[#43] refactor: String content > MediaType 상수 변환

src/main/java/com/study/realworld/security/JwtAuthenticationEntiyPoint.java

@@ -4,19 +4,18 @@
 import java.io.IOException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import org.springframework.http.MediaType;
 import org.springframework.security.core.AuthenticationException;
 import org.springframework.security.web.AuthenticationEntryPoint;
 import org.springframework.stereotype.Component;
 
 @Component
 public class JwtAuthenticationEntiyPoint implements AuthenticationEntryPoint {
 
-    private static final String CONTENT_TYPE = "application/json";
-
     @Override
     public void commence(HttpServletRequest request, HttpServletResponse response,
         AuthenticationException authException) throws IOException {
-        response.setContentType(CONTENT_TYPE);
+        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
         response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
 
         response.getWriter().write(ErrorResponse.toJson(authException));

src/main/java/com/study/realworld/security/JwtExceptionFilter.java

@@ -9,6 +9,7 @@
 import javax.servlet.http.HttpServletResponse;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.http.MediaType;
 import org.springframework.stereotype.Component;
 import org.springframework.web.filter.OncePerRequestFilter;
 
@@ -17,8 +18,6 @@ public class JwtExceptionFilter extends OncePerRequestFilter {
 
     private final Logger log = LoggerFactory.getLogger(getClass());
 
-    private static final String CONTENT_TYPE = "application/json";
-
     @Override
     protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
         throws ServletException, IOException {
@@ -32,7 +31,7 @@ protected void doFilterInternal(HttpServletRequest request, HttpServletResponse
     }
 
     private void sendErrorMessage(HttpServletResponse response, JwtException e) throws IOException {
-        response.setContentType(CONTENT_TYPE);
+        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
         response.setStatus(e.getHttpStatusValue());
 
         response.getWriter().write(ErrorResponse.toJson(e));