文件的读写与创建简单例子

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

public class FileOperator {

public static void main(String[] args) {

//createFile();

//createfold();

// write();

read();

}

//创建文件

public static void createFile(){

File file=new File("D:/b.txt");

try {

file.createNewFile();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

//新建文件夹

public static void createfold(){

File f=new File("D:/bb");

f.mkdir();

}

//写进文件

public static void write(){

File file=new File("D:/b.txt");

FileOutputStream fos=null;

try {

String str="abcdefg";

fos=new FileOutputStream(file);

try {

fos.write(str.getBytes());

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

//读取文件

public static void read(){

File f=new File("D:/b.txt");

FileInputStream fis=null;

try {

fis=new FileInputStream(f);

//字节数组存放

byte[] bs=new byte[1024];

try {

while(fis.read(bs)!=-1){

System.out.println(new String(bs));

}

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}