通过Java IO递归实现操作系统对文件的复制、粘贴和删除功能，剪切=复制+粘贴+删除
代码示例：
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException; /**
* achieve file copy and delete using recursion
*
* @author ForeverLover
*
*/
public class FileCopyAndDelete { // delete files of this path
public void deleteFile(String path) {
File f = new File(path);
if (f.isDirectory()) {
File[] file = f.listFiles();
for (File file1 : file) {
this.deleteFile(file1.toString());
file1.delete();
}
} else {
f.delete();
}
f.delete();
} // copy files from path1 to path2
public void copyFiles(String path1, String path2) throws IOException {
File f = new File(path1);
if (f.isDirectory()) {
File file = new File(path2);
if (!file.exists())
file.mkdir();
File[] file1 = f.listFiles();
for (File file2 : file1) {
copyFiles(file2.toString(), path2 + "/" + file2.getName());
}
} else {
copy(path1, path2);
}
} // copy file from path1 to path2 one by one
public void copy(String path1, String path2) throws IOException { DataInputStream in = new DataInputStream(new BufferedInputStream(
new FileInputStream(path1))); byte[] b = new byte[in.available()];// available返回实际可读字节数，即总大小
in.read(b); DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
new FileOutputStream(path2)));
out.write(b); in.close();
out.close();
} //main method
public static void main(String[] args) {
FileCopyAndDelete f = new FileCopyAndDelete(); // test copy files using recursive
/*
* { String path1 = "D://Folder1"; String path2 = "D://Folder2"; try {
* f.copyFiles(path1, path2); System.out.println("OK,COPY FINISH"); }
* catch (IOException e) { e.printStackTrace(); } }
*/ // test delete files using recursive
/*
* { f.deleteFile("C://Folder1");
* System.out.println("OK,DELETE FINISH"); }
*/ }
}