Java에서 socket을 사용하여 JSON 응답을 보내는 방법

Question

기본 HTTP 서버를 구축했으며 GET 요청에 대한 응답을 보내려고합니다. Gson을 JSON 파서로 설치했지만 JSON에서 응답을 인코딩하고 클라이언트에게 다시 보내는 방법을 모르겠습니다.

여기 내 코드입니다, 어떤 도움을 많이 주시면 감사하겠습니다. (실제 응답을위한 마지막 방법)

public class HttpServer extends Thread{ 

    //Private variables 
    private Socket connectedClient = null; 
    private BufferedReader clientRequest = null; 
    private DataOutputStream responseToClient = null; 

    /** 
    * Public constructor 
    * @param client 
    */ 
    public HttpServer(Socket client){ 
     connectedClient =client; 
    } 

    /** 
    * Code to execute on thread 
    */ 
    public void run(){ 

     try { 

      //Log new client 
      System.out.println("The client " + connectedClient.getInetAddress() + 
        ":" + connectedClient.getPort() + " is connected"); 

      //Get the client request 
      clientRequest = new BufferedReader(new InputStreamReader(connectedClient.getInputStream())); 

      //Start response object 
      responseToClient = new DataOutputStream(connectedClient.getOutputStream()); 

      //Process the request 
      processClientRequest(); 

      //Close buffered writer 
      responseToClient.close(); 
     } catch (Exception e) { 

      //Print error 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Parses a client request and calls the approriate handler 
    * @throws Exception 
    */ 
    private void processClientRequest() throws Exception{ 

     String requestString = clientRequest.readLine(); 

     String header = requestString; 

     //Break up request 
     StringTokenizer tokenizer = new StringTokenizer(header); 

     //Different request parts 
     String httpMethod = tokenizer.nextToken(); 
     String httpQueryString = tokenizer.nextToken(); 

     //Print client request 
     StringBuffer responseBuffer = new StringBuffer(); 
     while (clientRequest.ready()) { 
      responseBuffer.append(requestString + " "); 
      System.out.println(requestString); 

      requestString = clientRequest.readLine(); 
     } 
     //ID GET request 
     if (requestString.equals("GET")) { 
      if (httpQueryString.equals("/")) { 
       sendResponse(); 

      } 
     } 
    } 

    /** 
    * Sends reply back to client 
    * @throws Exception 
    */ 
    private void sendResponse() throws Exception{ 

     HashMap<String, String> mapResponse = new HashMap<String, String>(); 
     mapResponse.put("A", "Hands"); 
     mapResponse.put("B", "Feet"); 

     //Convert to JSON and send back to client 
     //????????????????????????????? 
    } 
} 

Answer 1

당신이 GSON에 대한 user guide 봤어? 나는 당신이 Reading from and Writing to a Socket 다시 소켓 모양에 데이터를 기입하기

Gson gson = new Gson(); 
String json = gson.toJson(mapResponse); 

의 라인을 따라 뭔가를하려는 생각한다. 작동 할 수도 있습니다 :

new PrintWriter(responseToClient, true).println(json); 

Answer 2

는 그냥 아닌가요 :

Gson gson = new Gson(); 
String json = gson.toJson(mapResponse); 
//Other code to send it back to client