遍历文件下的所有文本文件,然后合并到一个文件

package cn.gp.test;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

public class File2FileDemo {

public static void main(String[] args) throws Exception{

OutputStream outputStream = new FileOutputStream(new File("d:\\2.txt"));

OutputStreamWriter writer = new OutputStreamWriter(outputStream);

BufferedReader bf = null;

BufferedWriter bw = new BufferedWriter(writer);

File dir = new File("D:\\1");

for(File f:dir.listFiles()){

System.out.println(f.getName());

if(f.isDirectory()){

//如果是文件那么进入更深层次的目录

bw.write("-------------------"+f.getName()+"-----------------------------\r\n");

for(File ff: f.listFiles()){

//得到文件名

String filename = ff.getName();

//将文件名单独一行打印,然后将文件逐行读出打印到输出流中

if(filename.endsWith("txt")){

InputStreamReader inputstream = new InputStreamReader(new FileInputStream(ff));

bf = new BufferedReader(inputstream);

String str = "";

bw.write("******************************"+filename+"******************************\r\n");

while((str=bf.readLine())!=null){

System.out.println((str=bf.readLine())+"........");

if(str != null){

bw.write(str+"\r\n");

}

}

}

}

}

}

bw.close();

bf.close();

}

}