如何将文件上传到struts 2中的特定文件夹

Question

我想从struts动作上传文件。我需要在该操作中获取文件夹的路径：

我尝试使用

String contextPath = request.getContextPath();

但我得到了java.lang.NullPointerException

Answer 1

将Catalina存储为项目文件夹的父文件夹

      String rootPath = System.getProperty("catalina.home");
      File dir = new File(rootPath + File.separator + "yourfolderName");
      if (!dir.exists())
          dir.mkdirs();

      // Create the file on server
      java.util.Date date= new java.util.Date();
      String Path = dir.getAbsolutePath() + File.separator + (new Timestamp(date.getTime())).toString().replace(":", "").toString().replace(".", ".").toString().replace(" ","").toString().replace("-","").toString()+".pdf";

或者在项目中创建一个文件夹并存储在那里。

if (!file.isEmpty()) {
    //filter for checking file extewnsion
    if(file.getContentType().equalsIgnoreCase("image/jpg") || file.getContentType().equalsIgnoreCase("image/jpeg")){
        //if file is >2 MB or < 2MB
        double size = file.getSize();
        double kilobytes = (size / 1024);
        double megabytes = (kilobytes / 1024);
        if(megabytes<2){
    try {
        byte[] bytes = file.getBytes();
        String filePath = request.getRealPath("/")+"yourFolderName\\ProfileImages\\"+SessionManagement.getUserName()+".jpg";
        BufferedOutputStream stream =
                new BufferedOutputStream(new FileOutputStream(new File(filePath)));
        stream.write(bytes);
        stream.close();

        //console call
    }
    else{
        model.put("error", "Please select File less than 2 MB");
        return new ModelAndView("uploadPhotoTile");
    }
    }else{
        model.put("error", "Please select JPEG File");
        return new ModelAndView("uploadPhotoTile");
    }
} else {
    model.put("error", "Please select File");
    return new ModelAndView("uploadPhotoTile");
}