I am using following code:
CsvSchema bootstrap = CsvSchema.emptySchema().withHeader(); ObjectMapper mapper = new CsvMapper(); File csvFile = new File("input.csv"); // or from String, URL etc Object user = mapper.reader(?).withSchema(bootstrap).readValue(new File("data.csv")); mapper.writeValue(new File("data.json"), user);
It throws an error in my IDE saying cannot find symbol method withSchema(CsvSchema) but why? I have used the code from some examples.
I don't know what to write into mapper.reader() as I want to convert any CSV file.
How can I convert any CSV file to JSON and save it to the disk?
What to do next? The examples
I think, you should use MappingIterator to solve your problem. See below example:
import java.io.File; import java.io.IOException; import java.util.List; import java.util.Map; import com.fasterxml.jackson.databind.MappingIterator; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.dataformat.csv.CsvMapper; import com.fasterxml.jackson.dataformat.csv.CsvSchema; public class JacksonProgram { public static void main(String[] args) throws Exception { File input = new File("/x/data.csv"); File output = new File("/x/data.json"); List<Map<?, ?>> data = readObjectsFromCsv(input); writeAsJson(data, output); } public static List<Map<?, ?>> readObjectsFromCsv(File file) throws IOException { CsvSchema bootstrap = CsvSchema.emptySchema().withHeader(); CsvMapper csvMapper = new CsvMapper(); MappingIterator<Map<?, ?>> mappingIterator = csvMapper.reader(Map.class).with(bootstrap).readValues(file); return mappingIterator.readAll(); } public static void writeAsJson(List<Map<?, ?>> data, File file) throws IOException { ObjectMapper mapper = new ObjectMapper(); mapper.writeValue(file, data); } }
See this page: jackson-dataformat-csv for more information and examples.
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