Validation in Spring Boot

title: Validation in Spring Boot description: Request data validation

Dependency

xml exampleWoHoTech

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

Entity Validation Annotations

public class StudentDTO { @NotNull(message = "Name required hai") @NotBlank(message = "Name empty nahi hona chahiye") @Size(min = 2, max = 50, message = "Name 2-50 characters ka hona chahiye") private String name; @Min(value = 1, message = "Age minimum 1 hona chahiye") @Max(value = 120, message = "Age maximum 120 hona chahiye") private int age; @DecimalMin(value = "0.0", message = "Marks negative nahi hone chahiye") @DecimalMax(value = "100.0", message = "Marks 100 se zyada nahi ho sakte") private double marks; @Email(message = "Valid email format chahiye") private String email; @Pattern(regexp = "^[0-9]{10}$", message = "10 digit phone number chahiye") private String phone; }

Controller mein use

java exampleWoHoTech

@PostMapping
public ResponseEntity<?> create(@RequestBody @Valid StudentDTO dto, BindingResult result) {
    if (result.hasErrors()) {
        Map<String, String> errors = new HashMap<>();
        result.getFieldErrors().forEach(e -> errors.put(e.getField(), e.getDefaultMessage()));
        return ResponseEntity.badRequest().body(errors);
    }
    return ResponseEntity.ok(service.create(dto));
}

Global Exception Handler

java exampleWoHoTech

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<Map<String, String>> handleValidation(MethodArgumentNotValidException ex) {
        Map<String, String> errors = new HashMap<>();
        ex.getBindingResult().getFieldErrors()
            .forEach(e -> errors.put(e.getField(), e.getDefaultMessage()));
        return ResponseEntity.badRequest().body(errors);
    }
}

title: Validation in Spring Boot description: Request data validation

Dependency

xml exampleWoHoTech

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

Entity Validation Annotations

Controller mein use

java exampleWoHoTech

@PostMapping
public ResponseEntity<?> create(@RequestBody @Valid StudentDTO dto, BindingResult result) {
    if (result.hasErrors()) {
        Map<String, String> errors = new HashMap<>();
        result.getFieldErrors().forEach(e -> errors.put(e.getField(), e.getDefaultMessage()));
        return ResponseEntity.badRequest().body(errors);
    }
    return ResponseEntity.ok(service.create(dto));
}

Global Exception Handler

java exampleWoHoTech

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<Map<String, String>> handleValidation(MethodArgumentNotValidException ex) {
        Map<String, String> errors = new HashMap<>();
        ex.getBindingResult().getFieldErrors()
            .forEach(e -> errors.put(e.getField(), e.getDefaultMessage()));
        return ResponseEntity.badRequest().body(errors);
    }
}

Validation in Spring Boot

Dependency

Entity Validation Annotations

Controller mein use

Global Exception Handler

Continue learning this concept

Validation in Spring Boot

Dependency

Entity Validation Annotations

Controller mein use

Global Exception Handler

Continue learning this concept