话不多说，直接上代码
public class SearchJava { public static void main(String[] args) { String path = "E:\\STS_workplace\\tms"; // 要遍历的路径 try { getFileList(path); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static List<File> getFileList(String strPath) throws FileNotFoundException { List<File> filelist = new ArrayList<File>(); File dir = new File(strPath); File[] files = dir.listFiles(); // 该文件目录下文件全部放入数组 if (files != null) { for (int i = 0; i < files.length; i++) { String fileName = files[i].getName(); if (files[i].isDirectory()) { // 判断是文件还是文件夹 getFileList(files[i].getAbsolutePath()); // 获取文件绝对路径 } else if (fileName.endsWith("java")) { // 判断文件名是否以.java结尾 String strFileName = files[i].getAbsolutePath(); System.out.println("---" + strFileName); String newfilePath = "E:\\STS_workplace\\myJava\\" + fileName; copyFile(strFileName, newfilePath); filelist.add(files[i]); } else { continue; } } } return filelist; } public static void copyFile(String oldPath, String newPath) { try { int bytesum = 0; int byteread = 0; File oldfile = new File(oldPath); if (oldfile.exists()) { // 文件存在时 InputStream inStream = new FileInputStream(oldPath); // 读入原文件 FileOutputStream fs = new FileOutputStream(newPath); byte[] buffer = new byte[1444]; int length; while ((byteread = inStream.read(buffer)) != -1) { bytesum += byteread; // 字节数 文件大小 System.out.println(bytesum); fs.write(buffer, 0, byteread); } inStream.close(); } } catch (Exception e) { System.out.println("复制单个文件操作出错"); e.printStackTrace(); } } }