[Java] 자바 API Key 인증 방식 모듈 및 호출방법

[Java] 자바 API Key 인증 방식 모듈 및 호출방법

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gson 객체 생성시 사용할 DateSerializer

import java.lang.reflect.Type;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public class GsonDateConverterUtil implements JsonSerializer<Date>, JsonDeserializer<Date>{
   private static final String FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";

   public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {

       SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
       try {
           return json == null ? null : simpleDateFormat.parse(json.getAsString());
       } catch (ParseException e) {
           throw new JsonParseException(e);
       }
    }

   public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {

       SimpleDateFormat simpleDateFormat = new SimpleDateFormat(FORMAT);
       return src == null ? null : new JsonPrimitive(simpleDateFormat.format(src));
   }
}

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Api 모듈

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class ApiUtil {
   
   public static String RestCall (String paramUrl,String url, String key){

       try {

    	   String preUrl = "http://xxx.xxx.xxx.xxx:xxxx";
    	   
           URL apiUrl = new URL(preUrl + url);
		   
           HttpURLConnection conn = (HttpURLConnection)apiUrl.openConnection();
           conn.setRequestMethod("POST");
           conn.setRequestProperty("api_key", key);
           conn.setRequestProperty("X-Data-Type", "application/json");
           conn.setRequestProperty("Content-Type", "application/json");
           conn.setDoOutput(true);

           OutputStreamWriter osw = new OutputStreamWriter(conn.getOutputStream(),"UTF-8");
           osw.write(paramUrl);
           osw.flush();
           osw.close();

           BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
           if (conn.getResponseCode() != 200) {
               System.out.println("Failed: HTTP error code : " + conn.getResponseCode());
               throw new RuntimeException("Failed: HTTP error code : " + conn.getResponseCode());
           } else {
               System.out.println("발송 성공");
           }

           String rtnStr = null;
           String line = null;
           while((line = br.readLine()) != null){
               rtnStr = line;
               System.out.println(line);
           }
           br.close();
           conn.disconnect();
           return rtnStr;
       } catch (IOException e) {
           System.out.println("RestCall Fail : " + e.getMessage());
           return null;
       }
   }
}

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사용법

HashMap<String, Object> apiMap = new HashMap();
apiMap.put("test1", "111");
apiMap.put("test2", "222");
apiMap.put("vo1", vo1);

// gson 객체 생성
Gson gson = new GsonBuilder().serializeNulls().setPrettyPrinting().registerTypeAdapter(Date.class, new GsonDateConverterUtil()).create();

// Map 데이터를 jsonString으로 변환
String jsonString = gson.toJson(apiMap);

// 호출
String rtnMsg = ApiUtil.RestCall(jsonString,"/api/xxx/xxx/xxx/xxx/xxx","인증키");

// 응답받은 String 형태의 결과값을 Map으로 변환
Map<String, Object> apiResultMap = new HashMap<String, Object>();
apiResultMap = gson.fromJson(rtnMsg, Map.class);

// Map에서 데이터를 꺼낼 때 예
String code = apiResultMap.get("code").toString();
String data = ((Map<String, Object>)apiResultMap.get("returnData")).get("data").toString();