//復制文件
public static void copy(File f1, String path) throws IOException {
?? ??? ?System.out.println("***copy***" + f1.getName());
?? ??? ?FileInputStream in = new FileInputStream(f1);
?? ??? ?FileOutputStream out = new FileOutputStream(path + f1.getName());
?? ??? ?byte[] bytes = new byte[512];
?? ??? ?while ((in.read(bytes)) != -1) {
?? ??? ??? ?out.write(bytes, 0, bytes.length);
?? ??? ?}
?? ??? ?out.close();
?? ??? ?in.close();
?? ?}

public static void copyAll(File A, File B) throws IOException {
?? ??? ?boolean flag = true;
?? ??? ?if (!B.exists()) {
?? ??? ??? ?B.mkdir();
?? ??? ?}
?? ??? ?String[] a=A.list();
?? ??? ?//遍歷A中所有文件及文件夾
?? ??? ?for (int i = 0; i < a.length; i++) {
?? ??? ??? ?System.out.println("a:"+a[i]);
?? ??? ??? ?//若A中含有文件夾
?? ??? ??? ?if (new File(A.getPath()+"/"+a[i]).isDirectory()) {
?? ??? ??? ??? ?File newFolder=null;
?? ??? ??? ??? ?if (! ( new File(B.getPath()+"/"+a[i]).exists() )) {
?? ??? ??? ??? ??? ?newFolder = new File(B, a[i]);
?? ??? ??? ??? ??? ?newFolder.mkdir(); //創(chuàng)建子文件夾
?? ??? ??? ??? ?}
?? ??? ??? ??? ?//遞歸，判斷
?? ??? ??? ??? ?copyAll(new File(A.getPath()+"/"+a[i]), newFolder);
?? ??? ??? ?}
?? ??? ??? ?//若A中含有文件，直接復制文件
?? ??? ??? ?else {
?? ??? ??? ??? ?copyOtherFile(new File(A.getPath()+"/"+a[i]), B);
?? ??? ??? ?}?? ??? ??? ?
?? ??? ?}
?? ??? ?
?? ?}

public static void copyOtherFile(File srcfile, File destfile) throws IOException {
?? ??? ?File[] destlist = destfile.listFiles();
?? ??? ?boolean flag = true;
?? ??? ??? ?flag = true;
?? ??? ??? ?for (File f2 : destlist) {
?? ??? ??? ??? ?System.out.println("f:" + srcfile.getName());
?? ??? ??? ??? ?System.out.println("f2:" + f2.getName());
?? ??? ??? ??? ?//含有同名文件，不進行復制
?? ??? ??? ??? ?if (srcfile.getName().equals(f2.getName())) {
?? ??? ??? ??? ??? ?System.out.println("相同");
?? ??? ??? ??? ??? ?flag = false;
?? ??? ??? ??? ??? ?break;
?? ??? ??? ??? ?} else {
?? ??? ??? ??? ??? ?System.out.println("不相同");
?? ??? ??? ??? ?}
?? ??? ??? ?}
?? ??? ??? ?if (flag) {
?? ??? ??? ??? ?copy(srcfile, destfile.getPath() + "/");
?? ??? ??? ?}
?? ??? ?
?? ?}

public static void main(String[] args) throws IOException {
?? ??? ?File file = new File("F:/a");
?? ??? ?File file2 = new File("F:/b");
?? ??? ?copyAll(file, file2);
?? ??? ?System.out.println("復制成功?。。?);
?? ?}