一、前言LlamaIndex 高并发优化线程池、异步处理与缓存策略实战是 Java 后端开发中的核心知识点。本文覆盖LlamaIndex、高并发、性能优化配有完整可运行的代码示例。二、核心实现2.1 SpringBoot 项目结构// 标准 SpringBoot 控制器 RestController RequestMapping(/api/users) public class UserController { private final UserService userService; public UserController(UserService userService) { this.userService userService; } GetMapping(/{id}) public ResultUserDTO getUser(PathVariable Long id) { return Result.ok(userService.getUserById(id)); } PostMapping public ResultVoid createUser(RequestBody Valid CreateUserRequest request) { userService.createUser(request); return Result.ok(); } }2.2 Service 层实现Service Slf4j public class UserService { private final UserRepository userRepository; private final PasswordEncoder passwordEncoder; Transactional(rollbackFor Exception.class) public UserDTO createUser(CreateUserRequest request) { // 参数校验 if (userRepository.existsByEmail(request.getEmail())) { throw new BusinessException(邮箱已被注册); } // 密码加密 User user new User(); user.setEmail(request.getEmail()); user.setPassword(passwordEncoder.encode(request.getPassword())); user.setCreatedAt(LocalDateTime.now()); User saved userRepository.save(user); log.info(创建用户成功: {}, saved.getEmail()); return toDTO(saved); } Cacheable(value user, key #id) public UserDTO getUserById(Long id) { return userRepository.findById(id) .map(this::toDTO) .orElseThrow(() - new ResourceNotFoundException(用户不存在)); } private UserDTO toDTO(User user) { return new UserDTO(user.getId(), user.getEmail(), user.getCreatedAt()); } }三、异常处理与全局响应3.1 统一异常处理RestControllerAdvice public class GlobalExceptionHandler { ExceptionHandler(BusinessException.class) public ResultVoid handleBusiness(BusinessException e) { log.warn(业务异常: {}, e.getMessage()); return Result.fail(e.getCode(), e.getMessage()); } ExceptionHandler(MethodArgumentNotValidException.class) public ResultVoid handleValidation(MethodArgumentNotValidException e) { String message e.getBindingResult().getFieldErrors().stream() .map(FieldError::getDefaultMessage) .collect(Collectors.joining(, )); return Result.fail(400, message); } ExceptionHandler(Exception.class) public ResultVoid handleOther(Exception e) { log.error(未知异常, e); return Result.fail(500, 系统繁忙请稍后重试); } }3.2 统一响应封装Data public class ResultT { private int code; private String message; private T data; public static T ResultT ok() { return ok(null); } public static T ResultT ok(T data) { ResultT r new Result(); r.setCode(0); r.setMessage(success); r.setData(data); return r; } public static T ResultT fail(int code, String message) { ResultT r new Result(); r.setCode(code); r.setMessage(message); return r; } }四、数据库操作4.1 MyBatis-Plus CRUDMapper public interface UserMapper extends BaseMapperUser { Select(SELECT * FROM users WHERE email #{email} LIMIT 1) User findByEmail(Param(email) String email); } Service public class UserService { Autowired private UserMapper userMapper; public PageUser listUsers(int page, int pageSize) { PageUser p new Page(page, pageSize); return userMapper.selectPage(p, new QueryWrapperUser() .eq(status, 1) .orderByDesc(created_at)); } }五、性能优化5.1 连接池配置# application.yml spring: datasource: url: jdbc:mysql://localhost:3306/mydb?useSSLfalseserverTimezoneAsia/Shanghai driver-class-name: com.mysql.cj.jdbc.Driver username: root password: secret hikari: maximum-pool-size: 20 minimum-idle: 5 idle-timeout: 300000 connection-timeout: 20000 max-lifetime: 12000005.2 异步任务Async(taskExecutor) public CompletableFutureVoid sendEmail(String to, String content) { log.info(发送邮件到: {}, to); // 邮件发送逻辑 return CompletableFuture.completedFuture(null); }六、总结SpringBoot 的核心是约定优于配置——善用注解和自动配置所有外部输入必须校验——用ValidBindingResult异常要分类处理——业务异常和系统异常分开连接池合理配置——根据并发量调整 pool size收藏本文关注我后续更新更多 Java 实战系列。觉得有用的话点个赞收藏关注我持续更新优质技术内容标签LlamaIndex | 高并发 | 性能优化 | 线程池 | 后端