namespace app\common\exception;
use Exception;
class ApiException extends Exception
{	
	/**
	 * 构造函数
	 */
	public function __construct(array $ApiErrConst, Throwable $previous = null)
	{
		$code = $ApiErrConst[0];
		$message = $ApiErrConst[1];	
		parent::__construct($message, $code, $previous);
	}
}

namespace app\common\exception;
use Exception;
use think\exception\Handle;
use app\common\exception\ApiException;
use app\common\err\ApiErrCode;
class ExceptionHandle extends Handle
{
	// 引入复用模块：JSON返回格式
	use \app\common\traits\ResponseJson; 
	public function render(Exception $e)
	{		
		if($e instanceof ApiException) {
			$code = $e->getCode();
			$message = $e->getMessage();	
		}else{
			$code = $e->getCode();
			if(!$code || $code < 0) {
				$code = ApiErrCode::ERROR_UNKNOW[0];
			}
			$message = $e->getMessage() ? $e->getMessage() : ApiErrCode::ERROR_UNKNOW[1];
		}		
		echo $this->jsonErrorData($code,$message); //该方法在下方
		// 其他错误交给系统处理
       // return parent::render($e); 
	}
}

namespace app\common\err;
class ApiErrCode 
{
	/** 
	 * API通用错误码 const 定义常量
	 * error_code < 1000
	 */	
    const ERROR_UNKNOW = [0, "未知错误"];
    const ERROR_URL = [1, "接口不存在"];
    .......
}

namespace app\common\traits;
trait ResponseJson
{
	/**
	 * API接口出现业务异常时时返回
	 * @author Leo 
	 */
	public function jsonErrorData($code,$message,$data = [])
	{
		return $this->jsonResponse($code, $message, $data);
	}

	/**
	 * API接口请求成功时返回
	 * @author Leo 
	 */
	public function jsonSuccessData($data = [])
	{
		return $this->jsonResponse(200, "Sucess", $data);
	}

	/**
	 * 返回一个JSON
	 * @author Leo 
	 */
	private function jsonResponse($code,$message,$data) 
	{
		$content = [
			'code' => $code,
			'msg' => $message,
			'data' => $data
		];
		return json_encode($content);
	}
}

// 文件头部引入
use app\common\exception\ApiException;
use app\common\err\ApiErrCode;
// 引入复用模块：JSON返回格式
use \app\common\traits\ResponseJson;

// 示例
public function index() {
	throw new ApiException(ApiErrCode::ERROR_URL);		// 自定义异常抛出
}