java에서 생성한 jar파일을 cmd가 아닌, java 안에서 실행시킬 수 있는 방법은 없나요?

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제목그대로 java의 jar파일을 cmd창이아니라 그냥 java main 안에서 실행시킬 수 있는 방법이 있는지 궁금합니다.

2 답변

  • 좋아요

    2

    싫어요
    채택 취소하기

    ProcessBuilder을 사용해보시길 추천드립니다.

    이렇게 사용하시면 될듯하고요.

    ProcessBuilder pb = new ProcessBuilder("/path/to/java", "-jar", "your.jar");
    pb.directory(new File("preferred/working/directory"));
    Process p = pb.start();
    
  • Oracle의 Java Tutorial에 있는 JarClassLoader를 사용하시면 어떨까 싶습니다.

    https://docs.oracle.com/javase/tutorial/deployment/jar/apiindex.html

    JarClassLoader.java

    /*
     * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     *
     *   - Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   - Redistributions in binary form must reproduce the above copyright
     *     notice, this list of conditions and the following disclaimer in the
     *     documentation and/or other materials provided with the distribution.
     *
     *   - Neither the name of Oracle or the names of its
     *     contributors may be used to endorse or promote products derived
     *     from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
     * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    import java.net.URL;
    import java.net.URLClassLoader;
    import java.net.JarURLConnection;
    import java.lang.reflect.Method;
    import java.lang.reflect.Modifier;
    import java.lang.reflect.InvocationTargetException;
    import java.util.jar.Attributes;
    import java.io.IOException;
    
    /**
     * A class loader for loading jar files, both local and remote.
     */
    class JarClassLoader extends URLClassLoader {
        private URL url;
    
        /**
         * Creates a new JarClassLoader for the specified url.
         *
         * @param url the url of the jar file
         */
        public JarClassLoader(URL url) {
            super(new URL[] { url });
            this.url = url;
        }
    
        /**
         * Returns the name of the jar file main class, or null if
         * no "Main-Class" manifest attributes was defined.
         */
        public String getMainClassName() throws IOException {
            URL u = new URL("jar", "", url + "!/");
            JarURLConnection uc = (JarURLConnection)u.openConnection();
            Attributes attr = uc.getMainAttributes();
            return attr != null ? attr.getValue(Attributes.Name.MAIN_CLASS) : null;
        }
    
        /**
         * Invokes the application in this jar file given the name of the
         * main class and an array of arguments. The class must define a
         * static method "main" which takes an array of String arguemtns
         * and is of return type "void".
         *
         * @param name the name of the main class
         * @param args the arguments for the application
         * @exception ClassNotFoundException if the specified class could not
         *            be found
         * @exception NoSuchMethodException if the specified class does not
         *            contain a "main" method
         * @exception InvocationTargetException if the application raised an
         *            exception
         */
        public void invokeClass(String name, String[] args)
            throws ClassNotFoundException,
                   NoSuchMethodException,
                   InvocationTargetException
        {
            Class c = loadClass(name);
            Method m = c.getMethod("main", new Class[] { args.getClass() });
            m.setAccessible(true);
            int mods = m.getModifiers();
            if (m.getReturnType() != void.class || !Modifier.isStatic(mods) ||
                !Modifier.isPublic(mods)) {
                throw new NoSuchMethodException("main");
            }
            try {
                m.invoke(null, new Object[] { args });
            } catch (IllegalAccessException e) {
                // This should not happen, as we have disabled access checks
            }
        }
    
    }
    

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