如何将 .csv 文件中的一行插入到 Person[] 人员对象中

Question

所以我有一个 Person 类和一个 biostats.csv 文件，我想将其导入到 person[] 数组中。 我怎样才能做到这一点？ 我想让每一行都是一行，所以一个 Person 对象数组将是 Alex 和他的详细信息，第二个 Person 对象数组将是 Bert 和他的详细信息等......提前谢谢

public Person() {}

public int getAge() {
    return age;
}
public void setAge(int age) {
    this.age = age;
}

public double getHeight() {
    return height;
}
public void setHeight(double height) {
    this.height = height;
}
public double getWeight() {
    return weight;
}
public void setWeight(double weight) {
    this.weight = weight;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getGender() {
    return gender;
}
public void setGender(String gender) {
    this.gender = gender;
}

这是我所拥有的，但我认为这是完全错误的

public static void buildFromFile(String location) throws FileNotFoundException{

    File file = new File(location);
    Scanner input = new Scanner(file);

    while(input.hasNextLine()) {
        String data = input.nextLine();
        for(int i = 0; i <= people.length; i++) {
            people[i].setName(data);
        }
    }
    for(int i = 0; i <= people.length; i++) {
        System.out.println(people[i]);
    }

Answer 1

类Files提供面向行的函数。

整个回合循环如下：

Path path = Paths.get(location);
List<String> lines = Files.readAllLines(path); // Load all from file.

List<Person> persons = new ArrayList<>();
for (String line : lines) {
    ...
    persons.add(person);
}


List<String> lines = new ArrayList<>();
for (Person person : persons) {
    ...
    lines.add(line);
}

Files.write(path, lines); // Store all to file.

Answer 2

使用apache commons csv你可以做这样的事情：

public static Person[] buildFromFile(File file) throws IOException {
    List<Person> persons = new ArrayList<>();
    try (InputStream stream = new FileInputStream(file);
            Reader in = new InputStreamReader(stream, "UTF-8")) {
        CSVFormat format = CSVFormat.EXCEL.withDelimiter(';');
        Iterable<CSVRecord> records = format.parse(in);
        for (CSVRecord record: records) {
            persons.add(recordToPerson(record));
        }
    }
    return persons.toArray(new Person[persons.size()]);
}

private static Person recordToPerson(CSVRecord record) {
    Person person = new Person();
    person.setName(record.get(0));
    person.setGender(record.get(1));
    person.setAge(Integer.parseInt(record.get(2)));
    person.setHeight(Double.parseDouble(record.get(3)));
    person.setWeight(Double.parseDouble(record.get(4)));
    return person;
}