如何将csv文件映射到java中的pojo类

Question

我正在使用java maven插件。我想在pojo类中获取employee.csv文件记录。我从employee.csv标头生成这个pojo类，并且pojo类的所有字段都是字符串类型。现在我想将employee.csv映射到生成的pojo类。我的要求是我不想手动指定列名。因为如果我更改csv 文件，然后我必须再次修改我的代码，以便它应该动态地映射到任何文件。例如

firstName,lastName,title,salary 
john,karter,manager,54372

我想将其映射到我已经有的 pojo

public class Employee
{
  private String firstName;
  private String lastName;
  .
  .
  //getters and setters 
  //toString()
} 

Answer 1

uniVocity-parsers允许您轻松映射您的 pojo。

class Employee {

    @Trim
    @LowerCase
    @Parsed
    private String firstName;

    @Parsed
    private String lastName;

    @NullString(nulls = { "?", "-" }) // if the value parsed in the quantity column is "?" or "-", it will be replaced by null.
    @Parsed(defaultNullRead = "0") // if a value resolves to null, it will be converted to the String "0".
    private Integer salary; // The attribute name will be matched against the column header in the file automatically.
    ...

}

解析：

BeanListProcessor<Employee> rowProcessor = new BeanListProcessor<Employee>(Employee.class);

CsvParserSettings parserSettings = new CsvParserSettings();
parserSettings.setRowProcessor(rowProcessor);
parserSettings.setHeaderExtractionEnabled(true);

CsvParser parser = new CsvParser(parserSettings);

//And parse!
//this submits all rows parsed from the input to the BeanListProcessor
parser.parse(new FileReader(new File("/path/to/your.csv"))); 

List<Employee> beans = rowProcessor.getBeans();

披露：我是这个库的作者。它是开源且免费的（Apache V2.0 许可证）。