Gets main class from jar manifest - Java Reflection

Java examples for Reflection:Jar

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Description

Gets main class from jar manifest

Demo Code


//package com.java2s;
import java.util.Map;
import java.util.jar.JarFile;
import javax.swing.JOptionPane;

public class Main {
    /**/*w  w  w.j  a  v a2 s  .  co m*/
     * Gets main class from jar manifest
     * @param jar
     * @return
     */
    public static String getMainClass(JarFile jar) {
        try {
            Map<Object, Object> map = jar.getManifest().getMainAttributes();

            String mainClass = null;

            for (Object obj : map.keySet()) {
                if (obj.toString().equalsIgnoreCase("main-class")) {
                    mainClass = map.get(obj).toString();
                    break;
                }
            }

            return mainClass;
        } catch (Exception ex) {
            ex.printStackTrace();
            JOptionPane.showMessageDialog(
                    null,
                    "Failed loading manifest: "
                            + ex.getClass().getSimpleName() + ": "
                            + ex.getMessage(), "jCrypt",
                    JOptionPane.ERROR_MESSAGE);
        }

        return null;
    }
}

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