获取包下的类名
import java.io.File; import java.net.URL; import java.net.URLClassLoader; import java.util.ArrayList; import java.util.Enumeration; import java.util.List; import java.util.jar.JarEntry; import java.util.jar.JarFile; /** * @ClassName PackageUtil * @Description (获取包下的类名) * @author wwj * @Date 2017年5月3日 下午4:50:09 * @version 1.0.0.0 */ public class PackageUtil { public static void main(String[] args) throws Exception { String packageName = "com.pf.task.slave.todo.download.bjwt.dao"; List<String> classNames = getClassName(packageName, false); if (classNames != null) { for (String className : classNames) { System.out.println(className); } } } /** * 获取某包下(包括该包的所有子包)所有类 * @param packageName 包名 * @return 类的完整名称 * @throws Exception */ public static List<String> getClassName(String packageName) throws Exception { return getClassName(packageName, true); } /** * 获取某包下所有类 * @param packageName 包名 * @param childPackage 是否遍历子包 * @return 类的完整名称 * @throws Exception */ public static List<String> getClassName(String packageName, boolean childPackage) throws Exception { List<String> fileNames = null; ClassLoader loader = Thread.currentThread().getContextClassLoader(); String packagePath = packageName.replace(".", "/"); URL url = loader.getResource(packagePath); if (url != null) { String type = url.getProtocol(); if ("file".equals(type)) { fileNames = getClassNameByFile(url.getPath(), null, childPackage); } else if (("jar").equals(type)) { fileNames = getClassNameByJar(url.getPath(), childPackage); } } else { fileNames = getClassNameByJars(((URLClassLoader) loader).getURLs(), packagePath, childPackage); } return fileNames; } /** * 从项目文件获取某包下所有类 * @param filePath 文件路径 * @param className 类名集合 * @param childPackage 是否遍历子包 * @return 类的完整名称 */ private static List<String> getClassNameByFile(String filePath, List<String> className, boolean childPackage) { List<String> myClassName = new ArrayList<String>(); File file = new File(filePath); File[] childFiles = file.listFiles(); for (File childFile : childFiles) { if (childFile.isDirectory()) { if (childPackage) { myClassName.addAll(getClassNameByFile(childFile.getPath(), myClassName, childPackage)); } } else { String childFilePath = childFile.getPath(); if (childFilePath.endsWith(".class")) { childFilePath = childFilePath.substring(childFilePath.indexOf("\\classes") + 9, childFilePath.lastIndexOf(".")); childFilePath = childFilePath.replace("\\", "."); myClassName.add(childFilePath); } } } return myClassName; } /** * 从jar获取某包下所有类 * @param jarPath jar文件路径 * @param childPackage 是否遍历子包 * @return 类的完整名称 * @throws Exception */ private static List<String> getClassNameByJar(String jarPath, boolean childPackage) throws Exception { List<String> myClassName = new ArrayList<String>(); String[] jarInfo = jarPath.split("!"); String jarFilePath = jarInfo[0].substring(jarInfo[0].indexOf("/")); String packagePath = jarInfo[1].substring(1); JarFile jarFile = null; try { jarFile = new JarFile(jarFilePath); Enumeration<JarEntry> entrys = jarFile.entries(); while (entrys.hasMoreElements()) { JarEntry jarEntry = entrys.nextElement(); String entryName = jarEntry.getName(); if (entryName.endsWith(".class")) { if (childPackage) { if (entryName.startsWith(packagePath)) { entryName = entryName.replace("/", ".").substring(0, entryName.lastIndexOf(".")); myClassName.add(entryName); } } else { int index = entryName.lastIndexOf("/"); String myPackagePath; if (index != -1) { myPackagePath = entryName.substring(0, index); } else { myPackagePath = entryName; } if (myPackagePath.equals(packagePath)) { entryName = entryName.replace("/", ".").substring(0, entryName.lastIndexOf(".")); myClassName.add(entryName); } } } } } catch (Exception e) { throw e; }finally{ if(null != jarFile){ jarFile.close(); } } return myClassName; } /** * 从所有jar中搜索该包,并获取该包下所有类 * @param urls URL集合 * @param packagePath 包路径 * @param childPackage 是否遍历子包 * @return 类的完整名称 * @throws Exception */ private static List<String> getClassNameByJars(URL[] urls, String packagePath, boolean childPackage) throws Exception { List<String> myClassName = new ArrayList<String>(); if (urls != null) { for (int i = 0; i < urls.length; i++) { URL url = urls[i]; String urlPath = url.getPath(); // 不必搜索classes文件夹 if (urlPath.endsWith("classes/")) { continue; } String jarPath = urlPath + "!/" + packagePath; myClassName.addAll(getClassNameByJar(jarPath, childPackage)); } } return myClassName; } }