java遍历指定包下所有类
例子：
public static void main(String[] args)throws Exception {
String packageName ="com.example.demo3";
Set classNames =getClassName(packageName,true,".class");
if (classNames !=null) {
for (String className : classNames) {
System.out.println(className);
}
}
}
最后得到的结果是类似于：
com.example.demo3.mapper.Xiaoceshi51Entity.User.class
com.example.demo3.web.ceshi.CeshiController.class
com.example.demo3.mapper.mapperUserTestEntity.MenuSystemList.class
com.example.demo3.web.userManagement.VTORoleManagementIndex.class
com.example.demo3.dao.DataSourceMap.class
/**
* 获取某包下所有类
* @param packageName 包名
* @param isRecursion 是否遍历子包
* @param suffixstr 后綴名
* @return 类的完整名称
*/
public static Set getClassName(String packageName,boolean isRecursion , String suffixstr) {
Set classNames =null;
ClassLoader loader = Thread.currentThread().getContextClassLoader();
String packagePath = packageName.replace(".","/");
URL url = loader.getResource(packagePath);
if (url !=null) {
String protocol = url.getProtocol();
if (protocol.equals("file")) {
classNames =getClassNameFromDir(url.getPath(), packageName, isRecursion, suffixstr);
}else if (protocol.equals("jar")) {
JarFile jarFile =null;
try{
jarFile = ((JarURLConnection) url.openConnection()).getJarFile();
}catch(Exception e){
e.printStackTrace();
}
if(jarFile !=null){
getClassNameFromJar(jarFile.entries(), packageName, isRecursion);
}
}
}else {
/*从所有的jar包中查找包名*/
classNames =getClassNameFromJars(((URLClassLoader)loader).getURLs(), packageName, isRecursion);
}
return classNames;
}
/**
* 从项目文件获取某包下所有类
* @param filePath 文件路径
* @param packageName 类名集合
* @param isRecursion 是否遍历子包
* @param suffixstr 後綴名
* @return 类的完整名称
*/
private static Set getClassNameFromDir(String filePath, String packageName,boolean isRecursion, String suffixstr) {
Set className =new HashSet();
try {
filePath = java.net.URLDecoder.decode(new String(filePath.getBytes("ISO-8859-1"),"UTF-8"),"UTF-8");
File file =new File(filePath);
File[] files = file.listFiles();
for (File childFile : files) {
if (childFile.isDirectory()) {
if (isRecursion) {
className.addAll(getClassNameFromDir(childFile.getPath(), packageName+"."+childFile.getName(), isRecursion, suffixstr));
}
}else {
String fileName = childFile.getName();
if (fileName.endsWith(suffixstr) && !fileName.contains("$")) {
//className.add(fileName);
className.add(packageName+"." + fileName);
}
}
}
}catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return className;
}
/**
* @param jarEntries
* @param packageName
* @param isRecursion
* @return
*/
private static Set getClassNameFromJar(Enumeration jarEntries, String packageName,boolean isRecursion){
Set classNames =new HashSet();
while (jarEntries.hasMoreElements()) {
JarEntry jarEntry = jarEntries.nextElement();
if(!jarEntry.isDirectory()){
/*
* 这里是为了方便，先把"/" 转成 "." 再判断 ".class" 的做法可能会有bug
* (FIXME: 先把"/" 转成 "." 再判断 ".class" 的做法可能会有bug)*/
String entryName = jarEntry.getName().replace("/",".");
if (entryName.endsWith(".class") && !entryName.contains("$") && entryName.startsWith(packageName)) {
entryName = entryName.replace(".class","");
if(isRecursion){
classNames.add(entryName);
}else if(!entryName.replace(packageName+".","").contains(".")){
classNames.add(entryName);
}
}
}
}
return classNames;
}
/**
* 从所有jar中搜索该包，并获取该包下所有类
* @param urls URL集合
* @param packageName 包路径
* @param isRecursion 是否遍历子包
* @return 类的完整名称
*/
private static Set getClassNameFromJars(URL[] urls, String packageName,boolean isRecursion) {
Set classNames =new HashSet();
for (int i =0; i < urls.length; i++) {
String classPath = urls[i].getPath();
//不必搜索classes文件夹
if (classPath.endsWith("classes/")) {continue;}
JarFile jarFile =null;
try {
jarFile =new JarFile(classPath.substring(classPath.indexOf("/")));
}catch (IOException e) {
e.printStackTrace();
}
if (jarFile !=null) {
classNames.addAll(getClassNameFromJar(jarFile.entries(), packageName, isRecursion));
}
}
return classNames;
}
