java - 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 标题生成的这个 pojo 类和 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。因为如果我改变csv 文件然后我必须更改我的代码，以便它应该动态映射到任何文件。例如

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

我想将它映射到我已经拥有的 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();

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