如何使用包扫描工具获取Java项目中所有路径？

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javapackage com.amiu.util;

import java.io.File;import java.io.IOException;import java.io.InputStream;import java.net.URL;import java.util.Properties;

public class PathUtil { /** * 获取项目根路径 */ public static String getProjectRoot() { URL url=PathUtil.class.getClassLoader().getResource(); if (url !=null) { return url.getPath(); } return null; }}

package com.amiu.util; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.util.Properties; public class PathUtil { /** * 获取项目根路径 */ public static String getProjectPath() throws IOException { File directory = new File(""); String projectPath = directory.getCanonicalPath(); return projectPath; } /** * 获取包绝对(编译)路径,packageName为空或空字符串则获取项目(编译)绝对路径 */ public static String getPackagePath(String packageName) { ClassLoader loader = Thread.currentThread().getContextClassLoader(); String filePath = ""; if (packageName != null && packageName.length() > 0) filePath = packageName.replace(".", "/"); URL url = loader.getResource(filePath); return url.getPath(); } /** * 获取类的绝对(编译)路径 */ public static String getClassPath(Class clazz) { String path = "/"+getPackageName(clazz).replace('.', '/'); return clazz.getResource(path).getFile().toString();// .getFile().toString(); } /** * 获取当前类所在的包 */ public static String getPackageName(Class clazz) { return clazz.getPackage().getName(); } // 读取“classpath：”文件，获取输入流 public static InputStream getClasspathInputStream(String fileName) throws IOException { if (fileName.startsWith("classpath:")) fileName = fileName.replaceFirst("classpath:", "").trim(); InputStream is = PathUtil.class.getClassLoader().getResourceAsStream(fileName); return is; } public static void main(String[] args) throws IOException { //获取项目根路径 System.out.println(PathUtil.getProjectPath()); //获取项目WEB-INF路径 System.out.println(PathUtil.getProjectPath()+"src\\main\\webapp\\WEB-INF"); //获取com包路径（编译路径，我们的.class存放的路径） System.out.println(PathUtil.getPackagePath("com")); //获取类PathUtil的编译路径 System.out.println(PathUtil.getClassPath(PathUtil.class)); //获取PathUtil所在包 System.out.println(PathUtil.getPackageName(PathUtil.class)); } } 2、包扫描

package com.amiu.util; import java.io.File; import java.io.IOException; 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; import org.junit.Assert; public class PackageUtil { /** * 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 IOException */ public static List getClassName(String packageName) throws IOException { return getClassName(packageName, true); } /** * 以当前运行class下的路径作为基准，获取某包下所有类,可以扫描jar包 * maven src/test/java 文件夹拥有自己的路径 ：target\test-classes * src/main/java 的路径却是 target\classes * 当我们在src/test/java中运行此方法，获取不到src/main/java中的类 * 这时会导致获取错误路径，获取不到想要的路径,当这个方法出错，推荐使用 * {@link PackageUtil#getClassName(String, boolean)} * * @param packageName * 包名 * @param childPackage * 是否遍历子包 * @return 类的完整名称 */ public static List getCurrentRunClassPathPackageName(String packageName, boolean childPackage) { List fileNames = null; //以当前运行class的ClassLoader ClassLoader loader = Thread.currentThread().getContextClassLoader(); String packagePath = packageName.replace(".", "/"); URL url = loader.getResource(packagePath); if (url != null) { String type = url.getProtocol(); if (type.equals("file")) { fileNames = getClassNameByFile(url.getPath(), null, childPackage); } else if (type.equals("jar")) { fileNames = getClassNameByJar(url.getPath(), childPackage); } } else { fileNames = getClassNameByJars(((URLClassLoader) loader).getURLs(), packagePath, childPackage); } return fileNames; } /** * 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 IOException */ public static List getClassName(String packageName, boolean childPackage) throws IOException { List fileNames = null; ClassLoader loader = Thread.currentThread().getContextClassLoader(); String packagePath = packageName.replace(".", "/"); //获取所有资源，这里能获取到maven的/target/test-classes 和 /target/classes/ Enumeration dirs = loader.getResources(packagePath); while (dirs.hasMoreElements()) { URL url = dirs.nextElement(); if (url != null) { String type = url.getProtocol(); if (type.equals("file")) { fileNames = getClassNameByFile(url.getPath(), null, childPackage); } else if (type.equals("jar")) { 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 getClassNameByFile(String filePath, List className, boolean childPackage) { List myClassName = new ArrayList (); 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 */ private static List getClassNameByJar(String jarPath, boolean childPackage) { List myClassName = new ArrayList (); String[] jarInfo = jarPath.split("!"); String jarFilePath = jarInfo[0].substring(jarInfo[0].indexOf("/")); String packagePath = jarInfo[1].substring(1); try { JarFile jarFile = new JarFile(jarFilePath); Enumeration 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) { e.printStackTrace(); } 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 */ private static List getClassNameByJars(URL[] urls, String packagePath, boolean childPackage) { List myClassName = new ArrayList (); 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; } }