从java中的csv文件读取时跳过行 [英] skipping lines while reading from csv file in java

问题描述

private static List<Book> readDataFromCSV(String fileName) {    
    List<Book> books = new ArrayList<>();
    Path pathToFile = Paths.get(fileName);

    // create an instance of BufferedReader
    // using try with resource, Java 7 feature to close resources
    try (BufferedReader br = Files.newBufferedReader(pathToFile,
            StandardCharsets.US_ASCII)) {
        // read the first line from the text file
        String line = br.readLine();

        // loop until all lines are read
        while ((line  = br.readLine())!= null) {
            // use string.split to load a string array with the values from
            // each line of
            // the file, using a comma as the delimiter
            String[] attributes = line.split("\\|");

            Book book = createBook(attributes);

            // adding book into ArrayList
            books.add(book);

            // read next line before looping
            // if end of file reached, line would be null
            line = br.readLine();
        }

    } catch (IOException ioe) {
        ioe.printStackTrace();
    } 
    return books;
}


private static Book createBook(String[] metadata) { 
    String name = metadata[0];  
    String author = metadata[1]; // create and return book of this metadata 
    return new Book(name, price, author); 
} 

上面的代码从文本文件(一个csv文件)中每隔第二行跳过一次.它提供备用行的数据，并使用Java 7语法.请提供一些建议或建议，以解决问题.

The above code skips every second line from text file (a csv file). It gives data of alternate lines and it uses Java 7 syntax. Please provide some suggestion what is wrong or how to improve it.

推荐答案

在 while 条件(即

// read the first line from the text file
String line = br.readLine();
// loop until all lines are read
while (line != null)
{
    ...
    // read next line before looping
    // if end of file reached, line would be null
    line = br.readLine();
}

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