加载指定包名下的所有类或根据类的annotation进行过滤的工具类

package org.konghao.sys.kit;

import java.io.File;
import java.io.FileFilter;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.io.FilenameUtils;
import org.konghao.sys.org.model.SysException;

public class BasicSysKit {
	/**
	 * 把(22)(33)(55)取出形成List
	 * @param str
	 * @return
	 */
	public static List braceStr2List(String str) {
		Pattern pattern = Pattern.compile("(\\d+)");
		Matcher m = pattern.matcher(str);
		List list = new ArrayList();
		while(m.find()) {
			list.add(Integer.parseInt(m.group()));
		}
		return list;
	}
	/**
	 * 判断对象是否为空
	 * @param obj
	 * @return
	 */
	@SuppressWarnings("rawtypes")
	public static boolean isEmpty(Object obj) {
		if(obj==null) return true;
		if(obj instanceof String) {
			if("".equals(obj)) return true;
		}
		if(obj instanceof Collection) {
			if(((Collection) obj).size()>0) return true;
		}
		return false;
	}
	
	/**
	 * 对两个list做合并
	 * @param baseList
	 * @param mergeList
	 */
	public static void mergeList(List baseList,List mergeList) {
		for(N o:mergeList) {
			if(!baseList.contains(o)) {
				baseList.add(o);
			}
		}
	}
	
	/**
	 * load包名下的所有class
	 * @param p
	 * @return
	 */
	@SuppressWarnings("rawtypes")
	public static List listByClass(String p) {
		try {
			List clzs = new ArrayList();
			String packagePath = p.replace(".", "/");
			URL url = Thread.currentThread().getContextClassLoader().getResource(packagePath);
			File file = new File(url.getPath());
			if(!file.exists()) throw new SysException("初始化的包名路径不正确");
			File []fs = file.listFiles(new FileFilter() {
				@Override
				public boolean accept(File pathname) {
					if(pathname.getName().endsWith(".class")) return true;
					return false;
				}
			});
			for(File f:fs) {
				String cname = p+"."+FilenameUtils.getBaseName(f.getName());
				Class clz = Class.forName(cname);
				clzs.add(clz);
			}
			return clzs;
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}
	
	/**
	 * load指定包名下的含有指定annotation类型的类
	 * @param p
	 * @param an
	 * @return
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static List listByClassAnnotation(String p,Class an) {
		try {
			List clzs = new ArrayList();
			String packagePath = p.replace(".", "/");
			URL url = Thread.currentThread().getContextClassLoader().getResource(packagePath);
			File file = new File(url.getPath());
			if(!file.exists()) throw new SysException("初始化的包名路径不正确");
			File []fs = file.listFiles(new FileFilter() {
				@Override
				public boolean accept(File pathname) {
					if(pathname.getName().endsWith(".class")) return true;
					return false;
				}
			});
			for(File f:fs) {
				String cname = p+"."+FilenameUtils.getBaseName(f.getName());
				Class clz = Class.forName(cname);
				if(clz.isAnnotationPresent(an))
					clzs.add(clz);
			}
			return clzs;
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}
	
}