java - 从 csv 文件打印特定行

Question

我有一个 csv 文件，如下所示:

ID、价格、描述、长度、高度、类别

随后的每一列都填写了相关数据。我有一个读取器类，它读取此数据并将其显示在单独的演示类中(通过实例化它)。这是我读取 csv 文件的方式:

 public CatalogueReader(String filename) throws FileNotFoundException {
    this.filename = filename;
    this.catalogue = new Catalogue();

    Scanner csvFile;
    try {
        csvFile = new Scanner(new File(filename));
    } catch (FileNotFoundException fnf) {
        throw new FileNotFoundException("File has not been found!!!! Probably in wrong place!");
    }
    csvFile.useDelimiter("\n");
    boolean first = true;
    String productCode;
    double price;
    String description;
    double weight;
    int rating;
    String category;
    boolean ageRestriction;
    String rows;
    while (csvFile.hasNextLine()) {
        rows = csvFile.nextLine();
        if (first) {
            first = false;
            continue;
        }
        System.out.println(rows);
        String[] fields = rows.split(",");
        productCode = (fields[0].trim());
        price = Double.parseDouble(fields[1].trim());
        description = fields[2].trim();
        weight = Double.parseDouble(fields[3].trim());
        rating = Integer.parseInt(fields[4].trim());
        category = fields[5].trim();
        ageRestriction = Boolean.parseBoolean(fields[6].trim());
        catalogue.addAProduct(new Item(productCode, price, description, weight, rating, category, ageRestriction));
        //System.out.println("PC is " + productCode);
    }
    csvFile.close();
}

我的问题是，有没有一种方法可以根据特定 ID 打印出特定行？

任何指导将不胜感激。

Answer 1

通过在方法中传递值，您可以逐行检查该值是否打破了循环。

public void CatalogueReader(String filename,String id) throws IOException{
            BufferedReader br = null;
            String line = "";
            String cvsSplitBy = ",";

                br = new BufferedReader(new FileReader(filename));
                while ((line = br.readLine()) != null) {

                    // use comma as separator
                String[] lineArray = line.split(cvsSplitBy);
                //Check the value from array
                //if(lineArray[xxx]==id){
                //Print the line
                          break;
                }



               if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
              }

            }