將新文件保存到任何目錄Groovy

Question

我一直收到文件或目錄不存在。我在創建Spring應用程序上下文的Groovy腳本中運行。我很容易使用相同類型的路徑在不同的文件中讀取數據。但是，我正在閱讀的文件位於Spring的類路徑中。這個腳本可能由不同文件系統的許多人運行，所以我不能硬編碼路徑。我需要一個相對路徑。

這是在課堂上面，但重要的信息。

private static String saveFilesToLocation = "/retrieve/"; 

這是代碼。

CSVReader reader = new CSVReader(new InputStreamReader(balanceFile), SEPARATOR) 
    String[] nextLine 
    int counter = 0; 
    while ((nextLine = reader.readNext()) != null) { 
     counter++ 
     if (nextLine != null && (nextLine[0] != 'FileLocation')) { 
      counter++; 
      try { 

       //Remove 0, only if client number start with "0". 
       String fileLocation = nextLine[0]; 

       byte[] fileBytes = documentFileService.getFile(fileLocation); 
       if (fileBytes != null) { 
        String fileName = fileLocation.substring(fileLocation.indexOf("/") + 1, fileLocation.length()); 
        File file = new File(saveFilesToLocation+fileLocation); 
        file.withOutputStream { 
         it.write fileBytes 
        } 

        println "$counter) Wrote file ${fileLocation} to ${saveFilesToLocation+fileLocation}" 
       } else { 
        println "$counter) UNABLE TO RETRIEVE FILE: $fileLocation"; 
       } 

      } catch (Exception e) { 
       e.printStackTrace() 
      } 
     } 
    } 

字符串中的路徑有我期望的，沒有額外的字符。

UPDATE：

感謝loteq你的回答將工作太，並擁有比我們那個工作最終的結果更好grooviness。由於它是一種一次性的，我們沒有時間去改變你有更好的版本。

下面是我們工作的代碼，除了saveFilesToLocation被設置爲現在已存在的目錄之外，它與上面的代碼完全相同。之前的那個不存在，我們需要調用mkdir，如建議的loteq 。

private static String saveFilesToLocation = "/tmp/retrieve/"; 


    CSVReader reader = new CSVReader(new InputStreamReader(balanceFile), SEPARATOR) 
    String[] nextLine 
    int counter = 0; 
    while ((nextLine = reader.readNext()) != null) { 
     if (nextLine != null && (nextLine[0] != 'FileLocation')) { 
      counter++; 
      try { 

       //Remove 0, only if client number start with "0". 
       String fileLocation = nextLine[0]; 

       byte[] fileBytes = documentFileService.getFile(fileLocation); 
       if (fileBytes != null) { 
        String fileName = fileLocation.substring(fileLocation.indexOf("/") + 1, fileLocation.length()); 
        File file = new File(saveFilesToLocation+fileName); 
        file.withOutputStream { 
         it.write fileBytes 
        } 

        println "$counter) Wrote file ${fileLocation} to ${saveFilesToLocation+fileLocation}" 
       } else { 
        println "$counter) UNABLE TO RETRIEVE FILE: $fileLocation"; 
       } 

      } catch (Exception e) { 
       e.printStackTrace() 
      } 
     } else { 
      counter++; 
     } 
    } 

Answer 1

似乎有東西添加在您的代碼中，但我不能確定它是一個錯誤。

您計算一個文件名並不真正用它來創建目標文件。相反，您只需將原始路徑附加到前綴saveFilesToLocation：

   String fileName = fileLocation.substring(fileLocation.indexOf("/") + 1, fileLocation.length()); 
       File file = new File(saveFilesToLocation+fileLocation); 

這似乎很奇怪。

然後，如果fileLocation包含需要創建的目錄，那麼你需要mkdirs（）它們，否則你會得到一個錯誤。

我會給你2個片段，其中一個假設你的上面的代碼是越野車，另一個是你以更安全的方式在慣用的常規中做的事情。

首先讓與實際文件的工作對象，而不是如果字符串：即假設在上面的代碼中的錯誤

private static File saveFilesToLocationDir = saveFilesToLocation as File 

版本：

private static String saveFilesToLocation = "/retrieve/"; 

private static File saveFilesToLocationDir = saveFilesToLocation as File 

CSVReader reader = new CSVReader(new InputStreamReader(balanceFile), SEPARATOR) 
String[] nextLine 
int counter = 0; 
while ((nextLine = reader.readNext()) != null) { 
    counter++ 
    if (nextLine != null && (nextLine[0] != 'FileLocation')) { 
     counter++; 
     try { 

      //Remove 0, only if client number start with "0". 
      String fileLocation = nextLine[0]; 

      byte[] fileBytes = documentFileService.getFile(fileLocation); 
      if (fileBytes != null) { 

       int firstSlash = fileLocation.indexOf("/") + 1 
       String fileName = fileLocation[firstSlash..-1] 

       File destination = new File(saveFilesToLocationDir, fileName) 
       destination.parentFile.mkdirs() 

       destination.withOutputStream { it << fileBytes } 

       println "$counter) Wrote file ${fileLocation} to ${destination.absolutePath}" 
      } else { 
       println "$counter) UNABLE TO RETRIEVE FILE: $fileLocation"; 
      } 

     } catch (Exception e) { 
      e.printStackTrace() 
     } 
    } 
} 

版本不使用生成的文件名（如你）：

private static String saveFilesToLocation = "/retrieve/"; 

private static File saveFilesToLocationDir = saveFilesToLocation as File 

CSVReader reader = new CSVReader(new InputStreamReader(balanceFile), SEPARATOR) 
String[] nextLine 
int counter = 0; 
while ((nextLine = reader.readNext()) != null) { 
    counter++ 
    if (nextLine != null && (nextLine[0] != 'FileLocation')) { 
     counter++; 
     try { 

      //Remove 0, only if client number start with "0". 
      String fileLocation = nextLine[0]; 

      byte[] fileBytes = documentFileService.getFile(fileLocation); 
      if (fileBytes != null) { 

       int firstSlash = fileLocation.indexOf("/") + 1 
       String fileName = fileLocation[firstSlash..-1] 

       File destination = new File(saveFilesToLocationDir, fileLocation) 
       destination.parentFile.mkdirs() 

       destination.withOutputStream { it << fileBytes } 

       println "$counter) Wrote file ${fileLocation} to ${destination.absolutePath}" 
      } else { 
       println "$counter) UNABLE TO RETRIEVE FILE: $fileLocation"; 
      } 

     } catch (Exception e) { 
      e.printStackTrace() 
     } 
    } 
}