네트워크연계유틸추가

src/main/java/com/kamco/cd/kamcoback/common/utils/NetUtils.java

@@ -0,0 +1,64 @@
+package com.kamco.cd.kamcoback.common.utils;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import java.net.InetAddress;
+import java.net.URLEncoder;
+import java.net.UnknownHostException;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import org.mindrot.jbcrypt.BCrypt;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+
+public class NetUtils {
+
+  public String getLocalIP(){
+
+    String ip;
+    {
+      try {
+        InetAddress local = InetAddress.getLocalHost();
+        ip = local.getHostAddress();
+      } catch (UnknownHostException e) {
+        throw new RuntimeException(e);
+      }
+    }
+
+    return ip;
+  }
+
+
+  public String dtoToQueryString(Object dto, String queryString) {
+    ObjectMapper objectMapper = new ObjectMapper();
+    // 1. DTO를 Map으로 변환
+    Map<String, Object> map = objectMapper.convertValue(dto, Map.class);
+
+    String qStr = map.entrySet().stream()
+      .filter(entry -> entry.getValue() != null) // null 제외
+      .map(entry -> String.format("%s=%s",
+        entry.getKey(),
+        URLEncoder.encode(entry.getValue().toString(), StandardCharsets.UTF_8)))
+      .collect(Collectors.joining("&"));
+
+    if( queryString == null || queryString.isEmpty() ) {
+      queryString = "?"+qStr;
+    }else{
+      queryString = queryString +"&" + qStr;
+    }
+
+    // 2. Map을 쿼리 스트링 문자열로 변환
+    return queryString;
+  }
+
+  public HttpHeaders jsonHeaders() {
+    HttpHeaders headers = new HttpHeaders();
+    headers.setContentType(MediaType.APPLICATION_JSON);
+    headers.setAccept(List.of(MediaType.APPLICATION_JSON));
+
+    return headers;
+  }
+
+}