Windows application development in java

Note that the listed packages for –add-modules option should be separated by a comma with no spaces between them. The other options are responsible for compressing and removing files and other information that is not useful for software execution.

After performing these actions, the JRE will take around 30 mb instead of hundreds.

Creating a Windows service from any application

Java does not have standard services creation tools, so third-party tools were studied and WinSW has been selected because it is free and easy to use.

WinSW

WinSW is a utility that allows to start and wrap any process as a Windows service. In order to start working with it, you need to download executable and configuration files through this link https://github.com/kohsuke/winsw/releases.

Place these two files in the directory. Rename the executable file at your discretion and give the same name to the configuration file, then place the application’s jar file and the created JRE in this directory.

Write a minimum configuration in the configuration file:

  идентификатор службы имя Описание jre\bin\java.exe -jar application.jar 

jre\bin\java.exe – the relative path inside our folder to our JRE executable file.

After these actions, you can install the service by running the command as the administrator:

The list of commands is available here.

Interaction between Java and Windows API

To use Windows functions (such as creating a new process or adding registry keys) we used JNA in our application.

JNA (Java Native Access) provides Java software with easy access to libraries written in another language without writing anything but Java code. JNA allows calling directly native functions using natural Java method invocation. Most methods require no special handling or configuration; no boilerplate or generated code is required.

Connecting and working with JNA is very easy, you need to download the jar file or connect the dependency to a project builder, which is Maven in our case:

 net.java.dev.jna jna-platform 5.0.0 

In our project we used JNA to achieve the following goals: disable and enable the task manager 1) through the Ctrl+Shift+Esc combination, and 2) in the menu available by the Ctrl+Alt+Del combination.

To achieve these goals, we used the Advapi32Util class (an easy-to-use wrapping around the advapi32.dll library) and the WinReg interface with useful constants which provide functionality to make changes to the Windows registry (Figure 1. TaskManager class with enable() and disable() methods to modify the task manager registry keys).

Figure 1. TaskManager class with enable() and disable() methods to modify the task manager registry keys.

• Create a new process on behalf of a specific Windows user. For this purpose we used the CreateProcessAsUser() method of the Advapi32 interface. The following parameters should be transferred to the method:
  • hToken – a handle to the primary token that represents a user for whom we start the process.
  • lpApplicationName – the name of the module to be executed.
  • lpCommandLine – the command line to be executed.
  • lpProcessAttributes – a pointer to a SECURITY_ATTRIBUTES structure that specifies a security descriptor for the new process object and determines whether child processes can inherit the returned handle to the process.
  • lpThreadAttributes – a pointer to a SECURITY_ATTRIBUTES structure that specifies a security descriptor for the new thread object and determines whether child processes can inherit the returned handle to the thread.
  • bInheritHandles – if this parameter is TRUE, each inheritable handle in the calling process is inherited by the new process. If the parameter is FALSE, the processes are not inherited.
  • dwCreationFlags – the flags that control the priority class and create the process.
  • lpEnvironment – a pointer to an environment block for the new process. If the parameter is NULL, the new process uses the environment of the calling process. An environment block consists of a null-terminated block of null-terminated strings. Each string is in the following form: name = value \ 0.
  • lpCurrentDirectory – the full path to the current directory for the process. The string can also specify a UNC(universal naming convention) path.
  • lpStartupInfo – a pointer to a STARTUPINFO or STARTUPINFOEX.lpProcessInformation structure – a pointer to a PROCESS_INFORMATION structure that receives identification information about the new process.

Figure 2. A method for creating a new process for the specific Windows user.

Working with processes

For working and tracking processes on Windows, we used the ProcessHandle class added to Java 9. ProcessHandle allows receiving and make various manipulations with processes. In particular, when solving the task, it was required to collect PIDs of processes, filter processes based on the name and abort necessary processes.

Figure 3. ProcessHandler class with takeSnapshot() method for taking a snapshot of current processes and closeNewProcesses() method for termination of processes different from the snapshot.

