问题描述
此测试失败:预期:
@Test
public void testSetTypeOfColumns() throws IOException {
String data = "ID,NAME" + System.lineseparator() + "2,Chris";
InputStream csvStream = new ByteArrayInputStream(data.getBytes());
CsvParser parser = new CsvParser(new CsvParserSettings() {
{
setHeaderExtractionEnabled(true);
}
});
parser.beginParsing(csvStream);
parser.getRecordMetadata().setTypeOfColumns(Integer.class,"ID");
parser.getRecordMetadata().setTypeOfColumns(String.class,"NAME");
Record record = parser.parseNextRecord();
Map<String,Object> map = record.toFieldobjectMap();
assertEquals(Integer.class,map.get("ID").getClass());
}
解决方法
将记录转换为对象值的映射。转换必须是 使用 RecordMetaData.convertFields(Conversion[]) 注册或 RecordMetaData.convertIndexes(Conversion[]) (Conversion[])}。列 没有已知的转换会将它们的值放入地图中 普通字符串。
http://docs.univocity.com/parsers/2.7.2/index.html?com/univocity/parsers/common/record/Record.html
看看他们的教程如何映射到一个简单的 POJO。
https://www.univocity.com/pages/univocity_parsers_tutorial#using-annotations-to-map-your-java-beans
// BeanListProcessor converts each parsed row to an instance of a given class,then stores each instance into a list.
BeanListProcessor<TestBean> rowProcessor = new BeanListProcessor<TestBean>(TestBean.class);
CsvParserSettings parserSettings = new CsvParserSettings();
parserSettings.getFormat().setLineSeparator("\n");
parserSettings.setProcessor(rowProcessor);
parserSettings.setHeaderExtractionEnabled(true);
CsvParser parser = new CsvParser(parserSettings);
parser.parse(getReader("/examples/bean_test.csv"));
// The BeanListProcessor provides a list of objects extracted from the input.
List<TestBean> beans = rowProcessor.getBeans();