, which in turn has a JavaBean class as its property as shown below.
Action class HelloAction. Action; import com. Retrieving the JavaBeans property from action class to Jsp To refer the attributes of User class, we need to first get the User object and then access its properties. Since the attributes we refer in the jsp page belongs to the User object JavaBean object we need to go one level deeper to reference the attributes.
To refer the userName attribute of User class, the value of the name attribute in the s: In struts 2 there is a concept call Model objects, using which we can refer to the JavaBean objects attributes directly, instead of doing a deeper reference as shown in this example above. In our next article we will learn about struts 2 Model Objects which simplifies the amount of code written above via ModelDriven interface Zip file — JavaBean.
In this tutorial we will learn about Struts 2 support for model objects. The Model object is a simple JavaBean object, which will be available to action class directly from ValueStack, i.
To make a JavaBean object as a model object, our Action class should implement ModelDriven interface which forces the getModel method to be implemented. This method provides the model object to be pushed into the Value Stack. Here the getModel must be invoked earlier for populating its input properties with data from request parameters, To make sure that the model is available in Value Stack when input parameters are being set, the ModelDrivenInterceptor is configured for the Action in struts.
Bean Class Model Class File: When the form data is submitted to this action, it will transfers the form data into the user properties automatically. ModelDriven; import com. Since the model object to be pushed into ValueStack must not be null hence model must be initialized before returned by getModel method. We can use only one model object per action class Do read: On Clicking submit button without any value in textbox, then the application redirects to error page as shown.
The Struts 2 File UploadInterceptor is based on MultiPartRequestWrapper, which is automatically applied to the request if it contains the file element.
This String will store the actual name of the uploaded file not the HTML name In the action class you can get the file, the uploaded file name and content type by just creating getter and setters. The file upload interceptor also does the validation and adds errors.
Struts 2 Tutorial
These error messages are stored in the struts-messsages. The values of the messages can be overridden by providing the text for the following keys: The default value of this is 2MB. It allows you to specify the allowed content type. File; import com. This file will be stored some where in the metadata directory Note: In order to save the.
The problem with above code snippet is, you cannot see the uploaded file in the target folder. Also the file uploaded wont have any proper extension, instead it will have the extension as. Struts 2 — Upload File to Desire Folder Location So in-order to upload and save a file in target space and in-order to have a file with proper extension, i.
Posted by Mohaideen Jamil on Sep 28, in Struts 2 Tutorial, Struts-2 0 comments In my previous tutorial I have explained about how to upload file in struts 2 web application.
This article aims at overriding the default file upload error message which are added by file upload interceptor during file upload validation. These error messages are stored in the struts- messsages. In-order to override these message, you need follow the below steps. Create a global.
Add the constant In struts. File Download Example in Struts 2 Posted by Mohaideen Jamil on Sep 29, in Struts 2 Tutorial, Struts-2 2 comments This tutorial will help you understanding how to create a Struts 2 action class that allows users to download files from server to their local computer.
Now in the action class, we need to declare a variable with the same name along with getter and setter method. By this way we have configured the download file name dynamically. In addition to that, we must define an InputStream object which has the same name as the name specified by the inputName parameter in struts. All the variables must have appropriate getter methods.
File; import java. FileInputStream; import java. InputStream; import com. Properties file Two properties files to store the message. Action A simple Action class with a validation to make sure the username is not empty, otherwise return an error message. Demo http: Action LoginAction. Folder Structure: Action class HiddenAction. Action class TextAreaAction. Luckly struts2 has a build in functionality that prevents such scenarios: In order to prevent double submissions all we have to do is to add tag in the above form.
This tag will add a unique identifier in the form that will be used later from the token interceptor in order to check if the form is submitted for the first time or not. The s: Add struts2-dojo-plugin. Date; import com. Inorder to make this values appear in the result page, you just need to include the getter and setter for staticDateFromJsp and todaysDate in the action class, and render it via property tag in result.
