java扫描包下的类，一般会配合注解使用

1、接口回调

package com.cmbc.epay.umm.utils;

import java.io.File;

public interface IWhat {
    void execute(File file,Class clazz);
}

2、扫描包的方法

public static void scanPackage(String iPackage,IWhat what){
        String path = iPackage.replace(".", "/");
        URL url = Thread.currentThread().getContextClassLoader().getResource(path);
        try {
            if(url!=null && url.toString().startsWith("file")){
                String filePath = URLDecoder.decode(url.getFile(),"utf-8");
                File dir = new File(filePath);
                List fileList = new ArrayList();
                fetchFileList(dir,fileList);
                for(File f:fileList){
                    String fileName =  f.getAbsolutePath();
                    if(fileName.endsWith(".class")){
                        String nosuffixFileName = fileName.substring(8+fileName.lastIndexOf("classes"),fileName.indexOf(".class"));
                        String filePackage = nosuffixFileName.replaceAll("\\\\", ".");
                        Class clazz = Class.forName(filePackage);
                        what.execute(f,clazz);
                    }else{
                        what.execute(f,null);
                    }
                    //TODO code........
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void  fetchFileList(File dir,List fileList){
        if(dir.isDirectory()){
            for(File f:dir.listFiles()){
                fetchFileList(f,fileList);
            }
        }else{
            fileList.add(dir);
        }
    }

3、测试

public static void main(String[] args) {
        scanPackage("com.cmbc",new IWhat() {

            @Override
            public void execute(File file, Class clazz) {
                System.out.println(file.getName());
            }
        });
    }