java 文件输入输出流 文件的复制

package com.enation.test.shop.cart;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

public class Test {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

copyFile("D:/o2o/linux服务器数据实时同步技术.docx","D:/spring/linux服务器数据实时同步技术.docx");

}

public static void copyFile(String oldPath, String newPath) {

try {

int bytesum = 0;

int byteread = 0;

File oldfile = new File(oldPath);

if (oldfile.exists()) { //文件存在时

InputStream inStream = new FileInputStream(oldPath); //读入原文件

FileOutputStream fs = new FileOutputStream(newPath);

byte[] buffer = new byte[1444];

int length;

while ( (byteread = inStream.read(buffer)) != -1) {

bytesum += byteread; //字节数 文件大小

System.out.println(bytesum);

fs.write(buffer, 0, byteread);

}

inStream.close();

}

} catch (Exception e) {

System.out.println("复制单个文件操作出错");

e.printStackTrace();

}

}

}