使用缓冲读取器获取不同字节的java

Question

当我将一些字节放入客户机socketOutputStream并将它们传递给服务器socket时，出现了一个问题。使用BufferedReader我想读取这些字节，但read（）方法会获取字符，因此在发送范围<-128,-1>...中的字节时，通常会获得不同的值。如何将这些字符转换为我想要的字节

public class Client {

    public static void main(String[] args) {
        Socket s = null;
        InputStream is = null;
        OutputStream os = null;
        try {
            s = new Socket("localhost", 3000);
            is = s.getInputStream();
            os = s.getOutputStream();
            int read;
            String str = "";
            while ((read = is.read()) != '\n') {
                str += (char) read;
            }
            System.out.println(str);
            ByteBuffer b = ByteBuffer.allocate(4);
            b.order(ByteOrder.BIG_ENDIAN);
            b.putInt(430);
            byte[] message = b.array();
            for (int i = 0; i < message.length; i++) {
                System.out.println(message[i] + " ");
            }
            os.write(message);
        } catch (Exception ex) {
        }
    }
}



class Robot extends Thread {

    private Socket s;

    public static void main(String[] args) {
        ServerSocket ss = null;
        try {
            ss = new ServerSocket(3000);
            while (true) {
                Socket s = ss.accept();
                Robot srv = new Robot();
                srv.s = s;
                srv.start();
            }

        } catch (NumberFormatException numberEx) {
            System.out.println("Port of port is not integer");
        } catch (IOException ioEx) {
            System.out.println("Input connection problem");
        } finally {
            try {
                ss.close();
            } catch (IOException ex) {
                ex.printStackTrace();
                Logger.getLogger(Robot.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }

    @Override
    public void run() {
        BufferedReader is = null;
        OutputStream os = null;
        try {
            is = new BufferedReader(new InputStreamReader(s.getInputStream()));
            os = s.getOutputStream();
            os.write("Send me data:\n".getBytes());
            int b;
            while ((b = is.read()) != -1) {
                System.out.println((byte) b + " ");
            }
        } catch (Exception ex) {
        }
    }
}

Answer 1

读取器将接收到的字节转换为字符，并使用系统属性file.encoding（您可以更改它）

如果您需要字符（字符串），则必须使用已知编码（如UTF-8）对其进行解码和编码。在客户端和服务器上应该（必须）相同

如果你只需要字节（没有字符，没有字符串），你应该只使用流，没有读卡器