As an alternative I found out a plugin Struts2- Jquery which provide a lots of customizing features. To create a date time pick component in struts 2, please follow this two steps: Add struts2-jquery-plugin Action class AutoCompleteAction. ArrayList; import com. You can create an instance of an object and either push it onto the ValueStack or set a top-level reference to it in the Action-Context.
Struts 2 Example
By default, the object will be pushed onto the ValueStack and will remain there for the duration of the tag.
In this tutorial let us learn how to use the Struts 2 Bean Tag with the help of a DollarConverter bean example. In this example we will convert dollars to rupees. Download It — BeanTag Example. Bean Class File name: We can use the bean tag in two ways.
By pushing the value onto the ValueStack. By setting a top-level reference to it in the ActionContext. Method 1 Hear we will see how we can do this by pushing the value onto the ValueStack. We do this using the following code in jsp. The param tag is used to set the dollar value. We now use the property tag to retrive the equivalent value in rupees. The DollarConverter bean will resides on the ValueStack till the duration of the bean tag. So its important that we use the property tag within the bean tag.
Method 2 Now we will see how we can do the same by creating a top-level reference to the bean in the ActionContext. We do this using the following code. Here our instance name is converter. Once we do this we can access the bean values outside the bean tag. Since the value is in the ActionContext we use the operator to refer it.
The value we pushed using push tag will be on top of the ValueStack, so it can be easily referenced using the first-level OGNL expression instead of a deeper reference. The following code show how to do this. Download It — PushTag 1.
Action package com. Bean A simple AuthorBean class, later will push it into the stack for easy access. Download It — Struts2Debug. You need to specify an id attribute for your url and you can also use actions instead of simple links in this tag.
Adding parameters to the url can be done by using the param tag. Create an image url. It always includes the execution of a stack of interceptors prior to and after the actual execution of the action itself.
This object encapsulates the action. This allows them to be aware of what is happening during the processing. In this post we will see how to create a simple interceptor that will execute and print a few lines to the server logs, both before and after an action is executed. An interceptor instance is created once and is reused over many requests.
Hence the interceptor code must be written to be thread safe. String intercept ActionInvocation invocation throws Exception method to provide your own implementation. Action Class Now lets create a dummy action class package action; import com.
ActionInvocation; import com. Demo On running the application, my Tomcat logs show the following: TheActionInvocation object is created by the struts framework and is used as a handle to the execution environment of the interceptor.
Since there are several interceptor defined in struts-default xml, the information of the sequence in which these interceptors are executed for the action is stored in the ActionInvocation object. The next interceptor in the sequence is called by calling the invoke method of the ActionInvocation object.
For the first Interceptor, the invoke method is called by the ActionProxy object. Here the String value returned by the invoke method in Interceptor is the value that is retrieved after the action have been executed.
I our next article we shall learn to implement an Login interceptor which can be used in a real time application. Login Interceptor in Struts 2 Posted by Mohaideen Jamil on Aug 5, in Struts-2 1 comment In our previous tutorial we have learned about concepts of interceptor and how interceptors gets execute before and after action class by creating a custom interceptor.
In this article we shall create a custom LoginInterceptor which could be used in real time struts 2 application This LoginInterceptor will perform these tasks: If someone try to access direct URL of welcome page and if he is not present in session then it will redirect towards login page. Map; import com. In the intercept method, we can make use of com. ActionInvocation i. Action Invocation object to get the action name trigger and decide on the further flow of application associated with it.
On the similar lines we can also make use of the org. ServletActionContext to get the request, response, session object etc. Map; import org. SessionAware; import com. Configuring the custom interceptors in struts. In web. Now once I hit logout link or if the session gets expired, then if the try to access the localhost: This tag can handle feature such as pagination, sorting and exporting of a table. In the following example we will see how to display data using display tag and to do pagination, sorting and exporting.
Download the Latest version of displaytag. ArrayList; import java. List; import com. ActionSupport; import com. How to make Struts 2 tag work inside Display tag? How to get checkbox values from displaytag using struts2 Displaytag export option is not working? Recommended reading: Here the problem is whenever we sort the table by clicking on any sortable column header it only sort the data visible in that page.
