Supercsv - 无法找到方法异常

Question

我有以下实现。

csvReader = new CsvBeanReader(new InputStreamReader(stream), CsvPreference.STANDARD_PREFERENCE);
lastReadIdentity =  (T) csvReader.read(Packages.class, Packages.COLS);

在我的 Packages.class 中

我已经设置了我的 unitcount 变量。

public String getUnitCount() {
    return unitCount;
}
public void setUnitCount(String unitCount) {
    this.unitCount = unitCount;
}

当它被当作一个字符串时它工作得很好，但是当它被当作一个整数时，它会抛出下面的异常。请帮忙

private int unitCount;
public int getUnitCount() {
    return unitCount;
}
public void setUnitCount(int unitCount) {
    this.unitCount = unitCount;
}

例外：

org.supercsv.exception.SuperCsvReflectionException: unable to find method setUnitCount(java.lang.String) in class com.directv.sms.data.SubscriberPackages - check that the corresponding nameMapping element matches the field name in the bean, and the cell processor returns a type compatible with the field
context=null
at org.supercsv.util.ReflectionUtils.findSetter(ReflectionUtils.java:139)
at org.supercsv.util.MethodCache.getSetMethod(MethodCache.java:95)

Answer 1

我不确定 SuperCsv，但 univocity-parsers 应该能够毫不费力地处理这个问题，更不用说解析输入的速度至少快 3 倍。

只需注释你的类：

public class SubscriberPackages {

    @Parsed(defaultNullRead = "0") // if the file contains nulls, then they will be converted to 0.
    private int unitCount;   // The attribute name will be matched against the column header in the file automatically.
}

将 CSV 解析为 bean：

// BeanListProcessor converts each parsed row to an instance of a given class, then stores each instance into a list.
BeanListProcessor<SubscriberPackages> rowProcessor = new BeanListProcessor<SubscriberPackages>(SubscriberPackages.class);

CsvParserSettings parserSettings = new CsvParserSettings(); //many options here, check the tutorial.
parserSettings.setRowProcessor(rowProcessor); //uses the bean processor to handle your input rows
parserSettings.setHeaderExtractionEnabled(true); // extracts header names from the input file.

CsvParser parser = new CsvParser(parserSettings); //creates a parser with your settings.
parser.parse(new FileReader(new File("/path/to/file.csv"))); //all rows parsed here go straight to the bean processor

// The BeanListProcessor provides a list of objects extracted from the input.
List<SubscriberPackages> beans = rowProcessor.getBeans();

披露：我是这个库的作者。它是开源免费的（Apache V2.0 许可）。