Java文件拷贝

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import org.apache.commons.io.FileUtils;public class Demo1 {    public static void filecopy(String source,String target) throws Exception{        InputStream in = new FileInputStream(source);        OutputStream out=new FileOutputStream(target);        byte[] buffer = new byte[1024];        int read;        while( (read =in.read(buffer))!=-1 ){            out.write(buffer, 0, read);        }    }    public static void main(String[] args) throws Exception {        String aa = "F:\\11\\a\\1.txt";        String bb = "f:\\11\\b\\2.txt";        //filecopy(aa, bb);        File f1 = new File(aa);        File f2 = new File(bb);        FileUtils.copyFile(f1, f2);//apache commons-io    }}