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How to to fix the error when passing JSON via Socket using Postman

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0

My team is trying to build the application that detects the movement of the object and sending those information(JSON) to server(backend using java). I have tried to get JSON data via socket, but it shows this kind of error. I'm using postman to send JSON to test. Another question is using tomcat to get and post data from browser is better than using socket in this scenario?

public class ThreadedEchoServer 

 static final int PORT = 5000;

 public static void main(String args[]) 
 ServerSocket serverSocket = null;
 Socket socket = null;

 try 
 serverSocket = new ServerSocket(PORT);
 catch (IOException e) 
 e.printStackTrace();

 
 while (true) 
 try 
 socket = serverSocket.accept();
 System.out.println("Client connect...");
 catch (IOException e) 
 System.out.println("I/O error: " + e);
 
 // new thread for a client
 new EchoThread(socket).start();
 
 

public class EchoThread extends Thread 

 protected Socket socket;

 public EchoThread(Socket clientSocket) 
 this.socket = clientSocket;
 

 public void run() 
 InputStream inp = null;
 BufferedReader brinp = null;
 PrintWriter out = null;
 try 
 inp = socket.getInputStream();
 brinp = new BufferedReader(new InputStreamReader(inp));
// out = new PrintWriter(socket.getOutputStream(), true);
 catch (IOException e) 
 return;
 
 String line;

 while (true) 
 try 
 line = brinp.readLine();
 if ((line == null) catch (IOException e) 
 e.printStackTrace();
 return;
 
 
 

Here is json that I used Postman to post request

 "id": 963,
 "result": "United States",
 "cook": 30

But I got this error

Client connect...
Exception in thread "Thread-0" org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]
 at org.json.JSONTokener.syntaxError(JSONTokener.java:505)
 at org.json.JSONObject.<init>(JSONObject.java:215)
 at org.json.JSONObject.<init>(JSONObject.java:399)
 at EchoThread.run(EchoThread.java:34)

java json sockets

share|improve this question

asked Mar 24 at 2:16

newbienewbie

175

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You have shown us some socket code, yet you say you are using Postman. Which method are you actually using?
  
  – Tim Biegeleisen
  Mar 24 at 2:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @TimBiegeleisen Hello Tim. I'm using POST request to send data.
  
  – newbie
  Mar 24 at 2:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @TriDo Postman is communicating using HTTP (which sits on top of TCP); your server code is expecting "raw" TCP. So, the Postman TCP stream will likely start with the verb and wherever you're posting to (assuming you are POSTing): "POST /some/endpoint/here HTTP/1.1". That won't deserialize into JSON.
  
  – Not a JD
  Mar 24 at 4:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NotaJD Hi Nota, Can you give me any suggestion ?
  
  – newbie
  Mar 24 at 4:54
  

  
  
  
  

add a comment | 

0

My team is trying to build the application that detects the movement of the object and sending those information(JSON) to server(backend using java). I have tried to get JSON data via socket, but it shows this kind of error. I'm using postman to send JSON to test. Another question is using tomcat to get and post data from browser is better than using socket in this scenario?

public class ThreadedEchoServer 

 static final int PORT = 5000;

 public static void main(String args[]) 
 ServerSocket serverSocket = null;
 Socket socket = null;

 try 
 serverSocket = new ServerSocket(PORT);
 catch (IOException e) 
 e.printStackTrace();

 
 while (true) 
 try 
 socket = serverSocket.accept();
 System.out.println("Client connect...");
 catch (IOException e) 
 System.out.println("I/O error: " + e);
 
 // new thread for a client
 new EchoThread(socket).start();
 
 

public class EchoThread extends Thread 

 protected Socket socket;

 public EchoThread(Socket clientSocket) 
 this.socket = clientSocket;
 

 public void run() 
 InputStream inp = null;
 BufferedReader brinp = null;
 PrintWriter out = null;
 try 
 inp = socket.getInputStream();
 brinp = new BufferedReader(new InputStreamReader(inp));
// out = new PrintWriter(socket.getOutputStream(), true);
 catch (IOException e) 
 return;
 
 String line;

 while (true) 
 try 
 line = brinp.readLine();
 if ((line == null) catch (IOException e) 
 e.printStackTrace();
 return;
 
 
 

Here is json that I used Postman to post request

 "id": 963,
 "result": "United States",
 "cook": 30

But I got this error

Client connect...
Exception in thread "Thread-0" org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]
 at org.json.JSONTokener.syntaxError(JSONTokener.java:505)
 at org.json.JSONObject.<init>(JSONObject.java:215)
 at org.json.JSONObject.<init>(JSONObject.java:399)
 at EchoThread.run(EchoThread.java:34)

java json sockets

share|improve this question

asked Mar 24 at 2:16

newbienewbie

175

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You have shown us some socket code, yet you say you are using Postman. Which method are you actually using?
  
