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"브라우저에서 빠르게 Java 실행" 예제를 통한 실용적인 Java-Wasm 변환 학습(Practical Java-Wasm Conversion Learning with "Running Java Quickly in the Browser" Example)

J코딩 2023. 5. 25. 10:05
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최신 웹 개발의 증가와 브라우저에서 더 빠르고 효율적인 코드 실행에 대한 필요성으로 인해 Java-to-WebAssembly(Java-Wasm) 변환이 상당한 관심을 받았습니다. WebAssembly를 사용하면 개발자가 고성능 코드를 브라우저에서 직접 실행할 수 있으므로 리소스 집약적인 애플리케이션에 이상적인 선택입니다. 이 블로그 게시물에서는 Java-Wasm 변환의 실용적인 측면을 살펴보고 브라우저에서 Java를 빠르게 실행하는 예를 제공합니다.

1. Java-Wasm 변환

Java-Wasm 변환에는 Java 바이트코드를 WebAssembly 호환 형식으로 변환하여 Java 응용 프로그램을 브라우저에서 실행할 수 있습니다. 이 변환 프로세스에서는 TeaVM 및 GraalVM과 같이 이 목적을 위해 특별히 설계된 도구 및 프레임워크를 사용해야 합니다. 이러한 도구를 사용하면 최신 브라우저에서 로드하고 실행할 수 있는 WebAssembly 모듈로 Java 코드를 컴파일할 수 있습니다.

2. 브라우저에서 빠르게 Java 실행

실용적인 Java-Wasm 변환을 설명하기 위해 브라우저에서 간단한 Java 프로그램을 빠르게 실행하는 예를 살펴보겠습니다. 주어진 숫자의 계승을 계산하는 Java 프로그램이 있다고 가정합니다. 이 프로그램을 WebAssembly 모듈로 변환하고 브라우저에서 실행하려고 합니다.

3. 개발 환경 설정

   1) Java-Wasm 변환에 필요한 도구와 종속성을 설정하여 시작하십시오. JDK(Java Development Kit), TeaVM 및 선택한 웹 서버를 설치합니다. WebAssembly를 지원하는 호환 가능한 웹 브라우저가 있는지 확인하십시오.
   2) Java 프로그램을 작성합니다.
   3) 숫자의 계승을 계산하는 Java 프로그램을 작성하십시오. 예를 들어 다음 Java 코드 스니펫을 고려하십시오.

public class Factorial {
    public static int calculateFactorial(int n) {
        if (n <= 1) {
            return 1;
        }
        return n * calculateFactorial(n - 1);
    }
}

4. Java를 WebAssembly로 변환

TeaVM을 사용하여 Java 코드를 WebAssembly 모듈로 컴파일하십시오. 터미널 또는 명령 프롬프트를 열고 Factorial.java가 포함된 디렉토리로 이동합니다. 다음 명령을 실행하여 WebAssembly 모듈을 생성합니다.

teavmcl -target wasm -main-class Factorial

이 명령은 TeaVM에 'Factorial' 클래스를 WebAssembly 모듈로 컴파일하도록 지시합니다.

5. 웹 페이지 설정

WebAssembly 모듈을 로드하고 실행할 HTML 파일(예: index.html)을 만듭니다. 다음은 간단한 HTML 구조의 예입니다.

<!DOCTYPE html>
<html>
<head>
    <title>Running Java in the Browser</title>
    <script src="teavm.js"></script>
</head>
<body>
    <h1>Running Java in the Browser</h1>
    <script>
        const request = new XMLHttpRequest();
        request.open('GET', 'factorial.wasm', true);
        request.responseType = 'arraybuffer';

        request.onload = function() {
            const bytes = request.response;
            const module = TeaV M.Module.load(bytes); 
            const instance = module.link({});
            const result = instance.exports.calculateFactorial(5);
            console.log("Factorial:", result);
        };

        request.send();
    </script>
</body>
</html>

위의 스크립트 섹션은 WebAssembly 모듈을 가져와 인스턴스화하고 예제 입력 값 5로 calculateFactorial 함수를 실행합니다. 그런 다음 결과가 콘솔에 인쇄됩니다.

6. 예제 실행

로컬 웹 서버를 시작하고 컴파일된 WebAssembly 모듈과 함께 index.html 파일을 제공합니다. Python의 내장 http.server를 사용할 수 있습니다.

With the rise of modern web development and the need for faster and more efficient code execution in the browser, the Java-to-WebAssembly (Java-asm) conversion has gained significant attention. WebAssembly allows developers to run high-performance code directly in the browser, making it an ideal choice for resource-intensive applications. In this blog post, we will explore the practical aspects of Java-Wasm conversion and provide an example of running Java quickly in the browser.

1. Java-Wasm Conversion

Java-Wasm conversion involves transforming Java bytecode into WebAssembly-compatible format, allowing Java applications to be executed in the browser. This conversion process requires the use of tools and frameworks specifically designed for this purpose, such as TeaVM and GraalVM. These tools enable the compilation of Java code into WebAssembly modules, which can then be loaded and executed by modern browsers.

2. Running Java Quickly in the Browser

To illustrate the practical Java-Wasm conversion, let's consider an example of running a simple Java program quickly in the browser. Suppose we have a Java program that calculates the factorial of a given number. We want to convert this program into a WebAssembly module and run it in the browser.

3. Set Up the Development Environment

   1) Start by setting up the necessary tools and dependencies for Java-Wasm conversion. Install Java Development Kit (JDK), TeaVM, and a web server of your choice. Make sure you have a compatible web browser that supports WebAssembly.
   2) Write the Java Program
   3) Create a Java program that calculates the factorial of a number. For example, consider the following Java code snippet

public class Factorial {
    public static int calculateFactorial(int n) {
        if (n <= 1) {
            return 1;
        }
        return n * calculateFactorial(n - 1);
    }
}

Save this code in a file named Factorial.java.

4. Convert Java to WebAssembly

Use TeaVM to compile the Java code into a WebAssembly module. Open your terminal or command prompt and navigate to the directory containing Factorial.java. Execute the following command to generate the WebAssembly module shell
Copy code

teavmcl -target wasm -main-class Factorial

This command tells TeaVM to compile the Factorial class into a WebAssembly module.

5. Set Up a Web Page

Create an HTML file, let's say index.html, that will load and execute the WebAssembly module. Here's an example of a simple HTML structure

<!DOCTYPE html>
<html>
<head>
    <title>Running Java in the Browser</title>
    <script src="teavm.js"></script>
</head>
<body>
    <h1>Running Java in the Browser</h1>
    <script>
        const request = new XMLHttpRequest();
        request.open('GET', 'factorial.wasm', true);
        request.responseType = 'arraybuffer';

        request.onload = function() {
            const bytes = request.response;
            const module = TeaV M.Module.load(bytes); 
            const instance = module.link({});
            const result = instance.exports.calculateFactorial(5);
            console.log("Factorial:", result);
        };

        request.send();
    </script>
</body>
</html>

The script section above fetches the WebAssembly module, instantiates it, and executes the calculateFactorial function with an example input value of 5. The result is then printed to the console.

6. Run the Example

Start a local web server and serve the index.html file along with the compiled WebAssembly module. You can use Python's built-in http.server

 

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