csvReader正在从csv文件读取时跳过第一列每一行的第一个字母

Question

I wrote a csvReader method in Java. Everything seems to work fine, but it is just skipping the very first alphabet of every row in first column while printing the values. Here is my code =>

public static void csvReader(String fileName) {

    try {
        BufferedReader fileReader = new BufferedReader(new FileReader(fileName));
        List<Student> students = new ArrayList<>();
        fileReader.readLine();

        while (fileReader.read() > 0) {
            String line = fileReader.readLine();
            String[] tokens = line.split(COMMA_DELIMETER);

            if (tokens.length > 0) {
                Student student = new Student(tokens[0], tokens[1], Integer.valueOf(tokens[2]),
                        Integer.valueOf(tokens[3]));
                students.add(student);
            }
        }

        students.forEach(System.out::println);

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

Here "Student" is just a POJO class having firstName, lastName, id and age fields. In am getting the output as =>

Student details : ID = 101 first name = ikhil Last name = Chaurasia age = 28
Student details : ID = 102 first name = adhna Last name = Chaurasia age = 28

Where the result should be like =>

Student details : ID = 101 first name = Nikhil Last name = Chaurasia age = 28
Student details : ID = 102 first name = Sadhna Last name = Chaurasia age = 28

The csv file content are shown below :

The toString method is implemented as shown below :

public String toString() {
    return "Student details : ID = "+id+ " first name = "+firstName+ " Last name = "+lastName+ " age = "+age;
}

Any help would be highly appreciated. Thanks

Answer 1

The issue is in your while loop condition: fileReader.read() > 0 .

This reads a single character every time you call it (such as 'N', 'S'), which causes the subsequent call to readLine to skip the first character.

Instead, just check the condition using readLine :

String line;
while ((line = fileReader.readLine()) != null) {
  String[] tokens = line.split(COMMA_DELIMETER);
  // do the rest of the stuff
}