SpringBoot结果封装和异常拦截的实现示例

public class CommonResult<T> {
    private int code;  // 响应状态码
    private String msg;  // 响应消息
    private T data;  // 响应数据
    // 构造器
    public CommonResult() {}
    public CommonResult(int code, String msg, T data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
    // 省略 Getter 和 Setter 方法
}

public enum ResponseCode {
    SUCCESS(200, "操作成功"),
    FAIL(500, "操作失败");
    // 状态码和状态信息
    private final int code;
    private final String message;
    // 构造器
    private ResponseCode(int code, String message) {
        this.code = code;
        this.message = message;
    }
    // Getter 方法
    public int getCode() {
        return code;
    }
    public String getMessage() {
        return message;
    }
}

public class BizException extends RuntimeException {
    private int code;
    public BizException(ResponseCode responseCode) {
        super(responseCode.getMessage());
        this.code = responseCode.getCode();
    }
    // Getter 方法
    public int getCode() {
        return code;
    }
}

@RestControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(Exception.class)
    public CommonResult<String> handleException(Exception e) {
        log.error("系统异常：{}", e.getMessage());
        return new CommonResult<>(ResponseCode.FAIL.getCode(), "系统错误，请联系管理员", null);
    }
    @ExceptionHandler(BizException.class)
    public CommonResult<String> handleBizException(BizException e) {
        log.error("业务异常：{}", e.getMessage());
        return new CommonResult<>(e.getCode(), e.getMessage(), null);
    }
}

@RestController
@RequestMapping("/api")
public class UserController {
    // 省略注入代码
    @GetMapping("/users/{id}")
    public CommonResult<User> getUserById(@PathVariable("id") Long id) {
        User user = userService.getUserById(id);
        if (null != user) {
            return new CommonResult<>(ResponseCode.SUCCESS.getCode(), ResponseCode.SUCCESS.getMessage(), user);
        } else {
            throw new BizException(ResponseCode.FAIL);
        }
    }
}