java文件的遍历(流，文件的拷贝)

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package com.softeem.day_18;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class File_1 {    public void wenjian(String path1) {        File fl = new File(path1);        File[] f = fl.listFiles();        if (f != null) {            for (File f1 : f) {    //遍历文件                StringBuffer sbb = new StringBuffer(f1.getParent());                if(f1.isFile()) {                    String str= f1.getName();                    System.out.println(f1.getName());                    File fi = new File("F:/laji/" + sbb.delete(0, 2)+ f1.getName());                    try {                        FileInputStream fis = new FileInputStream(f1);                        int i;                        byte[] bu = new byte[1024000];                        while ((i = fis.read(bu)) != -1) {        //边读边写入流                            FileOutputStream fos = new FileOutputStream(fi,                                    true);                            fos.write(bu);                            fos.close();                        }                    } catch (FileNotFoundException e1) {                        // TODO Auto-generated catch block                        e1.printStackTrace();                    } catch (IOException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                    if (f1.exists()) {                        try {                            fi.createNewFile();                        } catch (IOException e) {                            // TODO Auto-generated catch block                            e.printStackTrace();                        }                    }                } else {                   //如果是文件夹，获取其路径，再调用方法，直到文件夹里没有文件                    File fi = new File("F:/laji/" + sbb.delete(0, 2));                    fi.mkdir();                    String p = f1.getAbsolutePath();                    System.out.println(p);                    wenjian(p);                }            }        }    }        public static void main(String[] args) {        File_1 file = new File_1();        file.wenjian("C:/");    }}