Java实现文件或文件夹的复制到指定目录

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);
}
}

}
}

}