We can override this behavior by setting sort attribute in column to list as shown below.
A Quick Struts 2 Intro
Zip file — DisplayTagExample. For example: For this scenario, in a display tag, most of us result in the following code snippet. So the correct way of coding is: So the only way to access a struts 2 tag inside displaytag, is to follow the above syntax. To access a property tag inside display tag: How to get checkbox values from struts2 checkbox in displaytag to action class Posted by Mohaideen Jamil on Dec 25, in Display Tag, Struts 2 Tutorial, Struts-2 1 comment Consider a scenario, such that we have a list of items and each item can be selected by checking its checkbox.
If a submit button is clicked after selecting all necessary checkboxes. So now, in our Action class, we could get the values of checkboxes which had been selected, by which we can implement delete functionality. The following snippet of code is used to retrieve the value from a checkbox used inside displaytag. Displaytag export option is not working- Solution Posted by Mohaideen Jamil on Feb 18, in Java, Struts 1, Struts-2 2 comments In this article we will learn to resolve the issue which occurs while exporting the file using display tag, In order to enable export functionality in display tag, configure display tag in JSP as shown below.
My Application throws the following exception and error message, when user clicks on export button: TableTag] Unable to reset response before returning exported data. You are not using an export filter. Cause of Displaytag export problem: This issue occurs when you have declared filter in web. To fix displaytag export issue the following steps are needed to be followed: Add ResponseOverrideFilter filter as shown below.
Jsp Page Now, let us create a JSP page with two drop down lists, one contains values for countries and the other that is going to be populated with values for states based on the value selected in the first drop down list. This is done without a page refresh, by making AJAX calls to the Struts 2 action on first drop down list change event. Struts 2 In action class you need to create instance variables and its respective getter and setter methods.
Here the Data table will load the data by making an Ajax call. Since the response to be generated from the action class is of type JSON, So to handle it you need struts2-json-plugin Refer this article here for more detail. Download the csv file from which the data is to be read from here and place it under src folder, This files contains four columns — company, country, revenue, and year.
Project Structure Model class Create a model class that gets and sets the data from the four columns company, country, revenue, and year of the csv file.
InputStreamReader; import java. LinkedList; import java. List; import au. CSVReader; import com. RevenueReport; import com. As show in the image download the required library mentioned and place it in js and css folder of eclipse work-space, and refer these files in the head section in the jsp as shown below. Setup done from the browser perspective: It fields options are explained below: Title of the table.
It defines the field names that represent columns of the record. Note that the field name should exactly match the instance variable defined in the model class.
Demo On running the application i got the following response Since I have not handled any exception, so the message displayed in error box is empty. While debugging the error I found that the json response formed in struts application as below.
Hear the property names of jTable plugin are case sensitive. Along with the above keyword replace TotalRecordCount to totalRecordCount respectively, since this parameter will be used to display pagination count Which I will implement in upcoming tutorial Now on including action for create, update and delete in jsp page as below actions: In the above program I have not included the logic for create, delete and update functions.
The final project structure of this looks as below. Setup from the browser perspective: Now create a student table in Oracle database using the query below. On this table we are going to perform CRUD operation via ajax create table Student studentid int,name varchar 50 ,department varchar 50 , email varchar 50 ; CurdDao Create a class that performs CRUD operation in database package com.
Connection; import java. PreparedStatement; import java. ResultSet; import java. SQLException; import java. Statement; import java. DataAccessObject; import com. IOException; import java. CrudDao; import com. Student; import com. I have not created any request or response object in action class to get the student parameters, because those parameter from jsp file auto bounded to my struts 2 action, this is done via struts2-jquery- plugin.
One only requirement for this parameter to be passed from jsp is, you have create the member variable for those parameter in action class along with getters and setters as in above file.
Jtable Issue related to Struts 2 As mentioned in my previous article , the property names of jTable plugin are case sensitive. Along with the above keyword replace TotalRecordCount to totalRecordCount, since this parameter will be used to display pagination count Which I will implement in upcoming tutorial Model class Create Model class used in the controller, which will have getters and setters for fields specified in jTable script.
