扫描包的工具类代码,Java代码库,德仔网

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【Java】扫描包的工具类
作者:free_bird / 发布于2013/7/1/ 814

	/*比如 com 可以扫描 com包下的所有类
	工具类分为两个Class
	1 ClassUtils
	 里面只有两个共有方法为
	 scanPackage(String packageName,ClassFilter filter)
	 scanPackage(String packageName)
	2 ClassFilter
	 一个获得class的策略,是一个接口类，里面有一个accept(Class clazz)方法,通过实现ClssFilter获得相应特征的Class*/

	package com.abs.agile.study.util;
	public interface ClassFilter {
	 boolean accept(Class clazz);
	}

	

	package com.abs.agile.study.util;

	import java.io.File;
	import java.io.FileFilter;
	import java.util.ArrayList;
	import java.util.List;

	public class ClassUtils {
	private static final String CLASS_PATH = ClassUtils.class.getClassLoader().getResource("").getPath();
	private static final String EXT = ".class";
	private static final String BLANK_STR = "";
	private static final String DOT = ".";
	private static final ClassFilter DEFAULT_CLASS_FILTER = new ClassFilter(){
	 @Override
	 public boolean accept(Class clazz) {
	 return Boolean.TRUE;
	 }
	};
	private static FileFilter classFileFilter = new FileFilter() {
	 @Override
	 public boolean accept(File pathname) {
	 return pathname.getName().endsWith(EXT)|| pathname.isDirectory();
	 }
	};
	public static List<Class> scanPackage(String packageName,ClassFilter classFilter) {
	 final File classFileDirectory = getScanClassFileDirectory(obtainFilePath(packageName));
	 final List<Class> classList = new ArrayList<Class>();
	 scanFiles(classFileDirectory, classList,classFilter == null ? DEFAULT_CLASS_FILTER : classFilter);
	 return classList;
	}
	public static List<Class> scanPackage(String packageName) {
	 return scanPackage(packageName,DEFAULT_CLASS_FILTER);
	}
	private static void scanFiles(File file, List<Class> classList,ClassFilter classFilter) {
	 if (file.isDirectory()) {
	 for (File f : file.listFiles(classFileFilter)) {
	 scanFiles(f, classList,classFilter);
	 }
	 } else {
	 try{
	 final Class clazz = getClass(file,classFilter);
	 if(clazz != null){
	 classList.add(clazz);
	 }
	 }catch(ClassNotFoundException ex){}
	 }
	}
	private static Class getClass(File file,ClassFilter classFilter) throws ClassNotFoundException {
	 final String packagePath = file.getAbsolutePath().substring(file.getAbsolutePath().indexOf(CLASS_PATH)+ CLASS_PATH.length());
	 Class clazz = Class.forName(getClassFullName(packagePath));
	 if(classFilter.accept(clazz)){
	 return clazz;
	 }
	 return null;
	 }
	private static String getClassFullName(String packagePath) {
	 return packagePath.replace(File.separator, DOT).replace(EXT, BLANK_STR);
	}
	private static File getScanClassFileDirectory(String filePath) {
	 return new File(filePath);
	}
	private static String obtainFilePath(String packageName) {
	 final String oppositeFilePath = packageName.replace(DOT, File.separator);
	 return CLASS_PATH + oppositeFilePath;
	}
	}

	

	

	package com.abs.agile.study.util;

	public class A2 implements A {

	}

	

	

	package com.abs.agile.study.util;

	public class A1 implements A {

	}

	

	package com.abs.agile.study.util;

	public interface A {

	}
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