laravel实现图片上传预览,及编辑时可更换图片,并

/***
   * 添加商户
   * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
   */
  public function add()
  {
 
    $data = null;
    return _view('admin.merchant.merchant.edit', compact('data'));
  }
 
  /***
   * 添加商户
   * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
   */
  public function store(StoreMenchantRequest $request)
  {
    //判断手机号是否重复 重复不能添加
    //后面开发可能会去掉这个判断
    $merchant = Merchant::where('mobile', $request->mobile)->first();
    if (!empty($merchant)) {
      return back()->withErrors('该用户已存在');
    }
    $token = str_random(60);
    $api_token = $this->getToken($token);
    $newMerchantData = [
      'mobile' => $request->mobile,
      'api_token' => $api_token,
    ];
    DB::beginTransaction();
    $newMerchant = Merchant::create($newMerchantData);
    $newData = [
      'merchant_id' => $newMerchant->id,//Merchantid
      'merchant_principal' => $request->merchant_principal,//负责人
      'merchant_name' => $request->merchant_name,//商家名称
      'merchant_short_name' => $request->merchant_short_name,//商家简称
      'merchant_address' => $request->merchant_address,//商家地址
      'business_num' => $request->business_num,//注册号
      'business_address' => $request->business_address,//营业地址
      'business_name' => $request->business_name,//营业执照名称
      'business_person' => $request->person,//营业执照法人
      'identity_name' => $request->person,//身份证姓名
      'identity_num' => $request->identity_num,//身份证号
    ];
    //上传缩略图
    $input = $request->all();
    if (isset($input['file']) && is_object($input['file'])) {
 
      $file_name = save_image_file($input['file'], 'merchant_infos');
      if (!$file_name) {
        return back()->with('msg', '图片上传失败,请重试!');
      }
//      dd($file_name);
      $input['thumbnail'] = $file_name;
      unset($input['_token']);
      unset($input['file']);
    } else {
      return back()->with('msg', '请上传图片');
    }
    //上传内景图1
    if (isset($input['image1']) && is_object($input['image1'])) {
 
      $file_name_1 = save_image_file($input['image1'], 'merchant_infos');
      if (!$file_name_1) {
        return back()->with('msg', '图片上传失败,请重试!');
      }
 
      $input['interior_figure_one'] = $file_name_1;
      unset($input['_token']);
      unset($input['image1']);
    } else {
      return back()->with('msg', '请上传图片');
    }
    //上传内景图2
    if (isset($input['image2']) && is_object($input['image2'])) {
 
      $file_name_2 = save_image_file($input['image2'], 'merchant_infos');
      if (!$file_name_2) {
        return back()->with('msg', '图片上传失败,请重试!');
      }
      $input['interior_figure_two'] = $file_name_2;
      unset($input['_token']);
      unset($input['image2']);
    } else {
      return back()->with('msg', '请上传图片');
    }
    //上传内景图3
    if (isset($input['image3']) && is_object($input['image3'])) {
 
      $file_name_3 = save_image_file($input['image3'], 'merchant_infos');
      if (!$file_name_3) {
        return back()->with('msg', '图片上传失败,请重试!');
      }
      $input['interior_figure_three'] = $file_name_3;
      unset($input['_token']);
      unset($input['image3']);
    } else {
      return back()->with('msg', '请上传图片');
    }
 
    $merchantInfo = MerchantInfo::where('merchant_id', $newMerchant->id)->first();
    if (!empty($merchantInfo)) {
      return back()->withErrors('该用户已录入信息');
    }
    $homestayInfo = HomestayInfo::where('merchant_id', $newMerchant->id)->first();
    if (!empty($homestayInfo)) {
      return back()->withErrors('该用户已录入信息');
    }
    //录入商户信息
    $newData['thumbnail'] = $input['thumbnail'];
    $newData['interior_figure_one'] = $input['interior_figure_one'];
    $newData['interior_figure_two'] = $input['interior_figure_two'];
    $newData['interior_figure_three'] = $input['interior_figure_three'];
    $newData['content'] = $input['content'];
    $newMerchantInfo = MerchantInfo::create($newData);
    $newHomestayInfo = HomestayInfo::create($newData);
    if ($newMerchantInfo && $newHomestayInfo && $newMerchant) {
      DB::commit();
      admin_action_logs($newMerchant, "添加商户成功");
      return redirect()->route('admin.merchant.index')->with('msg', '添加成功');
    } else {
      DB::rollback();
      return back()->withErrors('添加失败，请联系管理员');
    }
 
 
  }