OpenCSV:将嵌套的Bean映射到CSV文件 [英] OpenCSV: Mapping a Nested Bean to a CSV file

问题描述

我正在尝试将一个bean映射到CSV文件，但是我的bean具有其他嵌套bean作为属性的问题.发生的事情是OpenCSV遍历属性找到一个bean，然后将其放入并映射该bean内部的所有数据，如果找到另一个bean，它将继续运行.如何使用OpenCSV处理嵌套的bean?如何确保它能从嵌套bean映射正确的属性?

I am trying to map a bean to a CSV file but the problem that my bean has other nested beans as attributes. What happens is that OpenCSV goes through the attributes finds a bean then goes into it and maps all the data inside of that bean and if it finds another bean it goes on and on. How can I deal withe nested beans using OpenCSV? How can I ensure that it maps the correct attributes from the nested beans?

推荐答案

在OpenCSV 5.0中，我们可以通过@CsvRecurse注释映射嵌套的bean，而无需使用MappingStrategy.

In OpenCSV 5.0, we can map nested bean by @CsvRecurse annotation without using MappingStrategy.

将映射从输入/输出列拆分到成员的能力 多个嵌入式Bean的变量已通过 注释@CsvRecurse.仍然需要一个root bean.

The ability to split mappings from input/output columns to member variables of multiple embedded beans has been added through the annotation @CsvRecurse. One root bean is still necessary.

Csv文件

id,cardNumber,holder
1,1234567 890,abc

根豆

public class DataSet {

    @CsvBindByName
    private String id;

    @CsvRecurse
    private MyNumber myNumber;

    //getter and setter
}

巢豆

public class MyNumber {

    @CsvBindByName
    private String cardNumber;

    @CsvBindByName
    private String holder;

    // getter and setter
}

读豆子

  public static void main(String[] args) throws IOException {
        BufferedReader reader = Files.newBufferedReader(Paths.get("path-to-csv-file.csv"));
        List<DataSet> beans = new CsvToBeanBuilder<DataSet>(reader).withType(DataSet.class).build().parse();
    }

引用: http://opencsv.sourceforge.net/#multivaluedmap_based_bean_fields_many_to_one_mappings

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