Java实现文件或文件夹的复制到指定目录实例

import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream;  public class Test {   private static int a = 5;    public static void main(String[] args) {     //需要复制的目标文件或目标文件夹     String pathname = "C:/Users/likun/Desktop/git_project";     File file = new File(pathname);     //复制到的位置     String topathname = "C:/Users/likun/Desktop/movie";     File toFile = new File(topathname);     try {       copy(file, toFile);     } catch (Exception e) {       // TODO Auto-generated catch block       e.printStackTrace();     }   }    public static void copy(File file, File toFile) throws Exception {     byte[] b = new byte[1024];     int a;     FileInputStream fis;     FileOutputStream fos;     if (file.isDirectory()) {       String filepath = file.getAbsolutePath();       filepath=filepath.replaceAll("////", "/");       String toFilepath = toFile.getAbsolutePath();       toFilepath=toFilepath.replaceAll("////", "/");       int lastIndexOf = filepath.lastIndexOf("/");       toFilepath = toFilepath + filepath.substring(lastIndexOf ,filepath.length());       File copy=new File(toFilepath);       //复制文件夹       if (!copy.exists()) {         copy.mkdir();       }       //遍历文件夹       for (File f : file.listFiles()) {         copy(f, copy);       }     } else {       if (toFile.isDirectory()) {         String filepath = file.getAbsolutePath();         filepath=filepath.replaceAll("////", "/");         String toFilepath = toFile.getAbsolutePath();         toFilepath=toFilepath.replaceAll("////", "/");         int lastIndexOf = filepath.lastIndexOf("/");         toFilepath = toFilepath + filepath.substring(lastIndexOf ,filepath.length());                  //写文件         File newFile = new File(toFilepath);         fis = new FileInputStream(file);         fos = new FileOutputStream(newFile);         while ((a = fis.read(b)) != -1) {           fos.write(b, 0, a);         }       } else {         //写文件         fis = new FileInputStream(file);         fos = new FileOutputStream(toFile);         while ((a = fis.read(b)) != -1) {           fos.write(b, 0, a);         }       }      }   }  }