This is the third article on jQuery jTable plugin in Struts 2 that describes on how to implement pagination feature to do server side paging in struts 2 using the JQuery jTable plugin and it will not explain how to setup jTable plugin in struts 2 here.
This article will assume that the code for the integration of the jQuery JTable plug-in is implemented, and only the code required for implementing pagination in Struts 2 using jTable will be explained here. Setup As described above, the prerequisite for this code is that you integrate the jQuery jTable plugin into the Struts 2. You can find detailed instructions here, at JQuery jTable plugin in Struts 2, so now I am going to take the sample application I created for explaining AJAX based crud operations in jTable plugin and continue to implement paging for that application.
Download sample application from here and import the project in eclipse 2. Follow the steps in this article here to create table in database. Steps to enable Paging: From the browser perspective: You can also set pageSize option default value is 10 in jQuery Script code. Start index of records for current page. Count of maximum expected records. And it expects additional information from server: Total count of records.
Modify oracle query to fetch only a subset of records based on the jtStartIndex and jtPageSize. As mentioned above, jTable need TotalRecordCount to be present in the json response, For which add a member variable totalRecordCount in struts 2 action class and create getters and setters for the same. Method to get the count of total number of records in the result set.
In order to return only a subset of records according to the page offset jtStartIndex and jtPageSize , oracle query should be modified as follows, In case of Oracle database: Now on running the application, with the above changes, the final demo looks as shown below: First add the org. ContextLoaderListener to the web.
Spring Complete tutorial now available here. All the Struts 2 action configuration goes in the struts. HelloWorld class directly, we relate it using the bean name given in the spring bean configuration file. The HelloWorld class is shown below. In this page we dispaly the message value.
M3 org. The log4j. RollingFileAppender log4j. The article also provides an example project built with annotations and without having any struts configuration file that you can download and play around.
Struts 2 Result Path Configuration We can configure Struts 2 application to look for result pages at specific location, the article provide brief details about this using XML based configuration as well as annotation based.
Struts 2 Action Struts 2 Action Classes Action classes are at the front of our application and we invest a lot of time in designing and developing action classes. The article explains about four different ways to create action classes in Struts 2 framework. Learn about these ways and which is the good option to chose in your application action classes.
There are two approaches to achieve this — Object-backed and ModelDriven. The article explains about both of these approaches and which is the best approach to use. Struts2 Action Messages and Action Errors Example We can override ActionSupport validate method to have form field validation at server side and return the input page with action error messages to show in result pages. Similarly we can add action messages to show in result pages.
Struts 2 Interceptors Struts 2 Interceptor Tutorial with Custom Interceptor Example Struts2 interceptors are the backbone of the framework and defined in struts-default package. Struts2 interceptors are great example of Chain of Responsibility pattern implementation.
This article explains about the working of interceptors and how easily we can create our own interceptor and configure it for action. The article shows how we can achieve authentication across the application with the use of custom interceptors and make our code loosely coupled and achieve flexibility with code reuse.
Struts2 token interceptor We can use Struts2 token and tokenSession interceptors to handle multiple form submission problem at server side in the web application.
This article explains about these interceptors in detail with a working example. Struts2 execAndWait interceptor We can use Struts2 execAndWait interceptor to return an intermediate response page to client incase of long running action classes. Once the action class execution is finished, the final response is returned to the client. This article explains about execAndWait interceptor and how can we use this for long running action classes.
The article provide details about the usage of OGNL expressions and how we can create our own type converter classes. Struts2 Data Tags Struts2 comes with rich tags that can be categorized into data, control and UI tags.Login Interceptor in Struts 2 Posted by Mohaideen Jamil on Aug 5, in Struts-2 1 comment In our previous tutorial we have learned about concepts of interceptor and how interceptors gets execute before and after action class by creating a custom interceptor.
Bean Class Model Class File: Extracting Struts 2 download: Application specific constant like resource file, devMode, custom extension, theme settings also configured in this file. Action package com. Ade Ayo. To know more about Quartz please visit itsOfficial website.
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