导入文件

导入文件：实例化上传类，设置附件上传大小，上传类型，上传文件

  public function upload(){
     
      $upload=new \Think\Upload();//实例化上传类
      $upload->maxSize=0;//设置附件上传大小
      $upload->exts=array('csv');//上传类型
      $upload->rootPath='./Public/Upload/';//设置附件上传根目录
      $upload->savePath='';//设置附件上传（子）目录
      //上传文件
      $info=$upload->upload();
      if(!$info){
         //上传错误提示错误信息
         $this->error($upload->getError());
      }else{
         //上传成功
         $this->import($upload->rootPath.$info['file']['savepath'].$info['file']['savename']);
     }
   }
   public function import($file){
      $encoding=detect_encoding($file);

      //如果不是utf-8转换utf-8
      if($encoding!='UTF-8'){
         $contents=file_get_contents($file);
         $contents=mb_convert_encoding($contents,'utf-8', $encoding);
         file_put_contents($file, $contents);
        
      }
      $fp=fopen($file, 'r');
         if($fp){

          $fields=array('no','name','sex');
          $model=M('student');
           
          $arrNO=$model->getField('no',true);
          $arr = array();
          while(($row = fgetcsv($fp,1000,","))!== false){
             $row=array_combine($fields, $row);
              // dump($data);
              // exit;
              $name = $row['name'];
              $row['py'] = SpGetPinyin($name);

             if(in_array($row['no'],$arrNO)){
                $file = './Public/uploads/demo.txt';
                $current .= $row['no']."已存在\r\n";
             }else{
                $arrNO[]=$row['no'];
                $arr[]=$row;
                $file = './Public/uploads/demo.txt';
                $current .= $row['no']."导入成功\r\n";
             }
             if(count($arr)==1000){
                $model->addAll($arr);
                unset($arr);
             } 
          }
            if(count($arr)>0){
               $model->addAll($arr);
            }
           $this->success("导入成功",'index');
         }
         file_put_contents($file, $current);
         $file_name = "demo.txt";
         $file_dir = "./Public/uploads/";
         if(!file_exists($file_dir.$file_name)){
          echo "文件找不到";
          exit;
         }else{
          $file = fopen($file_dir.$file_name,"r");
          Header("content-type:application/octet-stream");
          Header("Accept-Ranges:bytes");
          Header("Accept-Length:".filesize($file_dir.$file_name));
          Header("Content-Disposition:attachment;filename=".$file_name);
          echo fread($file,filesize($file_dir.$file_name));
          fclose($file);
          exit;
    }  
  }

然后改变编码格式，改成UTF8样式，然后把表里的文件传到数组中，要循环判断，判断是否有重复的数据，进行报错或者成功。