巧夺天工，浑然天成————实现包扫描

相信大家学习Java到一定深度的时候，就会碰到一个问题————包扫描

• 接下来讲讲包扫描的自我实现
• 包扫描里面要注意的几个问题，一般的包里面的文件
• 以及jar包里面的文件
• 还有当包里面有目录的时候，我们需要进行递归调用
• 将目录里面的文件再进行解析

import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public abstract class PackageScanner {
	
	public abstract void dealClass(Class<?> klass);
	
	private void dealClassFile(String rootPackage, File file) {
		String fileName = file.getName();
		if (fileName.endsWith(".class")) {
			fileName = fileName.replace(".class", "");
			try {
				Class<?> klass = Class.forName(rootPackage + "." + fileName);
				dealClass(klass);
			} catch (ClassNotFoundException e) {
				e.printStackTrace();
			}
		}
	}
	
	private void dealDirectory(String rootPackage, File curFile) {
		File[] fileList = curFile.listFiles();
		for (File file : fileList) {
			if (file.isDirectory()) {
				dealDirectory(rootPackage + "." + file.getName(), file);
			} else if (file.isFile()) {
				dealClassFile(rootPackage, file);
			}
		}
	}
	
	private void dealJarPackage(URL url) {
		try {
			JarURLConnection connection = (JarURLConnection) url.openConnection();
			JarFile jarFile = connection.getJarFile();
			Enumeration<JarEntry> jarEntries = jarFile.entries();
			while (jarEntries.hasMoreElements()) {
				JarEntry jar = jarEntries.nextElement();
				if(jar.isDirectory() || !jar.getName().endsWith(".class")) {
					continue;
				}
				String jarName = jar.getName();
				jarName = jarName.replace(".class", "");
				jarName = jarName.replace("/", ".");
				
				try {
					Class<?> klass = Class.forName(jarName);
					dealClass(klass);
				} catch (ClassNotFoundException e) {
					e.printStackTrace();
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public void packageScanner(String packageName) {
		String rootPackage = packageName;
		packageName = packageName.replace(".", "/");
		URL url = Thread.currentThread().getContextClassLoader().getResource(packageName);
		try {
			if (url.getProtocol().equals("file")) {
				URI uri = url.toURI();
				File root = new File(uri);
				dealDirectory(rootPackage, root);
			} else {
				dealJarPackage(url);
			}
		} catch (URISyntaxException e) {
			e.printStackTrace();
		}
	}
	
}


*这个工具可读性还是不错的，各位可以读懂直接拿来用哦，
如果觉得还行的话，可以给个赞吗
哈哈哈哈哈*