java io源

java io流

1.字节流
public  static void main(String args[])  throws IOException
    {             
        FileInputStream  fis=new FileInputStream("C:\\1.jpg") ;
        FileOutputStream fos=new FileOutputStream("F:\\2.jpg");
                       
           byte[]  arr =new  byte[1024];                   
                      int len=0;
             while((len=fis.read(arr))!=-1)    
                    {
                               fos.write(arr);
                     }
                        
                fos.close()                                              
                   fis.close();
                    
       }



2.缓存字节流
   public static void method_1()throws IOException
{
FileInputStream fis = new FileInputStream("C:\\1.jpg");
BufferedInputStream bufis = new BufferedInputStream(fis);FileOutputStream fos = new FileOutputStream("F:\\2.jpg");
BufferedOutputStream bufos = new BufferedOutputStream(fos);
int temp = 0;
while((temp=bufis.read())!=-1)   
{
bufos.write(temp);
}
bufos.close();
bufis.close();
}


3.缓冲区字符流
class CopyTextByBuf
{
public static void main(String[] args)
{
FileReader fr = null;
FileWriter fw = null;
BufferedReader bufr = null;
BufferedWriter bufw = null;

try
{
fr = new FileReader("bufw.txt");
bufr = new BufferedReader(fr);

fw = new FileWriter("bufw1.txt");
bufw = new BufferedWriter(fw);
                 String line = null;
                 while((line=bufr.readLine())!=null)  
bufw.write(line);           bufw.newLine();         
  //写入一个行分隔符（代替了\r\n或者\n,使其不在受平台的限制）。
bufw.flush();
}
}
catch (IOException e)
{
System.out.println(e.toString());
}
finally
{
try
{
if(bufw!=null)
bufw.close();
}
catch (IOException e)
{
throw new RuntimeException("挂了");
}
try
{
if(bufr!=null)
bufr.close();
}
       catch (IOException e)
{
throw new RuntimeException("挂了");
}
}

}
}