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");}}}}