java学习初探十七之IO流_FileOutputStream

1.

import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class StreamTest06 {    public static void main(String[] args) {        FileOutputStream fileOutputStream=null;        try {            //1.创建文件字节输出流            // fileOutputStream=new FileOutputStream("temp09.txt");             //以追加的方式写入            fileOutputStream=new FileOutputStream("temp09.txt",true);            //2.开始写             String msString="HelloWorld";             //将String转换成byte数组             byte[] bytes=msString.getBytes();             //将byte数组中所以数据写入             //fileOutputStream.write(bytes);             //将byte数组中一部分写入             fileOutputStream.write(bytes, 0, 4);            //推荐最后的时候为了保证数据完全写入硬盘，所以要刷新             fileOutputStream.flush();//强制刷新        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally {            if(fileOutputStream!=null) {                try {                    fileOutputStream.close();                } catch (Exception e2) {                    e2.printStackTrace();                }            }        }    }}

2.copy文件

import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;/** * 关于文件的赋值粘贴 * @author LK * */public class StreamTest07 {    public static void main(String[] args) throws Exception {    //创建输入流    FileInputStream fileInputStream=new FileInputStream("temp09.txt");    //创建输出流    FileOutputStream fileOutputStream=new FileOutputStream("temp10.txt");    //一边读，一边写    byte[] bytes=new byte[1024];     int temp=0;     while ((temp=fileInputStream.read(bytes))!=-1) {        //将byte数组中内容直接写入         fileOutputStream.write(bytes,0,temp);    }    //刷新    fileOutputStream.flush();    //关闭    fileInputStream.close();    fileOutputStream.close();    }}