use AuthenticatesUsers;

public function login(Request $request)
{
    $this->validateLogin($request);
    if ($this->attemptLogin($request)) {
      $user = $this->guard()->user();
      $user->generateToken();
      $ret=new RetObject();
      $ret->retCode="0000";
      $ret->retMsg='success';
      $ret->data= $user->toArray();
    }else{
      $ret=new RetObject();
      $ret->retCode="0001";
      $ret->retMsg='failed';
      $ret->data= null;
    }
    return response()->json($ret);
}

Route::post('register', 'Auth\RegisterController@register');

use RegistersUsers;
RegistersUsers的register
public function register(Request $request)
{
    $this->validator($request->all())->validate();
    event(new Registered($user = $this->create($request->all())));
    $this->guard()->login($user);
    return $this->registered($request, $user)
            "htmlcode">

protected function registered(Request $request,$user)
{
  $user->generateToken();
  $ret=new RetObject();
  $ret->retCode="0000";
  $ret->retMsg='register success';
  $ret->data= $user->toArray();
  return response()->json($ret);
}




然后在哪里捕捉异常然后失败的时候修改数据返回格式，捣鼓了好久。
一开始尝试直接在RegisterController中的registered()方法中使用try/catch捕捉异常信息，但是每次Debug都不会跳进来，直接在更底层验证的时候就直接输出报错信息了。


try{
  $user->generateToken();
  $ret=new RetObject();
  $ret->retCode="0000";
  $ret->retMsg='register success';
  $ret->data= $user->toArray();
  return response()->json($ret);
}catch (Exception $exception){
  $ret=new RetObject();
  $ret->retCode="0001";
  $ret->retMsg='register failed';
  $ret->data= null;
  return response()->json($ret);
}




最终在app/Exception/Handler.php中
report方法是用来将异常写入日志，render是用来渲染各种异常的浏览器输出
所以我们应该是在render中修改捕捉到异常之后返回数据的格式


public function render($request, Exception $exception)
{
    // This will replace our 404 response with
    // a JSON response.
    if ($exception instanceof ModelNotFoundException &&
      $request->wantsJson())
    {
      $ret=new RetObject();
      $ret->retCode="404";
      $ret->retMsg='页面未找到';
      $ret->data= null;
      return response()->json($ret);
    }elseif ($exception instanceof ValidationException)
    {
      $ret=new RetObject();
      $ret->retCode="0001";
      $ret->retMsg=$exception->getMessage();
      $ret->data= null;
      return response()->json($ret);
    }
    return parent::render($request, $exception);
}




然后起码是可以自定义捕捉到验证数据异常ValidationException 时候的返回数据格式了，还有其他的异常也是可以直接在Handler.php的render方法中添加。
补充一下Handler的异常处理的控制器基类：目录为vendor/laravel/framework/src/Illuminate/Foundation/Exception/Handler.php
中的report和render方法


public function report(Exception $e)
{
    if ($this->shouldntReport($e)) {
      return;
    }
    try {
      $logger = $this->container->make(LoggerInterface::class);
    } catch (Exception $ex) {
      throw $e; // throw the original exception
    }
    $logger->error($e);
}
public function render($request, Exception $e)
{
    $e = $this->prepareException($e);
    if ($e instanceof HttpResponseException) {
      return $e->getResponse();
    } elseif ($e instanceof AuthenticationException) {
      return $this->unauthenticated($request, $e);
    } elseif ($e instanceof ValidationException) {
      return $this->convertValidationExceptionToResponse($e, $request);
    }
    return $this->prepareResponse($request, $e);
}




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