java - 如何在文件没有“.csv”扩展名的java中计算csv文件中的行数？

Question

我想获取文件类似于“csv”但没有“.csv”文件扩展名的文件行数。我只有文件名。

我在这里提到的代码是只计算名称为 abc.txt 或 abc.csv 的文件的文件行数的函数，但如果扩展名没有 .txt 或.csv。也就是说，如果文件名只是“abc”而不是“abc.csv”，则代码将不是文件

这是完整的程序： 分为三类

package file_count_checker;
import java.util.Scanner;
public class File_Count_Checker {
    public static void main(String[] args) {
    //String s = "C:\\Users\\Nitish.kumar\\Desktop\\Automation\\Input";  
    String path;
    System.out.println("Enter the folder Path : ");
    Scanner in1 = new Scanner(System.in);
    path = in1.nextLine();    
    FileTester ftMain = new FileTester();
    ftMain.printFileList(path);         
        }
}

//------------
//Class2:
package file_count_checker;
import java.io.File;
import java.util.*;

public class FileTester {
    // FileTester ft = new FileTester();
    Map<String, List<String>> map = new HashMap();
    FileLineCounter flc = new FileLineCounter();
     boolean isFound; boolean isFoundTxt;
    public void fileChecker(String folderPath) {
        File f = new File(folderPath);
        File[] listOfFiles = f.listFiles();

        for (File file : listOfFiles) {
            if (file.isFile()) {
                String path = file.getParent();

                if (map.get(path) == null) {
                    List<String> fileList = new ArrayList<>();
                    map.put(path, fileList);                
                }
                List<String> fileList = map.get(path);
                fileList.add(file.getName());
            } else if (file.isDirectory()) {
                String s2 = file.getPath();
                fileChecker(s2);
            }
        }
    }

        public void printFileList(String path){
        fileChecker(path);
        for(Map.Entry<String, List<String>> entry : map.entrySet()){
            System.out.println("");
            System.out.println("Folder Name : "+entry.getKey());
            for(String file : entry.getValue()){               
//Below code to check whether file is CSV, TXT or with other extension                
                isFound = file.contains(".csv");                                             
                isFoundTxt = file.contains(".txt");
                System.out.println("  File Name : "+file);
                if(isFound != true){  
                    if(file.contains(".txt") !=true){
                System.out.println("    Invalid file: unable to read " );}
                }
                else {
                flc.startCount(entry.getKey()+"\\"+file);      }
                if(isFoundTxt != true ) {  } 
                else { 
                flc.startCount(entry.getKey()+"\\"+file);
                     }  

            }
        }

    }
}

//Class 3--------------

package file_count_checker;
import java.io.File;
import java.io.LineNumberReader;
import java.io.FileReader;
import java.io.IOException;
public class FileLineCounter {
    int totalLines = 0;     
    public void startCount(String filePath){
        try {
             File file =new File(filePath);
             FileReader fr = new FileReader(file);
             LineNumberReader lnr = new LineNumberReader(fr);                   
                int linenumber = 0;             
                    while (lnr.readLine() != null){
                    linenumber++;
                    }        
                    System.out.println("    Total number of lines : " + linenumber);
                    System.out.println("    Size: "+getFileSizeKiloBytes(file));
                    lnr.close();
    }  //close of try block 
        //Below function to check file size
        //File file = new File();

     catch (IOException e){
         System.out.println("Issues with the file at location:"+ filePath);
                }

    }
     private static String getFileSizeKiloBytes(File file) {
        return (double) file.length() / 1024 + "  kb";
    }
//close of main methods
}

Answer 1

如果您想要单线，可以使用readAllLines method。

Files.readAllLines(java.nio.file.Path).size()

否则您可能想查看this question。