  – Tim Biegeleisen
  Mar 24 at 2:19
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @TimBiegeleisen Hello Tim. I'm using POST request to send data.
  
  – newbie
  Mar 24 at 2:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @TriDo Postman is communicating using HTTP (which sits on top of TCP); your server code is expecting "raw" TCP. So, the Postman TCP stream will likely start with the verb and wherever you're posting to (assuming you are POSTing): "POST /some/endpoint/here HTTP/1.1". That won't deserialize into JSON.
  
  – Not a JD
  Mar 24 at 4:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NotaJD Hi Nota, Can you give me any suggestion ?
  
  – newbie
  Mar 24 at 4:54
  

  
  
  
  

add a comment | 

My team is trying to build the application that detects the movement of the object and sending those information(JSON) to server(backend using java). I have tried to get JSON data via socket, but it shows this kind of error. I'm using postman to send JSON to test. Another question is using tomcat to get and post data from browser is better than using socket in this scenario?

public class ThreadedEchoServer 

 static final int PORT = 5000;

 public static void main(String args[]) 
 ServerSocket serverSocket = null;
 Socket socket = null;

 try 
 serverSocket = new ServerSocket(PORT);
 catch (IOException e) 
 e.printStackTrace();

 
 while (true) 
 try 
 socket = serverSocket.accept();
 System.out.println("Client connect...");
 catch (IOException e) 
 System.out.println("I/O error: " + e);
 
 // new thread for a client
 new EchoThread(socket).start();
 
 

public class EchoThread extends Thread 

 protected Socket socket;

 public EchoThread(Socket clientSocket) 
 this.socket = clientSocket;
 

 public void run() 
 InputStream inp = null;
 BufferedReader brinp = null;
 PrintWriter out = null;
 try 
 inp = socket.getInputStream();
 brinp = new BufferedReader(new InputStreamReader(inp));
// out = new PrintWriter(socket.getOutputStream(), true);
 catch (IOException e) 
 return;
 
 String line;

 while (true) 
 try 
 line = brinp.readLine();
 if ((line == null) catch (IOException e) 
 e.printStackTrace();
 return;
 
 
 

Here is json that I used Postman to post request

 "id": 963,
 "result": "United States",
 "cook": 30

But I got this error

Client connect...
Exception in thread "Thread-0" org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]
 at org.json.JSONTokener.syntaxError(JSONTokener.java:505)
 at org.json.JSONObject.<init>(JSONObject.java:215)
 at org.json.JSONObject.<init>(JSONObject.java:399)
 at EchoThread.run(EchoThread.java:34)

java json sockets

share|improve this question

asked Mar 24 at 2:16

newbienewbie

175

public class ThreadedEchoServer 

 static final int PORT = 5000;

 public static void main(String args[]) 
 ServerSocket serverSocket = null;
 Socket socket = null;

 try 
 serverSocket = new ServerSocket(PORT);
 catch (IOException e) 
 e.printStackTrace();

 
 while (true) 
 try 
 socket = serverSocket.accept();
 System.out.println("Client connect...");
 catch (IOException e) 
 System.out.println("I/O error: " + e);
 
 // new thread for a client
 new EchoThread(socket).start();
 
 

public class EchoThread extends Thread 

 protected Socket socket;

 public EchoThread(Socket clientSocket) 
 this.socket = clientSocket;
 

 public void run() 
 InputStream inp = null;
 BufferedReader brinp = null;
 PrintWriter out = null;
 try 
 inp = socket.getInputStream();
 brinp = new BufferedReader(new InputStreamReader(inp));
// out = new PrintWriter(socket.getOutputStream(), true);
 catch (IOException e) 
 return;
 
 String line;

 while (true) 
 try 
 line = brinp.readLine();
 if ((line == null) catch (IOException e) 
 e.printStackTrace();
 return;
 
 
 

 "id": 963,
 "result": "United States",
 "cook": 30

Client connect...
Exception in thread "Thread-0" org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]
 at org.json.JSONTokener.syntaxError(JSONTokener.java:505)
 at org.json.JSONObject.<init>(JSONObject.java:215)
 at org.json.JSONObject.<init>(JSONObject.java:399)
 at EchoThread.run(EchoThread.java:34)

share|improve this question

asked Mar 24 at 2:16

newbienewbie

175

share|improve this question

asked Mar 24 at 2:16

newbienewbie

175

asked Mar 24 at 2:16

newbienewbie

175

asked Mar 24 at 2:16

newbienewbie

175