Implemented in Java copy a file or folder

copying a file algorithm is relatively simple, of course , can be optimized , such as the use buffer flow , improve the efficiency of read and write data . However, when copying a folder , you need to use Flie class is created in the target folder corresponding directory , and use recursive methods .

[java] view plaincopyprint? 
import java.io.*;   
/**  
 * ?????????  
 */   
public class CopyDirectory {   
    // ????    
    static String url1 = "f:/photos";   
    // ?????    
    static String url2 = "d:/tempPhotos";   
    public static void main(String args[]) throws IOException {   
        // ???????    
        (new File(url2)).mkdirs();   
        // ???????????????    
        File[] file = (new File(url1)).listFiles();   
        for (int i = 0; i < file.length; i++) {   
            if (file[i].isFile()) {   
                // ????    
                copyFile(file[i],new File(url2+file[i].getName()));   
            }   
            if (file[i].isDirectory()) {   
                // ????    
                String sourceDir=url1+File.separator+file[i].getName();   
                String targetDir=url2+File.separator+file[i].getName();   
                copyDirectiory(sourceDir, targetDir);   
            }   
        }   
    }   
// ????    
public static void copyFile(File sourceFile,File targetFile)    
throws IOException{   
        // ??????????????    
        FileInputStream input = new FileInputStream(sourceFile);   
        BufferedInputStream inBuff=new BufferedInputStream(input);   
   
        // ??????????????    
        FileOutputStream output = new FileOutputStream(targetFile);   
        BufferedOutputStream outBuff=new BufferedOutputStream(output);   
           
        // ????    
        byte[] b = new byte[1024 * 5];   
        int len;   
        while ((len =inBuff.read(b)) != -1) {   
            outBuff.write(b, 0, len);   
        }   
        // ?????????    
        outBuff.flush();   
           
        //???    
        inBuff.close();   
        outBuff.close();   
        output.close();   
        input.close();   
    }   
    // ?????    
    public static void copyDirectiory(String sourceDir, String targetDir)   
            throws IOException {   
        // ??????    
        (new File(targetDir)).mkdirs();   
        // ???????????????    
        File[] file = (new File(sourceDir)).listFiles();   
        for (int i = 0; i < file.length; i++) {   
            if (file[i].isFile()) {   
                // ???    
                File sourceFile=file[i];   
                // ????    
               File targetFile=new    
File(new File(targetDir).getAbsolutePath()   
+File.separator+file[i].getName());   
                copyFile(sourceFile,targetFile);   
            }   
            if (file[i].isDirectory()) {   
                // ?????????    
                String dir1=sourceDir + "/" + file[i].getName();   
                // ??????????    
                String dir2=targetDir + "/"+ file[i].getName();   
                copyDirectiory(dir1, dir2);   
            }   
        }   
    }   
}