update : 2주차 과제

build.gradle

@@ -24,10 +24,10 @@ repositories {
 }
 
 dependencies {
-    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+    //implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
     implementation 'org.springframework.boot:spring-boot-starter-web'
     compileOnly 'org.projectlombok:lombok'
-    runtimeOnly 'com.mysql:mysql-connector-j'
+    //runtimeOnly 'com.mysql:mysql-connector-j'
     annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'

src/main/java/com/example/week2/Week2Application.java

@@ -7,6 +7,7 @@
 public class Week2Application {
 
   public static void main(String[] args) {
+
     SpringApplication.run(Week2Application.class, args);
   }
 

src/main/java/com/example/week2/builder/App1.java

@@ -1,8 +1,23 @@
 package com.example.week2.builder;
 
+import com.example.week2.exception.CustomException;
+import com.example.week2.exception.ErrorCode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class App1 {
 
+  private static final Logger log = LoggerFactory.getLogger(App1.class);
+
   public static void main(String[] args) {
+    Student student = Student.builder()
+            .age(20)
+            .name("구나현")
+            .school("세종대학교")
+            .build();
+    log.error("에러가 났습니다");
+    System.out.println(student);
 
+    throw new CustomException(ErrorCode.INVALID_REQUEST);
   }
 }

src/main/java/com/example/week2/builder/Student.java

@@ -6,15 +6,16 @@
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
 
 @Getter
 @Setter
 @AllArgsConstructor
-@NoArgsConstructor
 @Builder
 @ToString
+@Slf4j
 public class Student {
-  private String name;
-  private int age;
-  private String school;
+  final private String name;
+  final private int age;
+  final private String school;
 }

src/main/java/com/example/week2/exception/ErrorCode.java

@@ -6,9 +6,11 @@
 
 @Getter
 @AllArgsConstructor
+//enum 상수로 관리
 public enum ErrorCode {
 
-  INVALID_REQUEST(HttpStatus.BAD_REQUEST, "잘못된 요청이 들어왔습니다"),;
+  INVALID_REQUEST(HttpStatus.BAD_REQUEST, "잘못된 요청이 들어왔습니다"),
+  SEJONG_UNI(HttpStatus.BAD_GATEWAY, "출력하고 싶은 메시지");
 
 
   private final HttpStatus status;

src/main/java/com/example/week2/exception/ExceptionController.java

@@ -21,4 +21,9 @@ public void throwIllegalArgumentException() {
     throw new IllegalArgumentException();
   }
 
+  @GetMapping("/custom")
+  public void throwCustomException() {
+    throw new CustomException(ErrorCode.SEJONG_UNI);
+  }
+
 }

src/main/java/com/example/week2/exception/GlobalExceptionHandler.java

@@ -1,13 +1,16 @@
 package com.example.week2.exception;
 
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 
+//rest 붙으면 바디만 반환
 @RestControllerAdvice
 @Slf4j
 public class GlobalExceptionHandler {
 
+  //null pointer exception 을 잡고 메소드 실행 중요!!
   @ExceptionHandler(NullPointerException.class)
   public String handleNullPointerException() {
     log.error("NullPointer Exception 처리 시작");
@@ -19,4 +22,24 @@ public String handleInternalError() {
     log.error("InternalError 처리 시작");
     return "InternalError 핸들링";
   }
+
+  @ExceptionHandler(CustomException.class)
+  public String handleCustomException() {
+    log.error("CustomException 처리 시작");
+    return "CustomException 핸들링";
+  }
+
+  @ExceptionHandler(CustomException.class)
+  public ResponseEntity<ErrorResponse> handleCustomException(CustomException e) {
+    log.error("CustomException 발생: {}", e.getMessage(), e);
+
+    ErrorCode errorCode = e.getErrorCode();
+
+    ErrorResponse response = ErrorResponse.builder()
+            .errorCode(errorCode)
+            .errorMessage(errorCode.getMessage())
+            .build();
+
+    return ResponseEntity.status(errorCode.getStatus()).body(response);
+  }
 }

src/main/java/com/example/week2/exception/GlobalExceptionHandler2.java

@@ -4,6 +4,7 @@
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 
+//rest 가 안붙으면 뷰!! 그래서 error.html 을 찾아서 반환
 @ControllerAdvice
 @Slf4j
 public class GlobalExceptionHandler2 {

src/main/java/com/example/week2/logger/LoggerExample2.java

@@ -2,7 +2,7 @@
 
 import lombok.extern.slf4j.Slf4j;
 
-@Slf4j
+@Slf4j  //logger 를 자동 생성해줌
 public class LoggerExample2 {
 
   public static void main(String[] args) {

src/main/java/com/example/week2/logger/LoggerExample3.java

@@ -14,7 +14,6 @@ public static void main(String[] args) {
         .build();
 
     log.info("학생 이름은" + student.getName() + "입니다");
-
     log.info("학생 이름은 {} 입니다.", student.getName());
   }
 }

src/main/java/com/example/week2/swagger/config/SwaggerConfig.java

@@ -11,9 +11,9 @@ public class SwaggerConfig {
   @Bean
   public OpenAPI openAPI() {
     return new OpenAPI()
-        .info(new Info().title("Alom Spring Study")
-            .version("1.0")
-            .description("Alom Spring Study API 문서"));
+        .info(new Info().title("Alom Spring Study") //제목 지정
+            .version("1.0") //버전 지정
+            .description("Alom Spring Study API 문서"));  //디스크립션 지정
   }
 
 }