三更半夜隨便來點代碼提提神~ 懶人寫Factory

package org.jc.buss.pur.route;

import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.jc.common.utils.Keys;
import org.jc.utils.InstanceUtil;

public class PurRouteFactory {

    private static final String PACKAGENAME = "org.jc.buss.pur.route.impl";

    private static Map<String, PurRouteSrv> cache = new ConcurrentHashMap<>();

    static {
        List<PurRouteSrv> classList = null;
        try {
            // 獲取PACKAGENAME目錄下PurRouteSrv類型實例
            classList = InstanceUtil.getInstance(PurRouteSrv.class, PACKAGENAME);
        } catch (Exception e) {
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("PurRouteFactory 啓動失敗！！！！");
            System.exit(0);
        }
        for (PurRouteSrv srv : classList) {
            srv.init();
            cache.put(srv.getAirCode(), srv);
            System.out.println(srv.getClass() + " init ok.");
        }
    }

    public static PurRouteSrv get(String airCode) {
        PurRouteSrv srv = cache.get(airCode);
        return srv;
    }

    public static Set<String> airs() {
        return cache.keySet();
    }
}

package org.jc.buss.pur;

import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.jc.utils.InstanceUtil;

public class PurServiceFactory {

    private static final String PACKAGENAME = "org.jc.buss.pur";

    private static Map<String, Class<?>> cache = new ConcurrentHashMap<>();

    static {
        try {
            // 獲取PACKAGENAME目錄下PurService類型Class
            List<Class<?>> classList = InstanceUtil.getClass(PurService.class, PACKAGENAME);
            for (Class<?> clazz : classList) {
                PurService purService = (PurService) clazz.newInstance();
                cache.put(purService.getAirCode(), clazz);
                System.out.println(purService.getClass() + " init ok.");
            }
        } catch (Exception e) {
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
            System.err.println("PurRouteFactory 啓動失敗！！！！");
            System.exit(0);
        }
    }

    public static IPurService get(String airCode) {
        Class<?> clazz = cache.get(airCode);
        Object obj = null;
        try {
            obj = clazz.newInstance();
        } catch (InstantiationException e) {
        } catch (IllegalAccessException e) {
        }
        return (IPurService) obj;
    }
}

package org.jc.utils;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import org.jc.buss.pur.PurService;

public class InstanceUtil {

    public static <T> List<Class<?>> getClass(Class<T> clazz, String packageName)
            throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException {
        List<Class<?>> result = new ArrayList<Class<?>>();

        String _packageName = packageName;
        String packageDirName = _packageName.replace('.', '/');

        Enumeration<URL> dirs = Thread.currentThread().getContextClassLoader().getResources(packageDirName);
        while (dirs.hasMoreElements()) {
            URL url = dirs.nextElement();
            List<File> fileList = getFiles(url.getPath(), true);
            if (null != fileList && !fileList.isEmpty()) {
                for (File file : fileList) {
                    String className = file.getAbsolutePath().substring(file.getAbsolutePath().indexOf("classes") + 8)
                            .replaceAll(".class", "").replaceAll("\\\\", ".").replaceAll("/", ".");
                    try {
                        Class<?> instance = Class.forName(className, false,
                                Thread.currentThread().getContextClassLoader());
                        if (!clazz.isAssignableFrom(instance) || clazz == instance) {
                            continue;
                        }
                        result.add(instance);
                    } catch (Exception e) {
                        System.out.println(e.getMessage());
                    }
                }
            }
        }
        return result;
    }

    @SuppressWarnings("unchecked")
    public static <T> List<T> getInstance(Class<T> clazz, String packageName)
            throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException {
        List<T> result = new ArrayList<T>();

        List<Class<?>> classList = getClass(clazz, packageName);
        if (null != classList && !classList.isEmpty()) {
            for (Class<?> c : classList) {
                result.add((T) c.newInstance());
            }
        }

        return result;
    } 

    public static List<File> getFiles(String path, boolean isAddDirectory) {
        List<File> list = new ArrayList<>();
        getFiles(list, path, isAddDirectory);
        return list;
    }

    public static List<File> getFiles(List<File> list, String path, boolean isAddDirectory) {
        File baseFile = new File(path);
        if (baseFile.isFile() || !baseFile.exists()) {
            return list;
        }
        File[] files = baseFile.listFiles();
        for (File file : files) {
            if (file.isDirectory()) {
                if (isAddDirectory) {
                    getFiles(list, file.getAbsolutePath(), isAddDirectory);
                }
            } else {
                list.add(file);
            }
        }
        return list;
    }
}