Question

我正在尝试使用OpenCSV将一些数据写入CSV文件。但是，当我尝试存储数据时，我会得到CsvBeanIntrospectionException，然后是NoSuchMethodException: Unknown property 'Email' on class 'class SubscriberBean'。

这是我的JavaBean类的代码：

import com.opencsv.bean.CsvBindByName;

import java.io.Serializable;

public class SubscriberBean implements Serializable {

@CsvBindByName
String Email;

@CsvBindByName
String Name;

public SubscriberBean() {}

public SubscriberBean(String email, String name) {
    this.Email = email;
    this.Name = name;
}

public String getName() {
    return Name;
}

public void setName(String name) {
    Name = name;
}

public String getEmail() {
    return Email;
}

public void setEmail(String email) {
    Email = email;
}

@Override
public String toString() {
    return "SubscriberBean [" + "Email=" + Email + ", Name=" + Name + ']';
}

public Boolean isEmpty() {
    return (this.Name.equals("") || this.Email.equals("") || this.Name == null || this.Email == null);
}

以及我如何尝试在我的csv文件中存储数据的代码：

List<SubscriberBean>  lsb = new ArrayList<SubscriberBean>();
.
.
.

    try {
        Writer writer = new FileWriter("test.csv");
        StatefulBeanToCsv beanToCsv = new StatefulBeanToCsvBuilder(writer).build();

        beanToCsv.write(lsb);
        writer.close();
    } catch (CsvDataTypeMismatchException e) {
        e.printStackTrace();
    } catch (CsvRequiredFieldEmptyException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

我检查了JavaBean类，看起来很好。 CSV代码与opencsv网站上提供的示例几乎相同。

Answer 1

几乎在那里;）

apache beanutils期望您的字段以小写字母开头。例如。 email，而非Email等。这是固定的SubscriberBean：

public class SubscriberBean implements Serializable {

    @CsvBindByName
    String email;

    @CsvBindByName
    String name;

    public SubscriberBean() {
    }

    public SubscriberBean(String email, String name) {
        this.email = email;
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    // ...

}

请注意，由于小写字段，我不得不稍微更改setter。我添加了this引用：this.email = email;

Answer 2

由于吸气剂和吸气剂，我也有同样的例外。还应该定义它们

无法使用OpenCSV将JavaBeans写入CSV

2 个答案: