如何使用fileinputstream从另一个类访问输入文件?

mrwjdhj3  于 2021-07-03  发布在  Java
关注(0)|答案(2)|浏览(410)

以下是两个java类:
要获取输入文件:

public class Inputfile {    

public static void main(String[] args) throws Exception  {
    Scanner sc = new Scanner(System.in);
    Scanner input = null;
    boolean isFile = false;
    while (isFile == false){   
        System.out.print("Input file name? ");
        String fileName = sc.next();

        File inputFile = new File(fileName);
        if (inputFile.exists()){
            input = new Scanner(inputFile);
            isFile = true;
        }            
    }

要分析输入文件:

public class PdfParse {

public static void main(final String[] args) throws Exception  {

Inputfile inputfile = new Inputfile();
 String fileName;
 fileName =  inputfile.toString();      
  FileInputStream inputstream = new FileInputStream(new File("fileName"));

ParseContext pcontext = new ParseContext();
  .........   
  }

我得到的只是filenotfound文件名的异常。我尝试使用字符串名称,但无法使用getter从inputfile类获取字符串名称,但失败了。有人能告诉我怎么做吗?
非常感谢。

h43kikqp

h43kikqp1#

你可以定义你的 getFileName 方法 Inputfile

public class Inputfile {    

      public static String getFileName() throws Exception  {
        Scanner sc = new Scanner(System.in);
        String fileName = null;
        boolean isFile = false;
        while (!isFile){   
            System.out.print("Input file name? ");
            fileName = sc.next();

            File inputFile = new File(fileName);
            if (inputFile.exists()){
                isFile = true;
            }            
        } 
        return fileName;
    }
}

然后您可以在中使用上面定义的方法 main 方法 PdfParse

public class PdfParse {

      public static void main(final String[] args) throws Exception  {

        String fileName = InputFile.getFileName();

        FileInputStream inputstream = new FileInputStream(new File(fileName));

         ParseContext pcontext = new ParseContext();
         .........   
      } 
  }

希望这有帮助。

2fjabf4q

2fjabf4q2#

您可以将文件传递给第二个类:

Scanner sc = new Scanner(System.in);
File inputFile = null;
while (inputFile == null){   
    System.out.print("Input file name? ");
    String fileName = sc.next();

    inputFile = new File(fileName);
    if (!inputFile.exists()){
        inputFile = null;
    }            
}

PdfParse.parse(input); // <-- Pass file to parser

然后你的 PdfParse 类可以如下所示:

public class PdfParse {

    public static void parse(File inputFile) throws Exception {
        FileInputStream inputstream = new FileInputStream(inputFile);
        ...
    }

}

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