编写Java程序将键盘输入的内容写入到文本文件txt中。要求：结合BufferedWriter缓冲流实现。

import java.io.*;

public class WriteToFile { public static void main(String[] args) { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); BufferedWriter bw = null; try { File file = new File("output.txt"); bw = new BufferedWriter(new FileWriter(file)); System.out.println("请输入要写入文件的内容（输入exit结束）："); String line = ""; while (!line.equals("exit")) { line = br.readLine(); bw.write(line); bw.newLine(); } System.out.println("内容已写入文件output.txt"); } catch (IOException e) { e.printStackTrace(); } finally { try { if (bw != null) { bw.close(); } if (br != null) { br.close(); } } catch (IOException e) { e.printStackTrace(); } } }