Question

我买了一个gps，我用sms消息测试了这个，并用自己的软件来检索lat / long，它工作正常，请看截图： enter image description here

现在我确信与gprs->internet的通信有效，所以我想创建自己的软件，可以执行软件制造商不具备的许多其他功能。在我的第一次反思中，我尝试在端口7070上使用socket tcp / ip（java）监听NMEA消息，这是我的源代码：

 import java.io.*;
 import java.net.*;


 public class Serveur {
 static final int port = 7070;
  public static void main(String[] args) throws Exception {              

    ServerSocket s = new ServerSocket(port);
    System.out.println("waiting for connexion from GPS 7070");
    Socket socClient = s.accept();
    System.out.println("Connexion GPS ok");

           BufferedReader in = new BufferedReader(
                           new InputStreamReader(socClient.getInputStream())
                          ); 
            PrintWriter out = new PrintWriter(
                         new BufferedWriter(
                            new OutputStreamWriter(socClient.getOutputStream())), 
                         true);   
    String str = in.readLine(); 

    System.out.println("the GPS message  is : " + str);         

    in.close();
    out.close();

    socClient.close();
  } 
  }

我尝试通过本地网络上的java客户端发送消息，但它可以工作..

但我不明白的问题是：当我收到来自GPS的消息时，我收到此错误：

waiting for connexion from GPS 7070
Connexion GPS ok
Exception in thread "main" java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
    at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
    at sun.nio.cs.StreamDecoder.read(Unknown Source)
    at java.io.InputStreamReader.read(Unknown Source)
    at java.io.BufferedReader.fill(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at serveur.Serveur.main(Serveur.java:27)