1 import java.io.File;
 2 import java.io.FileInputStream;
 3 import java.io.FileOutputStream;
 4 import java.io.IOException;
 5 
 6 public class FileUtils {
 7 
 8     //复制文件
 9     public static void copyFile(File src, File dest) throws IOException{
10         if(!src.isFile()){
11             throw new RuntimeException(src.getPath() + "不存在");
12         }
13         FileInputStream fis = new FileInputStream(src);
14         FileOutputStream fos = new FileOutputStream(dest);
15         
16         byte[] data = new byte[1024];
17         int len;
18         while((len = fis.read(data))!=-1){
19             fos.write(data, 0, len);
20         }
21         
22         fos.close();
23         fis.close();
24     }
25 
26     //复制文件夹
27     public static void copyDirectory(File srcDir,File destDir)throws IOException{
28        //父目录不能拷贝到子目录中
29         if(destDir.getAbsolutePath().contains(srcDir.getAbsolutePath())){
30             throw new IOException("父目录不能拷贝到子目录中");
31         }
32         if(!destDir.isDirectory()){
33             throw new IOException("目标对象不是目录");
34         }
35         File dest = new File(destDir,srcDir.getName());
36         //如果srcDir是个文件，那么直接复制文件到destDir中
37         if(srcDir.isFile()){
38             copyFile(srcDir, dest);
39         }else{
40             dest.mkdirs();//先在destPath目录中创建srcDir对应的文件夹
41             File[] list = srcDir.listFiles();//准备复制srcDir的子目录或子文件
42             for(File f: list){
43                 copyDirectory(f,dest);
44             }
45         }
46     }
47 }

 1     //剪切文件夹
 2     public static void cutDirectory(File srcDir,File destDir)throws IOException{
 3         if(destDir.getAbsolutePath().contains(srcDir.getAbsolutePath())){
 4             throw new IOException("父目录不能剪切到子目录中");
 5         }
 6         if(!destDir.isDirectory()){
 7             throw new IOException("目标对象不是目录");
 8         }
 9         File dest = new File(destDir,srcDir.getName());
10         if(srcDir.isFile()){
11             copyFile(srcDir, dest);
12         }else{
13             dest.mkdirs();
14             File[] list = srcDir.listFiles();
15             for(File f: list){
16                 cutDirectory(f,dest);
17             }
18         }
19         srcDir.delete();
20     }