NewLines在写信给ByteArrayOutputStream时丢失

Question

我正在尝试使用Socket读取txt文件并从其中传递数据，但在编写输出流时，我似乎缺少了换行符。

我的txt文件是：

{
  "firstName": "John",
  "lastName": "Smith",
  "isAlive": true,
  "age": 25,
  "address": {
    "streetAddress": "21 2nd Street",
    "city": "New York",
    "state": "NY",
    "postalCode": "10021-3100"
  }
}

ByteArrayOutputStream：

{ "firstName"："John"，"lastName"："Smith"，"isAlive"：true，"age"：25，"address"：{% "streetAddress"："21 21“，"city"："New York"，"state"："NY"， "postalCode"："10021-3100“}

Scaner：

​

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;
}

编辑：

System.getProperty("line.separator"); 

帮助我创建新行，但在baos中仍然有一些无效字符

System.out.println(new String(baos.toByteArray()));

​

​

Answer 1

看来.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?

Answer 2

使用下面的代码重写代码

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