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Transactions - Java Struts: Developing a Finance Management Software – Part 6 | Java courses

In this tutorial, we will study 2 transactions inside our application. First, a Debit Transaction, that will serve as an opposite transaction to the Credit.

Course:  

Duration: 15 minutes

Summary: In this tutorial, we will study 2 transactions inside our application. First, a Debit Transaction, that will serve as an opposite transaction to the Credit. After this we will create a statement transaction, and set all the persistence inside the app. In this course, we’re going to learn the Java Struts 2 Technology, presenting a Tomcat Web solution and exploring how a Finance Management Software can be designed using these resources.

Technology Used: Java, Apache Struts 2, Eclipse, Tomcat

Keyword: Java, Eclipse, Struts 2, Tomcat, apache, mvc

Video Transcription:

Hello everybody and welcome. Let's continue our Struts Java course. Right now we're going to create another transaction, to complete our application map. As we have a credit action, we're going to create a debit action that will give an opposite effect to the credit operation. We're just going to change credits to debits and change this. After this we're just going to copy and past the credits.jsp file and we'll call it debits.jsp.

We're going to name this action debit, it's the same transaction, but with an opposite effect. And after that you have made the debit .jsp file we have to duplicate the credit action file, and set the name as deb action as you have here That too, will change the name of this [class] to deb action automatically. Now you have two transactions, debit and credit, and you cant test both inside your Struts.xml, you have the debit declaration and the credit declaration.

After this we'll create our third action and name it statement. You will use this statement transaction to see all of your operation inside the application. We're going have a statement transaction, to serve as a guide line and help us to see our transactions that we make inside the application. So we're going to cut this code, and we're going to set the statement. I will have to create the statement action, right here.

After doing this declaration inside the Struts .xml you have to create your transaction jsp file, your web jsp file. So let's do it, we're going to copy and paste this deb file and call this statement.jsp. Once you have this file, set it. You'll type as the title Statement, and we're going to set a bunch of tags to give a shape to our document inside the body of the text, you have to set a balance, label.

Here we're going to use a property tag. Property tags work using a value, and this value will be recorded, and sent by your action. Once you have the balance tag, that we will use it to give a number and presume numbers once, entered on application, after this we're going to list all movements, credits and debits that we made inside the finance application. We're going to call it] movements. We're going to set the [red] line, and you're going to insert an html table, normal, and set a bar there. Inside the table text we're going to use a [redder] tag. The [redder] tag has two sets that we can call value, and were going to call Var. Value will be used as our object that will act. If a collection and a var is the variable, use it inside of every loop pass. Inside data reader tag we're going to create some properties.

Those properties that we're going to use inside this loop operation. We're going to call this value Transactions, representing all transactions used, and the TRM variable, representing a single transaction. So you have the collection, and you have the single transaction. Then next step, we have to create this object, name it transactions, and we have to create a transaction object. We're going to have two objects. One for a single transaction, and a set of transactions named transactions.

So let's create the transaction class, we're going to call it transaction. Once we create this transaction we're going to fill this class with properties. First of all let's create an ID for identification. Let's create a date that's going to be part of this library. After this we're going to create a property named nature. Because we can have debit or credit operations, and a log variable called amount.

You see underlines on yellow and you have to create and settle for all these properties nature amount. Also you can create a constrictor for this class public transaction. I have an empty constrictor, and you can create a constrictor to help you view all the fields inside. Just filling with all the attributes that I have inside this class. So you fill all the attributes with the values passed inside the method, nature amount.

OK. Here you've got the class that we represent, values for class that you use inside all your applications. But after this, we must think how we are going to persist these values inside the application. In this tutorial we're going to start a simple way to persist those values. We're going to use the web session format, and I have a well done made class to use to persist this.

So let's create a class and named transactions. Inside this class we're going to persist all values. I have already made a code to do this job for me so I'm just copying the values to this class. It's very useful. Until that thing's working here, you have to copy this xword-core inside your reference libraries. Ince you have this done, you have to open the properties, then you go to Java root path,you have to make a new reference the library and call it xword-core, made it you have xword-core you have to know the thing's working here. So let's see how this object works. You have a map inside the session object, that will get this on your action contexts with the method name get session, and get the session of the TomCat, and help us to persist in information that we want. So I have a list here of transactional objects and I have three methods.

One to get all these transactions. One to set all, when I set the object inside my session. And an add, one I will add a single transaction to this object. It's a simple code, but I will not lose time explaining it line-by-line of my code. This code, we have to set our focus inside the Struts. Once you have this, we have to set how the statement will work inside the application. We will work on this in our next class. See you, thank you very much.



Is a Systems’ Analyst with more than 10 years of experience. He is consultor in Porto Alegre /RS, where he works with C#, Java, among others languages, in platforms of Windows and Linux. He uses .NET framework since the first Beta...

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