写入ByteArrayOutputStream时缺少NewLines

Question

我正在尝试读取txt文件并使用套接字从它传递数据，但看起来我在写入outputstream时缺少换行符。

我的txt文件是：

private byte[] readFile(String path) throws IOException {

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DataOutputStream out = new DataOutputStream(baos);

    File file = new File(path);
    Scanner scanner = new Scanner(file);

    while (scanner.hasNextLine()){
        out.writeUTF(scanner.nextLine());
    }

    byte[] bytes = baos.toByteArray();
    return bytes;
}

ByteArrayOutputStream：

  

{“firstName”：“John”，“lastName”：“Smith”，“isAlive”：   true，“age”：25，“address”：{％“streetAddress”：“21 2nd   街道“，”城市“：”纽约“，”州“：”纽约“，
  “postalCode”：“10021-3100”}}

SCANER：

System.getProperty("line.separator"); 

修改

baos

帮助我使用新行，但我仍然在System.out.println(new String(baos.toByteArray()));

中收到一些无效字符

 input.csv
    1,[103.85,1.28992],[103.89,1.294],[103.83,1.216]
    2,[103.5,1.292],[103.9,1.4],[103.3,1.21]
    3,[103.6,1.291],[103.6,1.39],[103.3,1.29]

Answer 1

使用以下

重写代码

while (scanner.hasNextLine()){
        out.writeUTF(scanner.nextLine()+"\n");
    }

Answer 2

看起来.flush()帮我清除了无效字符......

private byte[] readFile(String path) throws IOException {

    DataOutputStream out = new DataOutputStream(socket.getOutputStream());

    File file = new File(path);
    Scanner scanner = new Scanner(file);

    while (scanner.hasNextLine()){
        out.writeUTF(scanner.nextLine() + System.getProperty("line.separator"));
    }

    byte[] bytes = out.toByteArray();
    out.flush();
    return bytes;
}

What is the purpose of flush() in Java streams?