// 使用Record优化DTO
public record UserDTO(
    @NotBlank String username,
    @Email String email
) {}
// 密封接口定义响应类型
public sealed interface ApiResponse 
    permits SuccessResponse, ErrorResponse {}
# 需要JDK17+GraalVM22.3+
./gradlew bootBuildImage --imageName=myapp:native
@NativeHint(
  resources = @ResourceHint(patterns = "META-INF/native-image/*"),
  types = @TypeHint(types = JacksonAutoConfiguration.class)
)
public class NativeConfig {}
# application.properties
spring.main.lazy-initialization=true
spring.jpa.open-in-view=false
spring.devtools.restart.enabled=false
# 生产环境安全获取堆内存快照
jcmd  GC.heap_dump /tmp/heap.hprof
 @ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler
    public ProblemDetail handleValidationException(MethodArgumentNotValidException ex) {
        ProblemDetail problem = ProblemDetail.forStatus(HttpStatus.BAD_REQUEST);
        problem.setProperty("timestamp", Instant.now());
        ex.getBindingResult().getFieldErrors().forEach(error -> {
            problem.setProperty(error.getField(), error.getDefaultMessage());
        });
        return problem;
    }
}
@HttpExchange(url = "/api/users", accept = "application/json")
public interface UserClient {
    @GetExchange("/{id}")
    User getUser(@PathVariable Long id);
    @PostExchange
    ResponseEntity createUser(@RequestBody User user);
}
 management:
  endpoint:
    health:
      probes:
        enabled: true
      show-details: always
  health:
    db:
      enabled: true
    diskspace:
      enabled: true
@Bean
MeterBinder queueSize(Queue queue) {
    return registry -> Gauge.builder("queue.size", queue::size)
                           .register(registry);
}
src/main/resources/
├── application-dev.yaml
├── application-prod.yaml
└── application-local.yaml
java -jar myapp.jar --spring.profiles.active=prod
@Configuration
@EnableWebSecurity
public class SecurityConfig {
    @Bean
    SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        return http
            .authorizeHttpRequests(auth -> auth
                .requestMatchers("/public/**").permitAll()
                .anyRequest().authenticated()
            )
            .csrf(csrf -> csrf.ignoringRequestMatchers("/api/**"))
            .sessionManagement(session -> session
                .sessionCreationPolicy(SessionCreationPolicy.STATELESS))
            .build();
    }
}
结语:Spring Boot 3.0在性能与开发体验上实现了质的飞跃。你在升级过程中遇到哪些挑战?欢迎在评论区留下你的实战经验!
写在最后
哈喽!大家好呀,我是 Code_Cracke,一名热爱编程的小伙伴。在这里,我将分享一些实用的开发技巧和经验心得。如果你也对编程充满热情,欢迎关注并一起交流学习!如果你对这篇文章有任何疑问、建议或者独特的见解,欢迎在评论区留言。无论是探讨技术细节,还是分享项目经验,都能让我们共同进步。
本文来自博客园,作者:Code_Cracke,转载请注明原文链接:https://www.cnblogs.com/proer-blog/p/18744999
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