重写系统标准输入输出流

public static void main(String[] args) throws IOException
{
//System.setIn(new FileInputStream("temp.txt"));//改变标准的输入
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

System.setOut(new PrintStream("big0725.txt"));//改变标准的输出
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

String line = null;
while((line = br.readLine())!=null)
{
if("over".equals(line))
break;
bw.write(line);
bw.newLine();
bw.flush();
}

br.close();
bw.close();
}