Interaction with other system components

WebSocket

For Java there is a standard API for working with WebSocket.

 javax.websocket javax.websocket-api 1.1 provided 

But just the API was not enough, so one of its implementations Tyrus was chosen to run the code.

 org.glassfish.tyrus tyrus-server 1.14  org.glassfish.tyrus tyrus-container-grizzly-server 1.14 

Then you can create a minimalistic server and specify handlers (EndPoints).

 var server = new Server( "localhost", 8080, "/endpoints", null, EndPoint1.class, EndPoint2.class, . ); try < server.start(); Thread.currentThread().join(); >catch (Exception e) < log.error("Ooops! ", e); >finally

A handler skeleton is looking as follows:

@ServerEndpoint(value = "endpoint/url") public class SampleEndpoint < @OnOpen public void onOpen(Session session) throws IOException < // Called when a new connection is initialized >@OnMessage public void onMessage(Session session, Message message) throws IOException < // Called when a message from the client is received >@OnClose public void onClose(Session session) throws IOException < // Called when a connection is closed >@OnError public void onError(Session session, Throwable throwable) < // Called when errors appear >>

HTTP Client

The release of the 11th version of Java brought us a convenient HTTP client, so there is no need for third-party clients.

To create a client instance, you need to use a builder. In the simplest case:

var client = HttpClient .newBuilder() .build()

After that, you need to create a request, for example:

var request = HttpRequest.newBuilder() .uri(URI.create("https://myserver.com")) .timeout(Duration.ofMillis(1000)) .header("Content-Type", "application/json") .POST(bean.toJSON()) .build();

Then this request can be used for sending to the server:

var response = client.send(closeSession(sessionId, token), HttpResponse.BodyHandlers.ofString())

Conclusion

Due to the modular organization of Java 9 and higher, WinSW utility, updated Process API for interaction with operating system processes and JNA (Java Native Access) library, which provides Java programs with easy access to native libraries, we were able to create a Windows service using Java language which was also used for the server part implementation. As the result, this allowed us not to introduce a new language into the development process.

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How to Create a Windows Application in Java?

Step 1: Create a new Java Application. In Eclipse select File > New > Java Project:
Step 2: Create a new Frame. In Eclipse, right click the src folder and select New > Other.
Step 3: Build and fix compiler warnings.

Can we Make Windows Application Using Java?

You can use Eclipse to develop Java GUI/desktop applications for Windows. NetBeans is also an option.

How do I Run a Java Desktop Application?

Open a terminal window . On Microsoft Windows systems, you do this by choosing Start > Run, typing cmd in the Open field, and clicking OK.
Change directories to the PROJECT_HOME/dist folder using the cd command.
Type the following line to run the applications main class:

How do you Make a Desktop Application?

On the File menu , choose New and then choose Project.
In the New Project dialog box, in the left pane, expand Installed > Visual C++, then select Windows Desktop.
In the Windows Desktop Project dialog, under Application type, select Windows application .exe.

How do I Create a Java Application for my Desktop?

Downloading JDK.
Download the NETBEANS IDE and install it.
Applying Java Swing for creating user interfaces.
Start by creating a new project.
Adding components to the window.
Using properties box.
Structuring components on the window.
Making the components to perform actions.

How do I Create a Java Program?

of 07. Write the Java Source Code .
of 07. Save the File.
of 07. Open a Terminal Window.
of 07. The Java Compiler.
of 07. Change the Directory.
of 07. Compile Your Program.
of 07. Run the Program.

How do I Run a Java Program in Windows?

Open a command prompt window and go to the directory where you saved the java program MyFirstJavaProgram. java.
Type javac MyFirstJavaProgram.
Now, type java MyFirstJavaProgram to run your program.
You will be able to see the result printed on the window.

Build a Java Desktop Application — Full Course

Table of Contents

Windows Application Java Eclipse

Can we Make Windows Application Using Java?

How do I Run a Java Desktop Application?

How do you Make a Desktop Application?

How do I Create a Java Application for my Desktop?

How do I Create a Java Program?

How do I Run a Java Program in Windows?

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