Java-如何从zip文件中的CSV文件获取行数

Question

我在特定位置有多个zip文件。 每个Zip文件中都包含1个CSV文件。我尝试下面的代码读取每个zip文件并获取zip内的CSV计数，最后，我正在打印每个文件的行总和。代码正在执行，没有错误，但是打印的最终值无效。任何帮助将不胜感激。

File1.csv-位于File1.Zip中

File2.csv-位于File2.Zip中

public static void main(String[] args)
    {

        String archivePath = "C:\\Users\\Documents\\";
        String FileName ="";
        LineNumberReader reader = null;
        long totalLines = 0;


        try (DirectoryStream<Path> dir = Files.newDirectoryStream(Paths.get(archivePath), "*.zip"))
        {

            for (Path entry : dir)
            {

                Path sourceCsvFileName = entry.getFileName();
                FileName = sourceCsvFileName.toString();
                //  System.out.println(" File name: "+ FileName);   // prints FileName Eg: File1.zip , File2.zip



                // Below logic to Read number of lines for each iterated CSV which is inside zip file  (NOTE: Stop reading on encountering empty row)


                reader = new LineNumberReader(new FileReader(new File(archivePath + FileName)));
                while ((reader.readLine()) != null);

                totalLines = totalLines  + reader.getLineNumber();





                reader.close();

            }

            System.out.println("Total sum of rows from all files-> " + totalLines);   // expected o/p (5+2):  7  actual o/p : 13

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

    }

Answer 1

您将需要使用ZipFile / ZipEntry类读取zip中的文件。 以下代码应满足您的要求：

try (DirectoryStream<Path> dir = Files.newDirectoryStream(Paths.get(archivePath), "*.zip")) {
       for (Path entry : dir) {
          ZipFile zipFile =  new ZipFile(entry.getFileName().toString());
          Enumeration<? extends ZipEntry> entries = zipFile.entries();
          while(entries.hasMoreElements()){
               ZipEntry zipEntry = entries.nextElement();
               reader = new BufferedReader(new InputStreamReader(zipFile.getInputStream(zipEntry),"UTF-8"));
               while ((reader.readLine()) != null) {
                        totalLines++;
               }          
          }
          reader.close();
       }
       System.out.println("Total sum of rows from all files-> " + totalLines);   // expected o/p (5+2):  7  actual o/p : 13
} catch (Exception e) { e.printStackTrace(); }