文件基本操作示例－文件读写

package jdk7;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class BufferInputStream {

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

//方法一

// File file = new File("d:\\jsgz\\jsgz.html");

// OutputStream out = new FileOutputStream(file);

//

// URL url=new URL("http://www.baidu.com");

// HttpURLConnection httpUrl=(HttpURLConnection) url.openConnection();

// InputStream in = httpUrl.getInputStream();

// byte [] b =new byte[1024];

// int len=-1;

// while((len=in.read(b))!=-1){

// out.write(b, 0, len);

// }

// in.close();

// out.close();

//方法二

File file = new File("d:\\jsgz\\jsgz.html");

OutputStream out = new FileOutputStream("d:\\jsgz\\jsgz_new.html");

InputStream in = new FileInputStream(file);

byte [] b = new byte[(int)file.length()];

in.read(b);

out.write(b);

}

}

先执行方法一，产生文件，在执行方法二。