IO流——通过缓冲区复制文本文件

/*
通过缓冲区复制一个.java文件。

*/
import java.io.*;

class  CopyTextByBuf
{
public static void main(String[] args) 
{
BufferedReader bufr = null;
BufferedWriter bufw = null;

try
{
bufr = new BufferedReader(new FileReader("BufferedWriterDemo.java"));
bufw = new BufferedWriter(new FileWriter("bufWriter_Copy.txt"));

String line = null;

while((line=bufr.readLine())!=null)
{
bufw.write(line);
bufw.newLine();
bufw.flush();

}
}
catch (IOException e)
{
throw new RuntimeException("读写失败");
}
finally
{
try
{
if(bufr!=null)
bufr.close();
}
catch (IOException e)
{
throw new RuntimeException("读取关闭失败");
}
try
{
if(bufw!=null)
bufw.close();
}
catch (IOException e)
{
throw new RuntimeException("写入关闭失败");
}
}
}
}