如何在Java中将数组写入OutputStream？

Question

我想发送多个随机值Socket。我认为数组是发送它们的最佳方法。但是我不知道如何向Socket写一个数组OutputStream？

我的Java课：

导入java.io.ByteArrayOutputStream; 导入java.io.IOException; 导入java.io.InputStream;
导入java.net.Socket; 导入java.io. *; 导入java.util.Random;

public class NodeCommunicator {

    public static void main(String[] args) {
        try {
            Socket nodejs = new Socket("localhost", 8181);

            Random randomGenerator = new Random();
            for (int idx = 1; idx <= 1000; ++idx){
                Thread.sleep(500);
                int randomInt = randomGenerator.nextInt(35);
                sendMessage(nodejs, randomInt + " ");
                System.out.println(randomInt);
            }

            while(true){
                Thread.sleep(1000);
            }
        } catch (Exception e) {
            System.out.println("Connection terminated..Closing Java Client");
            System.out.println("Error :- "+e);
        }
    }

    public static void sendMessage(Socket s, String message) throws IOException {
        s.getOutputStream().write(message.getBytes("UTF-8"));
        s.getOutputStream().flush();
    }

}

Answer 1

使用java.io.DataOutputStream / DataInputStream对，他们知道如何读取int。以长度+随机数的数据包形式发送信息。

发件人

Socket sock = new Socket("localhost", 8181);
DataOutputStream out = new DataOutputStream(sock.getOutputStream());
out.writeInt(len);
for(int i = 0; i < len; i++) {
      out.writeInt(randomGenerator.nextInt(35))
...

接收者

 DataInputStream in = new DataInputStream(sock.getInputStream());
 int len = in.readInt();
 for(int i = 0; i < len; i++) {
      int next = in.readInt();
 ...